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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "src/tracing/core/tracing_service_impl.h"
#include "perfetto/base/build_config.h"
#include "perfetto/tracing/core/forward_decls.h"
#include <errno.h>
#include <limits.h>
#include <string.h>
#include <cinttypes>
#include <regex>
#include <unordered_set>
#if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN) && \
!PERFETTO_BUILDFLAG(PERFETTO_OS_NACL)
#include <sys/uio.h>
#include <sys/utsname.h>
#include <unistd.h>
#endif
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID) && \
PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
#include "src/android_internal/lazy_library_loader.h" // nogncheck
#include "src/android_internal/tracing_service_proxy.h" // nogncheck
#endif
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID) || \
PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX) || \
PERFETTO_BUILDFLAG(PERFETTO_OS_APPLE)
#define PERFETTO_HAS_CHMOD
#include <sys/stat.h>
#endif
#include <algorithm>
#include "perfetto/base/build_config.h"
#include "perfetto/base/status.h"
#include "perfetto/base/task_runner.h"
#include "perfetto/ext/base/android_utils.h"
#include "perfetto/ext/base/file_utils.h"
#include "perfetto/ext/base/metatrace.h"
#include "perfetto/ext/base/string_utils.h"
#include "perfetto/ext/base/temp_file.h"
#include "perfetto/ext/base/utils.h"
#include "perfetto/ext/base/uuid.h"
#include "perfetto/ext/base/version.h"
#include "perfetto/ext/base/watchdog.h"
#include "perfetto/ext/tracing/core/basic_types.h"
#include "perfetto/ext/tracing/core/consumer.h"
#include "perfetto/ext/tracing/core/observable_events.h"
#include "perfetto/ext/tracing/core/producer.h"
#include "perfetto/ext/tracing/core/shared_memory.h"
#include "perfetto/ext/tracing/core/shared_memory_abi.h"
#include "perfetto/ext/tracing/core/trace_packet.h"
#include "perfetto/ext/tracing/core/trace_writer.h"
#include "perfetto/protozero/scattered_heap_buffer.h"
#include "perfetto/protozero/static_buffer.h"
#include "perfetto/tracing/core/data_source_descriptor.h"
#include "perfetto/tracing/core/tracing_service_capabilities.h"
#include "perfetto/tracing/core/tracing_service_state.h"
#include "src/android_stats/statsd_logging_helper.h"
#include "src/protozero/filtering/message_filter.h"
#include "src/tracing/core/packet_stream_validator.h"
#include "src/tracing/core/shared_memory_arbiter_impl.h"
#include "src/tracing/core/trace_buffer.h"
#include "protos/perfetto/common/builtin_clock.gen.h"
#include "protos/perfetto/common/builtin_clock.pbzero.h"
#include "protos/perfetto/common/trace_stats.pbzero.h"
#include "protos/perfetto/config/trace_config.pbzero.h"
#include "protos/perfetto/trace/clock_snapshot.pbzero.h"
#include "protos/perfetto/trace/perfetto/tracing_service_event.pbzero.h"
#include "protos/perfetto/trace/system_info.pbzero.h"
#include "protos/perfetto/trace/trace_packet.pbzero.h"
#include "protos/perfetto/trace/trace_uuid.pbzero.h"
#include "protos/perfetto/trace/trigger.pbzero.h"
// General note: this class must assume that Producers are malicious and will
// try to crash / exploit this class. We can trust pointers because they come
// from the IPC layer, but we should never assume that that the producer calls
// come in the right order or their arguments are sane / within bounds.
// This is a macro because we want the call-site line number for the ELOG.
#define PERFETTO_SVC_ERR(...) \
(PERFETTO_ELOG(__VA_ARGS__), ::perfetto::base::ErrStatus(__VA_ARGS__))
namespace perfetto {
namespace {
constexpr int kMaxBuffersPerConsumer = 128;
constexpr uint32_t kDefaultSnapshotsIntervalMs = 10 * 1000;
constexpr int kDefaultWriteIntoFilePeriodMs = 5000;
constexpr int kMaxConcurrentTracingSessions = 15;
constexpr int kMaxConcurrentTracingSessionsPerUid = 5;
constexpr int kMaxConcurrentTracingSessionsForStatsdUid = 10;
constexpr int64_t kMinSecondsBetweenTracesGuardrail = 5 * 60;
constexpr uint32_t kMillisPerHour = 3600000;
constexpr uint32_t kMillisPerDay = kMillisPerHour * 24;
constexpr uint32_t kMaxTracingDurationMillis = 7 * 24 * kMillisPerHour;
// These apply only if enable_extra_guardrails is true.
constexpr uint32_t kGuardrailsMaxTracingBufferSizeKb = 128 * 1024;
constexpr uint32_t kGuardrailsMaxTracingDurationMillis = 24 * kMillisPerHour;
#if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN) || PERFETTO_BUILDFLAG(PERFETTO_OS_NACL)
struct iovec {
void* iov_base; // Address
size_t iov_len; // Block size
};
// Simple implementation of writev. Note that this does not give the atomicity
// guarantees of a real writev, but we don't depend on these (we aren't writing
// to the same file from another thread).
ssize_t writev(int fd, const struct iovec* iov, int iovcnt) {
ssize_t total_size = 0;
for (int i = 0; i < iovcnt; ++i) {
ssize_t current_size = base::WriteAll(fd, iov[i].iov_base, iov[i].iov_len);
if (current_size != static_cast<ssize_t>(iov[i].iov_len))
return -1;
total_size += current_size;
}
return total_size;
}
#define IOV_MAX 1024 // Linux compatible limit.
#endif // PERFETTO_BUILDFLAG(PERFETTO_OS_WIN) ||
// PERFETTO_BUILDFLAG(PERFETTO_OS_NACL)
// Partially encodes a CommitDataRequest in an int32 for the purposes of
// metatracing. Note that it encodes only the bottom 10 bits of the producer id
// (which is technically 16 bits wide).
//
// Format (by bit range):
// [ 31 ][ 30 ][ 29:20 ][ 19:10 ][ 9:0]
// [unused][has flush id][num chunks to patch][num chunks to move][producer id]
static int32_t EncodeCommitDataRequest(ProducerID producer_id,
const CommitDataRequest& req_untrusted) {
uint32_t cmov = static_cast<uint32_t>(req_untrusted.chunks_to_move_size());
uint32_t cpatch = static_cast<uint32_t>(req_untrusted.chunks_to_patch_size());
uint32_t has_flush_id = req_untrusted.flush_request_id() != 0;
uint32_t mask = (1 << 10) - 1;
uint32_t acc = 0;
acc |= has_flush_id << 30;
acc |= (cpatch & mask) << 20;
acc |= (cmov & mask) << 10;
acc |= (producer_id & mask);
return static_cast<int32_t>(acc);
}
void SerializeAndAppendPacket(std::vector<TracePacket>* packets,
std::vector<uint8_t> packet) {
Slice slice = Slice::Allocate(packet.size());
memcpy(slice.own_data(), packet.data(), packet.size());
packets->emplace_back();
packets->back().AddSlice(std::move(slice));
}
std::tuple<size_t /*shm_size*/, size_t /*page_size*/> EnsureValidShmSizes(
size_t shm_size,
size_t page_size) {
// Theoretically the max page size supported by the ABI is 64KB.
// However, the current implementation of TraceBuffer (the non-shared
// userspace buffer where the service copies data) supports at most
// 32K. Setting 64K "works" from the producer<>consumer viewpoint
// but then causes the data to be discarded when copying it into
// TraceBuffer.
constexpr size_t kMaxPageSize = 32 * 1024;
static_assert(kMaxPageSize <= SharedMemoryABI::kMaxPageSize, "");
if (page_size == 0)
page_size = TracingServiceImpl::kDefaultShmPageSize;
if (shm_size == 0)
shm_size = TracingServiceImpl::kDefaultShmSize;
page_size = std::min<size_t>(page_size, kMaxPageSize);
shm_size = std::min<size_t>(shm_size, TracingServiceImpl::kMaxShmSize);
// The tracing page size has to be multiple of 4K. On some systems (e.g. Mac
// on Arm64) the system page size can be larger (e.g., 16K). That doesn't
// matter here, because the tracing page size is just a logical partitioning
// and does not have any dependencies on kernel mm syscalls (read: it's fine
// to have trace page sizes of 4K on a system where the kernel page size is
// 16K).
bool page_size_is_valid = page_size >= SharedMemoryABI::kMinPageSize;
page_size_is_valid &= page_size % SharedMemoryABI::kMinPageSize == 0;
// Only allow power of two numbers of pages, i.e. 1, 2, 4, 8 pages.
size_t num_pages = page_size / SharedMemoryABI::kMinPageSize;
page_size_is_valid &= (num_pages & (num_pages - 1)) == 0;
if (!page_size_is_valid || shm_size < page_size ||
shm_size % page_size != 0) {
return std::make_tuple(TracingServiceImpl::kDefaultShmSize,
TracingServiceImpl::kDefaultShmPageSize);
}
return std::make_tuple(shm_size, page_size);
}
bool NameMatchesFilter(const std::string& name,
const std::vector<std::string>& name_filter,
const std::vector<std::string>& name_regex_filter) {
bool filter_is_set = !name_filter.empty() || !name_regex_filter.empty();
if (!filter_is_set)
return true;
bool filter_matches = std::find(name_filter.begin(), name_filter.end(),
name) != name_filter.end();
bool filter_regex_matches =
std::find_if(name_regex_filter.begin(), name_regex_filter.end(),
[&](const std::string& regex) {
return std::regex_match(
name, std::regex(regex, std::regex::extended));
}) != name_regex_filter.end();
return filter_matches || filter_regex_matches;
}
// Used when TraceConfig.write_into_file == true and output_path is not empty.
base::ScopedFile CreateTraceFile(const std::string& path, bool overwrite) {
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID) && \
PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD)
// This is NOT trying to preserve any security property, SELinux does that.
// It just improves the actionability of the error when people try to save the
// trace in a location that is not SELinux-allowed (a generic "permission
// denied" vs "don't put it here, put it there").
// These are the only SELinux approved dir for trace files that are created
// directly by traced.
static const char* kTraceDirBasePath = "/data/misc/perfetto-traces/";
if (!base::StartsWith(path, kTraceDirBasePath)) {
PERFETTO_ELOG("Invalid output_path %s. On Android it must be within %s.",
path.c_str(), kTraceDirBasePath);
return base::ScopedFile();
}
#endif
// O_CREAT | O_EXCL will fail if the file exists already.
const int flags = O_RDWR | O_CREAT | (overwrite ? O_TRUNC : O_EXCL);
auto fd = base::OpenFile(path, flags, 0600);
if (fd) {
#if defined(PERFETTO_HAS_CHMOD)
// Passing 0644 directly above won't work because of umask.
PERFETTO_CHECK(fchmod(*fd, 0644) == 0);
#endif
} else {
PERFETTO_PLOG("Failed to create %s", path.c_str());
}
return fd;
}
bool ShouldLogEvent(const TraceConfig& cfg) {
switch (cfg.statsd_logging()) {
case TraceConfig::STATSD_LOGGING_ENABLED:
return true;
case TraceConfig::STATSD_LOGGING_DISABLED:
return false;
case TraceConfig::STATSD_LOGGING_UNSPECIFIED:
break;
}
// For backward compatibility with older versions of perfetto_cmd.
return cfg.enable_extra_guardrails();
}
// Appends `data` (which has `size` bytes), to `*packet`. Splits the data in
// slices no larger than `max_slice_size`.
void AppendOwnedSlicesToPacket(std::unique_ptr<uint8_t[]> data,
size_t size,
size_t max_slice_size,
perfetto::TracePacket* packet) {
if (size <= max_slice_size) {
packet->AddSlice(Slice::TakeOwnership(std::move(data), size));
return;
}
uint8_t* src_ptr = data.get();
for (size_t size_left = size; size_left > 0;) {
const size_t slice_size = std::min(size_left, max_slice_size);
Slice slice = Slice::Allocate(slice_size);
memcpy(slice.own_data(), src_ptr, slice_size);
packet->AddSlice(std::move(slice));
src_ptr += slice_size;
size_left -= slice_size;
}
}
} // namespace
// static
std::unique_ptr<TracingService> TracingService::CreateInstance(
std::unique_ptr<SharedMemory::Factory> shm_factory,
base::TaskRunner* task_runner) {
return std::unique_ptr<TracingService>(
new TracingServiceImpl(std::move(shm_factory), task_runner));
}
TracingServiceImpl::TracingServiceImpl(
std::unique_ptr<SharedMemory::Factory> shm_factory,
base::TaskRunner* task_runner)
: task_runner_(task_runner),
shm_factory_(std::move(shm_factory)),
uid_(base::GetCurrentUserId()),
buffer_ids_(kMaxTraceBufferID),
trigger_probability_rand_(
static_cast<uint32_t>(base::GetWallTimeNs().count())),
weak_ptr_factory_(this) {
PERFETTO_DCHECK(task_runner_);
}
TracingServiceImpl::~TracingServiceImpl() {
// TODO(fmayer): handle teardown of all Producer.
}
std::unique_ptr<TracingService::ProducerEndpoint>
TracingServiceImpl::ConnectProducer(Producer* producer,
uid_t uid,
pid_t pid,
const std::string& producer_name,
size_t shared_memory_size_hint_bytes,
bool in_process,
ProducerSMBScrapingMode smb_scraping_mode,
size_t shared_memory_page_size_hint_bytes,
std::unique_ptr<SharedMemory> shm,
const std::string& sdk_version) {
PERFETTO_DCHECK_THREAD(thread_checker_);
if (lockdown_mode_ && uid != base::GetCurrentUserId()) {
PERFETTO_DLOG("Lockdown mode. Rejecting producer with UID %ld",
static_cast<unsigned long>(uid));
return nullptr;
}
if (producers_.size() >= kMaxProducerID) {
PERFETTO_DFATAL("Too many producers.");
return nullptr;
}
const ProducerID id = GetNextProducerID();
PERFETTO_DLOG("Producer %" PRIu16 " connected, uid=%d", id,
static_cast<int>(uid));
bool smb_scraping_enabled = smb_scraping_enabled_;
switch (smb_scraping_mode) {
case ProducerSMBScrapingMode::kDefault:
break;
case ProducerSMBScrapingMode::kEnabled:
smb_scraping_enabled = true;
break;
case ProducerSMBScrapingMode::kDisabled:
smb_scraping_enabled = false;
break;
}
std::unique_ptr<ProducerEndpointImpl> endpoint(new ProducerEndpointImpl(
id, uid, pid, this, task_runner_, producer, producer_name, sdk_version,
in_process, smb_scraping_enabled));
auto it_and_inserted = producers_.emplace(id, endpoint.get());
PERFETTO_DCHECK(it_and_inserted.second);
endpoint->shmem_size_hint_bytes_ = shared_memory_size_hint_bytes;
endpoint->shmem_page_size_hint_bytes_ = shared_memory_page_size_hint_bytes;
// Producer::OnConnect() should run before Producer::OnTracingSetup(). The
// latter may be posted by SetupSharedMemory() below, so post OnConnect() now.
auto weak_ptr = endpoint->weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_ptr] {
if (weak_ptr)
weak_ptr->producer_->OnConnect();
});
if (shm) {
// The producer supplied an SMB. This is used only by Chrome; in the most
// common cases the SMB is created by the service and passed via
// OnTracingSetup(). Verify that it is correctly sized before we attempt to
// use it. The transport layer has to verify the integrity of the SMB (e.g.
// ensure that the producer can't resize if after the fact).
size_t shm_size, page_size;
std::tie(shm_size, page_size) =
EnsureValidShmSizes(shm->size(), endpoint->shmem_page_size_hint_bytes_);
if (shm_size == shm->size() &&
page_size == endpoint->shmem_page_size_hint_bytes_) {
PERFETTO_DLOG(
"Adopting producer-provided SMB of %zu kB for producer \"%s\"",
shm_size / 1024, endpoint->name_.c_str());
endpoint->SetupSharedMemory(std::move(shm), page_size,
/*provided_by_producer=*/true);
} else {
PERFETTO_LOG(
"Discarding incorrectly sized producer-provided SMB for producer "
"\"%s\", falling back to service-provided SMB. Requested sizes: %zu "
"B total, %zu B page size; suggested corrected sizes: %zu B total, "
"%zu B page size",
endpoint->name_.c_str(), shm->size(),
endpoint->shmem_page_size_hint_bytes_, shm_size, page_size);
shm.reset();
}
}
return std::unique_ptr<ProducerEndpoint>(std::move(endpoint));
}
void TracingServiceImpl::DisconnectProducer(ProducerID id) {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_DLOG("Producer %" PRIu16 " disconnected", id);
PERFETTO_DCHECK(producers_.count(id));
// Scrape remaining chunks for this producer to ensure we don't lose data.
if (auto* producer = GetProducer(id)) {
for (auto& session_id_and_session : tracing_sessions_)
ScrapeSharedMemoryBuffers(&session_id_and_session.second, producer);
}
for (auto it = data_sources_.begin(); it != data_sources_.end();) {
auto next = it;
next++;
if (it->second.producer_id == id)
UnregisterDataSource(id, it->second.descriptor.name());
it = next;
}
producers_.erase(id);
UpdateMemoryGuardrail();
}
TracingServiceImpl::ProducerEndpointImpl* TracingServiceImpl::GetProducer(
ProducerID id) const {
PERFETTO_DCHECK_THREAD(thread_checker_);
auto it = producers_.find(id);
if (it == producers_.end())
return nullptr;
return it->second;
}
std::unique_ptr<TracingService::ConsumerEndpoint>
TracingServiceImpl::ConnectConsumer(Consumer* consumer, uid_t uid) {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_DLOG("Consumer %p connected from UID %" PRIu64,
reinterpret_cast<void*>(consumer), static_cast<uint64_t>(uid));
std::unique_ptr<ConsumerEndpointImpl> endpoint(
new ConsumerEndpointImpl(this, task_runner_, consumer, uid));
auto it_and_inserted = consumers_.emplace(endpoint.get());
PERFETTO_DCHECK(it_and_inserted.second);
// Consumer might go away before we're able to send the connect notification,
// if that is the case just bail out.
auto weak_ptr = endpoint->weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_ptr] {
if (weak_ptr)
weak_ptr->consumer_->OnConnect();
});
return std::unique_ptr<ConsumerEndpoint>(std::move(endpoint));
}
void TracingServiceImpl::DisconnectConsumer(ConsumerEndpointImpl* consumer) {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_DLOG("Consumer %p disconnected", reinterpret_cast<void*>(consumer));
PERFETTO_DCHECK(consumers_.count(consumer));
// TODO(primiano) : Check that this is safe (what happens if there are
// ReadBuffers() calls posted in the meantime? They need to become noop).
if (consumer->tracing_session_id_)
FreeBuffers(consumer->tracing_session_id_); // Will also DisableTracing().
consumers_.erase(consumer);
// At this point no more pointers to |consumer| should be around.
PERFETTO_DCHECK(!std::any_of(
tracing_sessions_.begin(), tracing_sessions_.end(),
[consumer](const std::pair<const TracingSessionID, TracingSession>& kv) {
return kv.second.consumer_maybe_null == consumer;
}));
}
bool TracingServiceImpl::DetachConsumer(ConsumerEndpointImpl* consumer,
const std::string& key) {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_DLOG("Consumer %p detached", reinterpret_cast<void*>(consumer));
PERFETTO_DCHECK(consumers_.count(consumer));
TracingSessionID tsid = consumer->tracing_session_id_;
TracingSession* tracing_session;
if (!tsid || !(tracing_session = GetTracingSession(tsid)))
return false;
if (GetDetachedSession(consumer->uid_, key)) {
PERFETTO_ELOG("Another session has been detached with the same key \"%s\"",
key.c_str());
return false;
}
PERFETTO_DCHECK(tracing_session->consumer_maybe_null == consumer);
tracing_session->consumer_maybe_null = nullptr;
tracing_session->detach_key = key;
consumer->tracing_session_id_ = 0;
return true;
}
bool TracingServiceImpl::AttachConsumer(ConsumerEndpointImpl* consumer,
const std::string& key) {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_DLOG("Consumer %p attaching to session %s",
reinterpret_cast<void*>(consumer), key.c_str());
PERFETTO_DCHECK(consumers_.count(consumer));
if (consumer->tracing_session_id_) {
PERFETTO_ELOG(
"Cannot reattach consumer to session %s"
" while it already attached tracing session ID %" PRIu64,
key.c_str(), consumer->tracing_session_id_);
return false;
}
auto* tracing_session = GetDetachedSession(consumer->uid_, key);
if (!tracing_session) {
PERFETTO_ELOG(
"Failed to attach consumer, session '%s' not found for uid %d",
key.c_str(), static_cast<int>(consumer->uid_));
return false;
}
consumer->tracing_session_id_ = tracing_session->id;
tracing_session->consumer_maybe_null = consumer;
tracing_session->detach_key.clear();
return true;
}
base::Status TracingServiceImpl::EnableTracing(ConsumerEndpointImpl* consumer,
const TraceConfig& cfg,
base::ScopedFile fd) {
PERFETTO_DCHECK_THREAD(thread_checker_);
// If the producer is specifying a UUID, respect that (at least for the first
// snapshot). Otherwise generate a new UUID.
base::Uuid uuid(cfg.trace_uuid_lsb(), cfg.trace_uuid_msb());
if (!uuid)
uuid = base::Uuidv4();
PERFETTO_DLOG("Enabling tracing for consumer %p, UUID: %s",
reinterpret_cast<void*>(consumer),
uuid.ToPrettyString().c_str());
MaybeLogUploadEvent(cfg, uuid, PerfettoStatsdAtom::kTracedEnableTracing);
if (cfg.lockdown_mode() == TraceConfig::LOCKDOWN_SET)
lockdown_mode_ = true;
if (cfg.lockdown_mode() == TraceConfig::LOCKDOWN_CLEAR)
lockdown_mode_ = false;
// Scope |tracing_session| to this block to prevent accidental use of a null
// pointer later in this function.
{
TracingSession* tracing_session =
GetTracingSession(consumer->tracing_session_id_);
if (tracing_session) {
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingExistingTraceSession);
return PERFETTO_SVC_ERR(
"A Consumer is trying to EnableTracing() but another tracing "
"session is already active (forgot a call to FreeBuffers() ?)");
}
}
const uint32_t max_duration_ms = cfg.enable_extra_guardrails()
? kGuardrailsMaxTracingDurationMillis
: kMaxTracingDurationMillis;
if (cfg.duration_ms() > max_duration_ms) {
MaybeLogUploadEvent(cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingTooLongTrace);
return PERFETTO_SVC_ERR("Requested too long trace (%" PRIu32
"ms > %" PRIu32 " ms)",
cfg.duration_ms(), max_duration_ms);
}
const bool has_trigger_config = cfg.trigger_config().trigger_mode() !=
TraceConfig::TriggerConfig::UNSPECIFIED;
if (has_trigger_config &&
(cfg.trigger_config().trigger_timeout_ms() == 0 ||
cfg.trigger_config().trigger_timeout_ms() > max_duration_ms)) {
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingInvalidTriggerTimeout);
return PERFETTO_SVC_ERR(
"Traces with START_TRACING triggers must provide a positive "
"trigger_timeout_ms < 7 days (received %" PRIu32 "ms)",
cfg.trigger_config().trigger_timeout_ms());
}
// This check has been introduced in May 2023 after finding b/274931668.
if (static_cast<int>(cfg.trigger_config().trigger_mode()) >
TraceConfig::TriggerConfig::TriggerMode_MAX) {
MaybeLogUploadEvent(
cfg, uuid, PerfettoStatsdAtom::kTracedEnableTracingInvalidTriggerMode);
return PERFETTO_SVC_ERR(
"The trace config specified an invalid trigger_mode");
}
if (has_trigger_config && cfg.duration_ms() != 0) {
MaybeLogUploadEvent(
cfg, uuid, PerfettoStatsdAtom::kTracedEnableTracingDurationWithTrigger);
return PERFETTO_SVC_ERR(
"duration_ms was set, this must not be set for traces with triggers.");
}
if (cfg.trigger_config().trigger_mode() ==
TraceConfig::TriggerConfig::STOP_TRACING &&
cfg.write_into_file()) {
// We don't support this usecase because there are subtle assumptions which
// break around TracingServiceEvents and windowed sorting (i.e. if we don't
// drain the events in ReadBuffersIntoFile because we are waiting for
// STOP_TRACING, we can end up queueing up a lot of TracingServiceEvents and
// emitting them wildy out of order breaking windowed sorting in trace
// processor).
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingStopTracingWriteIntoFile);
return PERFETTO_SVC_ERR(
"Specifying trigger mode STOP_TRACING and write_into_file together is "
"unsupported");
}
std::unordered_set<std::string> triggers;
for (const auto& trigger : cfg.trigger_config().triggers()) {
if (!triggers.insert(trigger.name()).second) {
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingDuplicateTriggerName);
return PERFETTO_SVC_ERR("Duplicate trigger name: %s",
trigger.name().c_str());
}
}
if (cfg.enable_extra_guardrails()) {
if (cfg.deferred_start()) {
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingInvalidDeferredStart);
return PERFETTO_SVC_ERR(
"deferred_start=true is not supported in unsupervised traces");
}
uint64_t buf_size_sum = 0;
for (const auto& buf : cfg.buffers()) {
if (buf.size_kb() % 4 != 0) {
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingInvalidBufferSize);
return PERFETTO_SVC_ERR(
"buffers.size_kb must be a multiple of 4, got %" PRIu32,
buf.size_kb());
}
buf_size_sum += buf.size_kb();
}
uint32_t max_tracing_buffer_size_kb =
std::max(kGuardrailsMaxTracingBufferSizeKb,
cfg.guardrail_overrides().max_tracing_buffer_size_kb());
if (buf_size_sum > max_tracing_buffer_size_kb) {
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingBufferSizeTooLarge);
return PERFETTO_SVC_ERR("Requested too large trace buffer (%" PRIu64
"kB > %" PRIu32 " kB)",
buf_size_sum, max_tracing_buffer_size_kb);
}
}
if (cfg.buffers_size() > kMaxBuffersPerConsumer) {
MaybeLogUploadEvent(cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingTooManyBuffers);
return PERFETTO_SVC_ERR("Too many buffers configured (%d)",
cfg.buffers_size());
}
// Check that the config specifies all buffers for its data sources. This
// is also checked in SetupDataSource, but it is simpler to return a proper
// error to the consumer from here (and there will be less state to undo).
for (const TraceConfig::DataSource& cfg_data_source : cfg.data_sources()) {
size_t num_buffers = static_cast<size_t>(cfg.buffers_size());
size_t target_buffer = cfg_data_source.config().target_buffer();
if (target_buffer >= num_buffers) {
MaybeLogUploadEvent(
cfg, uuid, PerfettoStatsdAtom::kTracedEnableTracingOobTargetBuffer);
return PERFETTO_SVC_ERR(
"Data source \"%s\" specified an out of bounds target_buffer (%zu >= "
"%zu)",
cfg_data_source.config().name().c_str(), target_buffer, num_buffers);
}
}
if (!cfg.unique_session_name().empty()) {
const std::string& name = cfg.unique_session_name();
for (auto& kv : tracing_sessions_) {
if (kv.second.state == TracingSession::CLONED_READ_ONLY)
continue; // Don't consider cloned sessions in uniqueness checks.
if (kv.second.config.unique_session_name() == name) {
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingDuplicateSessionName);
static const char fmt[] =
"A trace with this unique session name (%s) already exists";
// This happens frequently, don't make it an "E"LOG.
PERFETTO_LOG(fmt, name.c_str());
return base::ErrStatus(fmt, name.c_str());
}
}
}
if (cfg.enable_extra_guardrails()) {
// unique_session_name can be empty
const std::string& name = cfg.unique_session_name();
int64_t now_s = base::GetBootTimeS().count();
// Remove any entries where the time limit has passed so this map doesn't
// grow indefinitely:
std::map<std::string, int64_t>& sessions = session_to_last_trace_s_;
for (auto it = sessions.cbegin(); it != sessions.cend();) {
if (now_s - it->second > kMinSecondsBetweenTracesGuardrail) {
it = sessions.erase(it);
} else {
++it;
}
}
int64_t& previous_s = session_to_last_trace_s_[name];
if (previous_s == 0) {
previous_s = now_s;
} else {
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingSessionNameTooRecent);
return PERFETTO_SVC_ERR(
"A trace with unique session name \"%s\" began less than %" PRId64
"s ago (%" PRId64 "s)",
name.c_str(), kMinSecondsBetweenTracesGuardrail, now_s - previous_s);
}
}
const int sessions_for_uid = static_cast<int>(std::count_if(
tracing_sessions_.begin(), tracing_sessions_.end(),
[consumer](const decltype(tracing_sessions_)::value_type& s) {
return s.second.consumer_uid == consumer->uid_;
}));
int per_uid_limit = kMaxConcurrentTracingSessionsPerUid;
if (consumer->uid_ == 1066 /* AID_STATSD*/) {
per_uid_limit = kMaxConcurrentTracingSessionsForStatsdUid;
}
if (sessions_for_uid >= per_uid_limit) {
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingTooManySessionsForUid);
return PERFETTO_SVC_ERR(
"Too many concurrent tracing sesions (%d) for uid %d limit is %d",
sessions_for_uid, static_cast<int>(consumer->uid_), per_uid_limit);
}
// TODO(primiano): This is a workaround to prevent that a producer gets stuck
// in a state where it stalls by design by having more TraceWriterImpl
// instances than free pages in the buffer. This is really a bug in
// trace_probes and the way it handles stalls in the shmem buffer.
if (tracing_sessions_.size() >= kMaxConcurrentTracingSessions) {
MaybeLogUploadEvent(
cfg, uuid,
PerfettoStatsdAtom::kTracedEnableTracingTooManyConcurrentSessions);
return PERFETTO_SVC_ERR("Too many concurrent tracing sesions (%zu)",
tracing_sessions_.size());
}
// If the trace config provides a filter bytecode, setup the filter now.
// If the filter loading fails, abort the tracing session rather than running
// unfiltered.
std::unique_ptr<protozero::MessageFilter> trace_filter;
if (cfg.has_trace_filter()) {
const auto& filt = cfg.trace_filter();
const std::string& bytecode = filt.bytecode();
trace_filter.reset(new protozero::MessageFilter());
if (!trace_filter->LoadFilterBytecode(bytecode.data(), bytecode.size())) {
MaybeLogUploadEvent(
cfg, uuid, PerfettoStatsdAtom::kTracedEnableTracingInvalidFilter);
return PERFETTO_SVC_ERR("Trace filter bytecode invalid, aborting");
}
// The filter is created using perfetto.protos.Trace as root message
// (because that makes it possible to play around with the `proto_filter`
// tool on actual traces). Here in the service, however, we deal with
// perfetto.protos.TracePacket(s), which are one level down (Trace.packet).
// The IPC client (or the write_into_filte logic in here) are responsible
// for pre-pending the packet preamble (See GetProtoPreamble() calls), but
// the preamble is not there at ReadBuffer time. Hence we change the root of
// the filtering to start at the Trace.packet level.
uint32_t packet_field_id = TracePacket::kPacketFieldNumber;
if (!trace_filter->SetFilterRoot(&packet_field_id, 1)) {
MaybeLogUploadEvent(
cfg, uuid, PerfettoStatsdAtom::kTracedEnableTracingInvalidFilter);
return PERFETTO_SVC_ERR("Failed to set filter root.");
}
}
const TracingSessionID tsid = ++last_tracing_session_id_;
TracingSession* tracing_session =
&tracing_sessions_
.emplace(std::piecewise_construct, std::forward_as_tuple(tsid),
std::forward_as_tuple(tsid, consumer, cfg, task_runner_))
.first->second;
tracing_session->trace_uuid = uuid;
if (trace_filter)
tracing_session->trace_filter = std::move(trace_filter);
if (cfg.write_into_file()) {
if (!fd ^ !cfg.output_path().empty()) {
MaybeLogUploadEvent(
tracing_session->config, uuid,
PerfettoStatsdAtom::kTracedEnableTracingInvalidFdOutputFile);
tracing_sessions_.erase(tsid);
return PERFETTO_SVC_ERR(
"When write_into_file==true either a FD needs to be passed or "
"output_path must be populated (but not both)");
}
if (!cfg.output_path().empty()) {
fd = CreateTraceFile(cfg.output_path(), /*overwrite=*/false);
if (!fd) {
MaybeLogUploadEvent(
tracing_session->config, uuid,
PerfettoStatsdAtom::kTracedEnableTracingFailedToCreateFile);
tracing_sessions_.erase(tsid);
return PERFETTO_SVC_ERR("Failed to create the trace file %s",
cfg.output_path().c_str());
}
}
tracing_session->write_into_file = std::move(fd);
uint32_t write_period_ms = cfg.file_write_period_ms();
if (write_period_ms == 0)
write_period_ms = kDefaultWriteIntoFilePeriodMs;
if (write_period_ms < min_write_period_ms_)
write_period_ms = min_write_period_ms_;
tracing_session->write_period_ms = write_period_ms;
tracing_session->max_file_size_bytes = cfg.max_file_size_bytes();
tracing_session->bytes_written_into_file = 0;
}
// Initialize the log buffers.
bool did_allocate_all_buffers = true;
bool invalid_buffer_config = false;
// Allocate the trace buffers. Also create a map to translate a consumer
// relative index (TraceConfig.DataSourceConfig.target_buffer) into the
// corresponding BufferID, which is a global ID namespace for the service and
// all producers.
size_t total_buf_size_kb = 0;
const size_t num_buffers = static_cast<size_t>(cfg.buffers_size());
tracing_session->buffers_index.reserve(num_buffers);
for (size_t i = 0; i < num_buffers; i++) {
const TraceConfig::BufferConfig& buffer_cfg = cfg.buffers()[i];
BufferID global_id = buffer_ids_.Allocate();
if (!global_id) {
did_allocate_all_buffers = false; // We ran out of IDs.
break;
}
tracing_session->buffers_index.push_back(global_id);
// TraceBuffer size is limited to 32-bit.
const uint32_t buf_size_kb = buffer_cfg.size_kb();
const uint64_t buf_size_bytes = buf_size_kb * static_cast<uint64_t>(1024);
const size_t buf_size = static_cast<size_t>(buf_size_bytes);
if (buf_size_bytes == 0 ||
buf_size_bytes > std::numeric_limits<uint32_t>::max() ||
buf_size != buf_size_bytes) {
invalid_buffer_config = true;
did_allocate_all_buffers = false;
break;
}
total_buf_size_kb += buf_size_kb;
TraceBuffer::OverwritePolicy policy =
buffer_cfg.fill_policy() == TraceConfig::BufferConfig::DISCARD
? TraceBuffer::kDiscard
: TraceBuffer::kOverwrite;
auto it_and_inserted =
buffers_.emplace(global_id, TraceBuffer::Create(buf_size, policy));
PERFETTO_DCHECK(it_and_inserted.second); // buffers_.count(global_id) == 0.
std::unique_ptr<TraceBuffer>& trace_buffer = it_and_inserted.first->second;
if (!trace_buffer) {
did_allocate_all_buffers = false;
break;
}
}
// This can happen if either:
// - All the kMaxTraceBufferID slots are taken.
// - OOM, or, more realistically, we exhausted virtual memory.
// - The buffer size in the config is invalid.
// In any case, free all the previously allocated buffers and abort.
if (!did_allocate_all_buffers) {
for (BufferID global_id : tracing_session->buffers_index) {
buffer_ids_.Free(global_id);
buffers_.erase(global_id);
}
MaybeLogUploadEvent(tracing_session->config, uuid,
PerfettoStatsdAtom::kTracedEnableTracingOom);
tracing_sessions_.erase(tsid);
if (invalid_buffer_config) {
return PERFETTO_SVC_ERR(
"Failed to allocate tracing buffers: Invalid buffer sizes");
}
return PERFETTO_SVC_ERR(
"Failed to allocate tracing buffers: OOM or too many buffers");
}
UpdateMemoryGuardrail();
consumer->tracing_session_id_ = tsid;
// Setup the data sources on the producers without starting them.
for (const TraceConfig::DataSource& cfg_data_source : cfg.data_sources()) {
// Scan all the registered data sources with a matching name.
auto range = data_sources_.equal_range(cfg_data_source.config().name());
for (auto it = range.first; it != range.second; it++) {
TraceConfig::ProducerConfig producer_config;
for (auto& config : cfg.producers()) {
if (GetProducer(it->second.producer_id)->name_ ==
config.producer_name()) {
producer_config = config;
break;
}
}
SetupDataSource(cfg_data_source, producer_config, it->second,
tracing_session);
}
}
bool has_start_trigger = false;
auto weak_this = weak_ptr_factory_.GetWeakPtr();
switch (cfg.trigger_config().trigger_mode()) {
case TraceConfig::TriggerConfig::UNSPECIFIED:
// no triggers are specified so this isn't a trace that is using triggers.
PERFETTO_DCHECK(!has_trigger_config);
break;
case TraceConfig::TriggerConfig::START_TRACING:
// For traces which use START_TRACE triggers we need to ensure that the
// tracing session will be cleaned up when it times out.
has_start_trigger = true;
task_runner_->PostDelayedTask(
[weak_this, tsid]() {
if (weak_this)
weak_this->OnStartTriggersTimeout(tsid);
},
cfg.trigger_config().trigger_timeout_ms());
break;
case TraceConfig::TriggerConfig::STOP_TRACING:
// Update the tracing_session's duration_ms to ensure that if no trigger
// is received the session will end and be cleaned up equal to the
// timeout.
//
// TODO(nuskos): Refactor this so that rather then modifying the config we
// have a field we look at on the tracing_session.
tracing_session->config.set_duration_ms(
cfg.trigger_config().trigger_timeout_ms());
break;
// The case of unknown modes (coming from future versions of the service)
// is handled few lines above (search for TriggerMode_MAX).
}
tracing_session->state = TracingSession::CONFIGURED;
PERFETTO_LOG(
"Configured tracing session %" PRIu64
", #sources:%zu, duration:%d ms%s, #buffers:%d, total "
"buffer size:%zu KB, total sessions:%zu, uid:%d session name: \"%s\"",
tsid, cfg.data_sources().size(), tracing_session->config.duration_ms(),
tracing_session->config.prefer_suspend_clock_for_duration()
? " (suspend_clock)"
: "",
cfg.buffers_size(), total_buf_size_kb, tracing_sessions_.size(),
static_cast<unsigned int>(consumer->uid_),
cfg.unique_session_name().c_str());
// Start the data sources, unless this is a case of early setup + fast
// triggering, either through TraceConfig.deferred_start or
// TraceConfig.trigger_config(). If both are specified which ever one occurs
// first will initiate the trace.
if (!cfg.deferred_start() && !has_start_trigger)
return StartTracing(tsid);
return base::OkStatus();
}
void TracingServiceImpl::ChangeTraceConfig(ConsumerEndpointImpl* consumer,
const TraceConfig& updated_cfg) {
PERFETTO_DCHECK_THREAD(thread_checker_);
TracingSession* tracing_session =
GetTracingSession(consumer->tracing_session_id_);
PERFETTO_DCHECK(tracing_session);
if ((tracing_session->state != TracingSession::STARTED) &&
(tracing_session->state != TracingSession::CONFIGURED)) {
PERFETTO_ELOG(
"ChangeTraceConfig() was called for a tracing session which isn't "
"running.");
return;
}
// We only support updating producer_name_{,regex}_filter (and pass-through
// configs) for now; null out any changeable fields and make sure the rest are
// identical.
TraceConfig new_config_copy(updated_cfg);
for (auto& ds_cfg : *new_config_copy.mutable_data_sources()) {
ds_cfg.clear_producer_name_filter();
ds_cfg.clear_producer_name_regex_filter();
}
TraceConfig current_config_copy(tracing_session->config);
for (auto& ds_cfg : *current_config_copy.mutable_data_sources()) {
ds_cfg.clear_producer_name_filter();
ds_cfg.clear_producer_name_regex_filter();
}
if (new_config_copy != current_config_copy) {
PERFETTO_LOG(
"ChangeTraceConfig() was called with a config containing unsupported "
"changes; only adding to the producer_name_{,regex}_filter is "
"currently supported and will have an effect.");
}
for (TraceConfig::DataSource& cfg_data_source :
*tracing_session->config.mutable_data_sources()) {
// Find the updated producer_filter in the new config.
std::vector<std::string> new_producer_name_filter;
std::vector<std::string> new_producer_name_regex_filter;
bool found_data_source = false;
for (const auto& it : updated_cfg.data_sources()) {
if (cfg_data_source.config().name() == it.config().name()) {
new_producer_name_filter = it.producer_name_filter();
new_producer_name_regex_filter = it.producer_name_regex_filter();
found_data_source = true;
break;
}
}
// Bail out if data source not present in the new config.
if (!found_data_source) {
PERFETTO_ELOG(
"ChangeTraceConfig() called without a current data source also "
"present in the new config: %s",
cfg_data_source.config().name().c_str());
continue;
}
// TODO(oysteine): Just replacing the filter means that if
// there are any filter entries which were present in the original config,
// but removed from the config passed to ChangeTraceConfig, any matching
// producers will keep producing but newly added producers after this
// point will never start.
*cfg_data_source.mutable_producer_name_filter() = new_producer_name_filter;
*cfg_data_source.mutable_producer_name_regex_filter() =
new_producer_name_regex_filter;
// Scan all the registered data sources with a matching name.
auto range = data_sources_.equal_range(cfg_data_source.config().name());
for (auto it = range.first; it != range.second; it++) {
ProducerEndpointImpl* producer = GetProducer(it->second.producer_id);
PERFETTO_DCHECK(producer);
// Check if the producer name of this data source is present
// in the name filters. We currently only support new filters, not
// removing old ones.
if (!NameMatchesFilter(producer->name_, new_producer_name_filter,
new_producer_name_regex_filter)) {
continue;
}
bool already_setup = false;
auto& ds_instances = tracing_session->data_source_instances;
for (auto instance_it = ds_instances.begin();
instance_it != ds_instances.end(); ++instance_it) {
if (instance_it->first == it->second.producer_id &&
instance_it->second.data_source_name ==
cfg_data_source.config().name()) {
already_setup = true;
break;
}
}
if (already_setup)
continue;
// If it wasn't previously setup, set it up now.
// (The per-producer config is optional).
TraceConfig::ProducerConfig producer_config;
for (auto& config : tracing_session->config.producers()) {
if (producer->name_ == config.producer_name()) {
producer_config = config;
break;
}
}
DataSourceInstance* ds_inst = SetupDataSource(
cfg_data_source, producer_config, it->second, tracing_session);
if (ds_inst && tracing_session->state == TracingSession::STARTED)
StartDataSourceInstance(producer, tracing_session, ds_inst);
}
}
}
base::Status TracingServiceImpl::StartTracing(TracingSessionID tsid) {
PERFETTO_DCHECK_THREAD(thread_checker_);
auto weak_this = weak_ptr_factory_.GetWeakPtr();
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session) {
return PERFETTO_SVC_ERR(
"StartTracing() failed, invalid session ID %" PRIu64, tsid);
}
MaybeLogUploadEvent(tracing_session->config, tracing_session->trace_uuid,
PerfettoStatsdAtom::kTracedStartTracing);
if (tracing_session->state != TracingSession::CONFIGURED) {
MaybeLogUploadEvent(
tracing_session->config, tracing_session->trace_uuid,
PerfettoStatsdAtom::kTracedStartTracingInvalidSessionState);
return PERFETTO_SVC_ERR("StartTracing() failed, invalid session state: %d",
tracing_session->state);
}
tracing_session->state = TracingSession::STARTED;
// We store the start of trace snapshot separately as it's important to make
// sure we can interpret all the data in the trace and storing it in the ring
// buffer means it could be overwritten by a later snapshot.
if (!tracing_session->config.builtin_data_sources()
.disable_clock_snapshotting()) {
SnapshotClocks(&tracing_session->initial_clock_snapshot);
}
// We don't snapshot the clocks here because we just did this above.
SnapshotLifecyleEvent(
tracing_session,
protos::pbzero::TracingServiceEvent::kTracingStartedFieldNumber,
false /* snapshot_clocks */);
// Periodically snapshot clocks, stats, sync markers while the trace is
// active. The snapshots are emitted on the future ReadBuffers() calls, which
// means that:
// (a) If we're streaming to a file (or to a consumer) while tracing, we
// write snapshots periodically into the trace.
// (b) If ReadBuffers() is only called after tracing ends, we emit the latest
// snapshot into the trace. For clock snapshots, we keep track of the
// snapshot recorded at the beginning of the session
// (initial_clock_snapshot above), as well as the most recent sampled
// snapshots that showed significant new drift between different clocks.
// The latter clock snapshots are sampled periodically and at lifecycle
// events.
base::PeriodicTask::Args snapshot_task_args;
snapshot_task_args.start_first_task_immediately = true;
snapshot_task_args.use_suspend_aware_timer =
tracing_session->config.builtin_data_sources()
.prefer_suspend_clock_for_snapshot();
snapshot_task_args.task = [weak_this, tsid] {
if (weak_this)
weak_this->PeriodicSnapshotTask(tsid);
};
snapshot_task_args.period_ms =
tracing_session->config.builtin_data_sources().snapshot_interval_ms();
if (!snapshot_task_args.period_ms)
snapshot_task_args.period_ms = kDefaultSnapshotsIntervalMs;
tracing_session->snapshot_periodic_task.Start(snapshot_task_args);
// Trigger delayed task if the trace is time limited.
const uint32_t trace_duration_ms = tracing_session->config.duration_ms();
if (trace_duration_ms > 0) {
auto stop_task =
std::bind(&TracingServiceImpl::StopOnDurationMsExpiry, weak_this, tsid);
if (tracing_session->config.prefer_suspend_clock_for_duration()) {
base::PeriodicTask::Args stop_args;
stop_args.use_suspend_aware_timer = true;
stop_args.period_ms = trace_duration_ms;
stop_args.one_shot = true;
stop_args.task = std::move(stop_task);
tracing_session->timed_stop_task.Start(stop_args);
} else {
task_runner_->PostDelayedTask(std::move(stop_task), trace_duration_ms);
}
} // if (trace_duration_ms > 0).
// Start the periodic drain tasks if we should to save the trace into a file.
if (tracing_session->config.write_into_file()) {
task_runner_->PostDelayedTask(
[weak_this, tsid] {
if (weak_this)
weak_this->ReadBuffersIntoFile(tsid);
},
tracing_session->delay_to_next_write_period_ms());
}
// Start the periodic flush tasks if the config specified a flush period.
if (tracing_session->config.flush_period_ms())
PeriodicFlushTask(tsid, /*post_next_only=*/true);
// Start the periodic incremental state clear tasks if the config specified a
// period.
if (tracing_session->config.incremental_state_config().clear_period_ms()) {
PeriodicClearIncrementalStateTask(tsid, /*post_next_only=*/true);
}
for (auto& kv : tracing_session->data_source_instances) {
ProducerID producer_id = kv.first;
DataSourceInstance& data_source = kv.second;
ProducerEndpointImpl* producer = GetProducer(producer_id);
if (!producer) {
PERFETTO_DFATAL("Producer does not exist.");
continue;
}
StartDataSourceInstance(producer, tracing_session, &data_source);
}
MaybeNotifyAllDataSourcesStarted(tracing_session);
return base::OkStatus();
}
// static
void TracingServiceImpl::StopOnDurationMsExpiry(
base::WeakPtr<TracingServiceImpl> weak_this,
TracingSessionID tsid) {
// Skip entirely the flush if the trace session doesn't exist anymore.
// This is to prevent misleading error messages to be logged.
if (!weak_this)
return;
auto* tracing_session_ptr = weak_this->GetTracingSession(tsid);
if (!tracing_session_ptr)
return;
// If this trace was using STOP_TRACING triggers and we've seen
// one, then the trigger overrides the normal timeout. In this
// case we just return and let the other task clean up this trace.
if (tracing_session_ptr->config.trigger_config().trigger_mode() ==
TraceConfig::TriggerConfig::STOP_TRACING &&
!tracing_session_ptr->received_triggers.empty())
return;
// In all other cases (START_TRACING or no triggers) we flush
// after |trace_duration_ms| unconditionally.
weak_this->FlushAndDisableTracing(tsid);
}
void TracingServiceImpl::StartDataSourceInstance(
ProducerEndpointImpl* producer,
TracingSession* tracing_session,
TracingServiceImpl::DataSourceInstance* instance) {
PERFETTO_DCHECK(instance->state == DataSourceInstance::CONFIGURED);
if (instance->will_notify_on_start) {
instance->state = DataSourceInstance::STARTING;
} else {
instance->state = DataSourceInstance::STARTED;
}
if (tracing_session->consumer_maybe_null) {
tracing_session->consumer_maybe_null->OnDataSourceInstanceStateChange(
*producer, *instance);
}
producer->StartDataSource(instance->instance_id, instance->config);
// If all data sources are started, notify the consumer.
if (instance->state == DataSourceInstance::STARTED)
MaybeNotifyAllDataSourcesStarted(tracing_session);
}
// DisableTracing just stops the data sources but doesn't free up any buffer.
// This is to allow the consumer to freeze the buffers (by stopping the trace)
// and then drain the buffers. The actual teardown of the TracingSession happens
// in FreeBuffers().
void TracingServiceImpl::DisableTracing(TracingSessionID tsid,
bool disable_immediately) {
PERFETTO_DCHECK_THREAD(thread_checker_);
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session) {
// Can happen if the consumer calls this before EnableTracing() or after
// FreeBuffers().
PERFETTO_DLOG("DisableTracing() failed, invalid session ID %" PRIu64, tsid);
return;
}
MaybeLogUploadEvent(tracing_session->config, tracing_session->trace_uuid,
PerfettoStatsdAtom::kTracedDisableTracing);
switch (tracing_session->state) {
// Spurious call to DisableTracing() while already disabled, nothing to do.
case TracingSession::DISABLED:
PERFETTO_DCHECK(tracing_session->AllDataSourceInstancesStopped());
return;
case TracingSession::CLONED_READ_ONLY:
PERFETTO_DLOG("DisableTracing() cannot be called on a cloned session");
return;
// This is either:
// A) The case of a graceful DisableTracing() call followed by a call to
// FreeBuffers(), iff |disable_immediately| == true. In this case we want
// to forcefully transition in the disabled state without waiting for the
// outstanding acks because the buffers are going to be destroyed soon.
// B) A spurious call, iff |disable_immediately| == false, in which case
// there is nothing to do.
case TracingSession::DISABLING_WAITING_STOP_ACKS:
PERFETTO_DCHECK(!tracing_session->AllDataSourceInstancesStopped());
if (disable_immediately)
DisableTracingNotifyConsumerAndFlushFile(tracing_session);
return;
// Continues below.
case TracingSession::CONFIGURED:
// If the session didn't even start there is no need to orchestrate a
// graceful stop of data sources.
disable_immediately = true;
break;
// This is the nominal case, continues below.
case TracingSession::STARTED:
break;
}
for (auto& data_source_inst : tracing_session->data_source_instances) {
const ProducerID producer_id = data_source_inst.first;
DataSourceInstance& instance = data_source_inst.second;
ProducerEndpointImpl* producer = GetProducer(producer_id);
PERFETTO_DCHECK(producer);
PERFETTO_DCHECK(instance.state == DataSourceInstance::CONFIGURED ||
instance.state == DataSourceInstance::STARTING ||
instance.state == DataSourceInstance::STARTED);
StopDataSourceInstance(producer, tracing_session, &instance,
disable_immediately);
}
// If the periodic task is running, we can stop the periodic snapshot timer
// here instead of waiting until FreeBuffers to prevent useless snapshots
// which won't be read.
tracing_session->snapshot_periodic_task.Reset();
// Either this request is flagged with |disable_immediately| or there are no
// data sources that are requesting a final handshake. In both cases just mark
// the session as disabled immediately, notify the consumer and flush the
// trace file (if used).
if (tracing_session->AllDataSourceInstancesStopped())
return DisableTracingNotifyConsumerAndFlushFile(tracing_session);
tracing_session->state = TracingSession::DISABLING_WAITING_STOP_ACKS;
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostDelayedTask(
[weak_this, tsid] {
if (weak_this)
weak_this->OnDisableTracingTimeout(tsid);
},
tracing_session->data_source_stop_timeout_ms());
// Deliberately NOT removing the session from |tracing_session_|, it's still
// needed to call ReadBuffers(). FreeBuffers() will erase() the session.
}
void TracingServiceImpl::NotifyDataSourceStarted(
ProducerID producer_id,
DataSourceInstanceID instance_id) {
PERFETTO_DCHECK_THREAD(thread_checker_);
for (auto& kv : tracing_sessions_) {
TracingSession& tracing_session = kv.second;
DataSourceInstance* instance =
tracing_session.GetDataSourceInstance(producer_id, instance_id);
if (!instance)
continue;
// If the tracing session was already stopped, ignore this notification.
if (tracing_session.state != TracingSession::STARTED)
continue;
if (instance->state != DataSourceInstance::STARTING) {
PERFETTO_ELOG("Started data source instance in incorrect state: %d",
instance->state);
continue;
}
instance->state = DataSourceInstance::STARTED;
ProducerEndpointImpl* producer = GetProducer(producer_id);
PERFETTO_DCHECK(producer);
if (tracing_session.consumer_maybe_null) {
tracing_session.consumer_maybe_null->OnDataSourceInstanceStateChange(
*producer, *instance);
}
// If all data sources are started, notify the consumer.
MaybeNotifyAllDataSourcesStarted(&tracing_session);
} // for (tracing_session)
}
void TracingServiceImpl::MaybeNotifyAllDataSourcesStarted(
TracingSession* tracing_session) {
if (!tracing_session->consumer_maybe_null)
return;
if (!tracing_session->AllDataSourceInstancesStarted())
return;
// In some rare cases, we can get in this state more than once. Consider the
// following scenario: 3 data sources are registered -> trace starts ->
// all 3 data sources ack -> OnAllDataSourcesStarted() is called.
// Imagine now that a 4th data source registers while the trace is ongoing.
// This would hit the AllDataSourceInstancesStarted() condition again.
// In this case, however, we don't want to re-notify the consumer again.
// That would be unexpected (even if, perhaps, technically correct) and
// trigger bugs in the consumer.
if (tracing_session->did_notify_all_data_source_started)
return;
PERFETTO_DLOG("All data sources started");
SnapshotLifecyleEvent(
tracing_session,
protos::pbzero::TracingServiceEvent::kAllDataSourcesStartedFieldNumber,
true /* snapshot_clocks */);
tracing_session->did_notify_all_data_source_started = true;
tracing_session->consumer_maybe_null->OnAllDataSourcesStarted();
}
void TracingServiceImpl::NotifyDataSourceStopped(
ProducerID producer_id,
DataSourceInstanceID instance_id) {
PERFETTO_DCHECK_THREAD(thread_checker_);
for (auto& kv : tracing_sessions_) {
TracingSession& tracing_session = kv.second;
DataSourceInstance* instance =
tracing_session.GetDataSourceInstance(producer_id, instance_id);
if (!instance)
continue;
if (instance->state != DataSourceInstance::STOPPING) {
PERFETTO_ELOG("Stopped data source instance in incorrect state: %d",
instance->state);
continue;
}
instance->state = DataSourceInstance::STOPPED;
ProducerEndpointImpl* producer = GetProducer(producer_id);
PERFETTO_DCHECK(producer);
if (tracing_session.consumer_maybe_null) {
tracing_session.consumer_maybe_null->OnDataSourceInstanceStateChange(
*producer, *instance);
}
if (!tracing_session.AllDataSourceInstancesStopped())
continue;
if (tracing_session.state != TracingSession::DISABLING_WAITING_STOP_ACKS)
continue;
// All data sources acked the termination.
DisableTracingNotifyConsumerAndFlushFile(&tracing_session);
} // for (tracing_session)
}
void TracingServiceImpl::ActivateTriggers(
ProducerID producer_id,
const std::vector<std::string>& triggers) {
PERFETTO_DCHECK_THREAD(thread_checker_);
auto* producer = GetProducer(producer_id);
PERFETTO_DCHECK(producer);
int64_t now_ns = base::GetBootTimeNs().count();
for (const auto& trigger_name : triggers) {
PERFETTO_DLOG("Received ActivateTriggers request for \"%s\"",
trigger_name.c_str());
base::Hasher hash;
hash.Update(trigger_name.c_str(), trigger_name.size());
std::string triggered_session_name;
base::Uuid triggered_session_uuid;
TracingSessionID triggered_session_id = 0;
int trigger_mode = 0;
uint64_t trigger_name_hash = hash.digest();
size_t count_in_window =
PurgeExpiredAndCountTriggerInWindow(now_ns, trigger_name_hash);
bool trigger_matched = false;
bool trigger_activated = false;
for (auto& id_and_tracing_session : tracing_sessions_) {
auto& tracing_session = id_and_tracing_session.second;
TracingSessionID tsid = id_and_tracing_session.first;
auto iter = std::find_if(
tracing_session.config.trigger_config().triggers().begin(),
tracing_session.config.trigger_config().triggers().end(),
[&trigger_name](const TraceConfig::TriggerConfig::Trigger& trigger) {
return trigger.name() == trigger_name;
});
if (iter == tracing_session.config.trigger_config().triggers().end())
continue;
if (tracing_session.state == TracingSession::CLONED_READ_ONLY)
continue;
// If this trigger requires a certain producer to have sent it
// (non-empty producer_name()) ensure the producer who sent this trigger
// matches.
if (!iter->producer_name_regex().empty() &&
!std::regex_match(
producer->name_,
std::regex(iter->producer_name_regex(), std::regex::extended))) {
continue;
}
// Use a random number between 0 and 1 to check if we should allow this
// trigger through or not.
double trigger_rnd =
trigger_rnd_override_for_testing_ > 0
? trigger_rnd_override_for_testing_
: trigger_probability_dist_(trigger_probability_rand_);
PERFETTO_DCHECK(trigger_rnd >= 0 && trigger_rnd < 1);
if (trigger_rnd < iter->skip_probability()) {
MaybeLogTriggerEvent(tracing_session.config,
PerfettoTriggerAtom::kTracedLimitProbability,
trigger_name);
continue;
}
// If we already triggered more times than the limit, silently ignore
// this trigger.
if (iter->max_per_24_h() > 0 && count_in_window >= iter->max_per_24_h()) {
MaybeLogTriggerEvent(tracing_session.config,
PerfettoTriggerAtom::kTracedLimitMaxPer24h,
trigger_name);
continue;
}
trigger_matched = true;
triggered_session_id = tracing_session.id;
triggered_session_name = tracing_session.config.unique_session_name();
triggered_session_uuid.set_lsb_msb(tracing_session.trace_uuid.lsb(),
tracing_session.trace_uuid.msb());
trigger_mode = static_cast<int>(
tracing_session.config.trigger_config().trigger_mode());
const bool triggers_already_received =
!tracing_session.received_triggers.empty();
tracing_session.received_triggers.push_back(
{static_cast<uint64_t>(now_ns), iter->name(), producer->name_,
producer->uid_});
auto weak_this = weak_ptr_factory_.GetWeakPtr();
switch (tracing_session.config.trigger_config().trigger_mode()) {
case TraceConfig::TriggerConfig::START_TRACING:
// If the session has already been triggered and moved past
// CONFIGURED then we don't need to repeat StartTracing. This would
// work fine (StartTracing would return false) but would add error
// logs.
if (tracing_session.state != TracingSession::CONFIGURED)
break;
trigger_activated = true;
MaybeLogUploadEvent(
tracing_session.config, tracing_session.trace_uuid,
PerfettoStatsdAtom::kTracedTriggerStartTracing, iter->name());
// We override the trace duration to be the trigger's requested
// value, this ensures that the trace will end after this amount
// of time has passed.
tracing_session.config.set_duration_ms(iter->stop_delay_ms());
StartTracing(tsid);
break;
case TraceConfig::TriggerConfig::STOP_TRACING:
// Only stop the trace once to avoid confusing log messages. I.E.
// when we've already hit the first trigger we've already Posted the
// task to FlushAndDisable. So all future triggers will just break
// out.
if (triggers_already_received)
break;
trigger_activated = true;
MaybeLogUploadEvent(
tracing_session.config, tracing_session.trace_uuid,
PerfettoStatsdAtom::kTracedTriggerStopTracing, iter->name());
// Now that we've seen a trigger we need to stop, flush, and disable
// this session after the configured |stop_delay_ms|.
task_runner_->PostDelayedTask(
[weak_this, tsid] {
// Skip entirely the flush if the trace session doesn't exist
// anymore. This is to prevent misleading error messages to be
// logged.
if (weak_this && weak_this->GetTracingSession(tsid))
weak_this->FlushAndDisableTracing(tsid);
},
// If this trigger is zero this will immediately executable and
// will happen shortly.
iter->stop_delay_ms());
break;
case TraceConfig::TriggerConfig::UNSPECIFIED:
PERFETTO_ELOG("Trigger activated but trigger mode unspecified.");
break;
}
} // for (.. : tracing_sessions_)
if (trigger_matched) {
trigger_history_.emplace_back(TriggerHistory{now_ns, trigger_name_hash});
}
if (trigger_activated) {
// Log only the trigger that actually caused a trace stop/start, don't log
// the follow-up ones, even if they matched.
PERFETTO_LOG(
"Trace trigger activated: trigger_name=\"%s\" trigger_mode=%d "
"trace_name=\"%s\" trace_uuid=\"%s\" tsid=%" PRIu64,
trigger_name.c_str(), trigger_mode, triggered_session_name.c_str(),
triggered_session_uuid.ToPrettyString().c_str(),
triggered_session_id);
}
} // for (trigger_name : triggers)
}
// Always invoked TraceConfig.data_source_stop_timeout_ms (by default
// kDataSourceStopTimeoutMs) after DisableTracing(). In nominal conditions all
// data sources should have acked the stop and this will early out.
void TracingServiceImpl::OnDisableTracingTimeout(TracingSessionID tsid) {
PERFETTO_DCHECK_THREAD(thread_checker_);
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session ||
tracing_session->state != TracingSession::DISABLING_WAITING_STOP_ACKS) {
return; // Tracing session was successfully disabled.
}
PERFETTO_ILOG("Timeout while waiting for ACKs for tracing session %" PRIu64,
tsid);
PERFETTO_DCHECK(!tracing_session->AllDataSourceInstancesStopped());
DisableTracingNotifyConsumerAndFlushFile(tracing_session);
}
void TracingServiceImpl::DisableTracingNotifyConsumerAndFlushFile(
TracingSession* tracing_session) {
PERFETTO_DCHECK(tracing_session->state != TracingSession::DISABLED);
for (auto& inst_kv : tracing_session->data_source_instances) {
if (inst_kv.second.state == DataSourceInstance::STOPPED)
continue;
inst_kv.second.state = DataSourceInstance::STOPPED;
ProducerEndpointImpl* producer = GetProducer(inst_kv.first);
PERFETTO_DCHECK(producer);
if (tracing_session->consumer_maybe_null) {
tracing_session->consumer_maybe_null->OnDataSourceInstanceStateChange(
*producer, inst_kv.second);
}
}
tracing_session->state = TracingSession::DISABLED;
// Scrape any remaining chunks that weren't flushed by the producers.
for (auto& producer_id_and_producer : producers_)
ScrapeSharedMemoryBuffers(tracing_session, producer_id_and_producer.second);
SnapshotLifecyleEvent(
tracing_session,
protos::pbzero::TracingServiceEvent::kTracingDisabledFieldNumber,
true /* snapshot_clocks */);
if (tracing_session->write_into_file) {
tracing_session->write_period_ms = 0;
ReadBuffersIntoFile(tracing_session->id);
}
MaybeLogUploadEvent(tracing_session->config, tracing_session->trace_uuid,
PerfettoStatsdAtom::kTracedNotifyTracingDisabled);
if (tracing_session->consumer_maybe_null)
tracing_session->consumer_maybe_null->NotifyOnTracingDisabled("");
}
void TracingServiceImpl::Flush(TracingSessionID tsid,
uint32_t timeout_ms,
ConsumerEndpoint::FlushCallback callback) {
PERFETTO_DCHECK_THREAD(thread_checker_);
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session) {
PERFETTO_DLOG("Flush() failed, invalid session ID %" PRIu64, tsid);
return;
}
if (!timeout_ms)
timeout_ms = tracing_session->flush_timeout_ms();
if (tracing_session->pending_flushes.size() > 1000) {
PERFETTO_ELOG("Too many flushes (%zu) pending for the tracing session",
tracing_session->pending_flushes.size());
callback(false);
return;
}
if (tracing_session->state != TracingSession::STARTED) {
PERFETTO_ELOG("Flush() called, but tracing has not been started");
callback(false);
return;
}
++tracing_session->flushes_requested;
FlushRequestID flush_request_id = ++last_flush_request_id_;
PendingFlush& pending_flush =
tracing_session->pending_flushes
.emplace_hint(tracing_session->pending_flushes.end(),
flush_request_id, PendingFlush(std::move(callback)))
->second;
// Send a flush request to each producer involved in the tracing session. In
// order to issue a flush request we have to build a map of all data source
// instance ids enabled for each producer.
std::map<ProducerID, std::vector<DataSourceInstanceID>> flush_map;
for (const auto& data_source_inst : tracing_session->data_source_instances) {
const ProducerID producer_id = data_source_inst.first;
const DataSourceInstanceID ds_inst_id = data_source_inst.second.instance_id;
flush_map[producer_id].push_back(ds_inst_id);
}
for (const auto& kv : flush_map) {
ProducerID producer_id = kv.first;
ProducerEndpointImpl* producer = GetProducer(producer_id);
const std::vector<DataSourceInstanceID>& data_sources = kv.second;
producer->Flush(flush_request_id, data_sources);
pending_flush.producers.insert(producer_id);
}
// If there are no producers to flush (realistically this happens only in
// some tests) fire OnFlushTimeout() straight away, without waiting.
if (flush_map.empty())
timeout_ms = 0;
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostDelayedTask(
[weak_this, tsid, flush_request_id] {
if (weak_this)
weak_this->OnFlushTimeout(tsid, flush_request_id);
},
timeout_ms);
}
void TracingServiceImpl::NotifyFlushDoneForProducer(
ProducerID producer_id,
FlushRequestID flush_request_id) {
for (auto& kv : tracing_sessions_) {
// Remove all pending flushes <= |flush_request_id| for |producer_id|.
auto& pending_flushes = kv.second.pending_flushes;
auto end_it = pending_flushes.upper_bound(flush_request_id);
for (auto it = pending_flushes.begin(); it != end_it;) {
PendingFlush& pending_flush = it->second;
pending_flush.producers.erase(producer_id);
if (pending_flush.producers.empty()) {
auto weak_this = weak_ptr_factory_.GetWeakPtr();
TracingSessionID tsid = kv.first;
auto callback = std::move(pending_flush.callback);
task_runner_->PostTask([weak_this, tsid, callback]() {
if (weak_this) {
weak_this->CompleteFlush(tsid, std::move(callback),
/*success=*/true);
}
});
it = pending_flushes.erase(it);
} else {
it++;
}
} // for (pending_flushes)
} // for (tracing_session)
}
void TracingServiceImpl::OnFlushTimeout(TracingSessionID tsid,
FlushRequestID flush_request_id) {
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session)
return;
auto it = tracing_session->pending_flushes.find(flush_request_id);
if (it == tracing_session->pending_flushes.end())
return; // Nominal case: flush was completed and acked on time.
// If there were no producers to flush, consider it a success.
bool success = it->second.producers.empty();
auto callback = std::move(it->second.callback);
tracing_session->pending_flushes.erase(it);
CompleteFlush(tsid, std::move(callback), success);
}
void TracingServiceImpl::CompleteFlush(TracingSessionID tsid,
ConsumerEndpoint::FlushCallback callback,
bool success) {
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session) {
callback(false);
return;
}
// Producers may not have been able to flush all their data, even if they
// indicated flush completion. If possible, also collect uncommitted chunks
// to make sure we have everything they wrote so far.
for (auto& producer_id_and_producer : producers_) {
ScrapeSharedMemoryBuffers(tracing_session, producer_id_and_producer.second);
}
SnapshotLifecyleEvent(
tracing_session,
protos::pbzero::TracingServiceEvent::kAllDataSourcesFlushedFieldNumber,
true /* snapshot_clocks */);
tracing_session->flushes_succeeded += success ? 1 : 0;
tracing_session->flushes_failed += success ? 0 : 1;
callback(success);
}
void TracingServiceImpl::ScrapeSharedMemoryBuffers(
TracingSession* tracing_session,
ProducerEndpointImpl* producer) {
if (!producer->smb_scraping_enabled_)
return;
// Can't copy chunks if we don't know about any trace writers.
if (producer->writers_.empty())
return;
// Performance optimization: On flush or session disconnect, this method is
// called for each producer. If the producer doesn't participate in the
// session, there's no need to scape its chunks right now. We can tell if a
// producer participates in the session by checking if the producer is allowed
// to write into the session's log buffers.
const auto& session_buffers = tracing_session->buffers_index;
bool producer_in_session =
std::any_of(session_buffers.begin(), session_buffers.end(),
[producer](BufferID buffer_id) {
return producer->allowed_target_buffers_.count(buffer_id);
});
if (!producer_in_session)
return;
PERFETTO_DLOG("Scraping SMB for producer %" PRIu16, producer->id_);
// Find and copy any uncommitted chunks from the SMB.
//
// In nominal conditions, the page layout of the used SMB pages should never
// change because the service is the only one who is supposed to modify used
// pages (to make them free again).
//
// However, the code here needs to deal with the case of a malicious producer
// altering the SMB in unpredictable ways. Thankfully the SMB size is
// immutable, so a chunk will always point to some valid memory, even if the
// producer alters the intended layout and chunk header concurrently.
// Ultimately a malicious producer altering the SMB's chunk layout while we
// are iterating in this function is not any different from the case of a
// malicious producer asking to commit a chunk made of random data, which is
// something this class has to deal with regardless.
//
// The only legitimate mutations that can happen from sane producers,
// concurrently to this function, are:
// A. free pages being partitioned,
// B. free chunks being migrated to kChunkBeingWritten,
// C. kChunkBeingWritten chunks being migrated to kChunkCompleted.
SharedMemoryABI* abi = &producer->shmem_abi_;
// num_pages() is immutable after the SMB is initialized and cannot be changed
// even by a producer even if malicious.
for (size_t page_idx = 0; page_idx < abi->num_pages(); page_idx++) {
uint32_t layout = abi->GetPageLayout(page_idx);
uint32_t used_chunks = abi->GetUsedChunks(layout); // Returns a bitmap.
// Skip empty pages.
if (used_chunks == 0)
continue;
// Scrape the chunks that are currently used. These should be either in
// state kChunkBeingWritten or kChunkComplete.
for (uint32_t chunk_idx = 0; used_chunks; chunk_idx++, used_chunks >>= 1) {
if (!(used_chunks & 1))
continue;
SharedMemoryABI::ChunkState state =
SharedMemoryABI::GetChunkStateFromLayout(layout, chunk_idx);
PERFETTO_DCHECK(state == SharedMemoryABI::kChunkBeingWritten ||
state == SharedMemoryABI::kChunkComplete);
bool chunk_complete = state == SharedMemoryABI::kChunkComplete;
SharedMemoryABI::Chunk chunk =
abi->GetChunkUnchecked(page_idx, layout, chunk_idx);
uint16_t packet_count;
uint8_t flags;
// GetPacketCountAndFlags has acquire_load semantics.
std::tie(packet_count, flags) = chunk.GetPacketCountAndFlags();
// It only makes sense to copy an incomplete chunk if there's at least
// one full packet available. (The producer may not have completed the
// last packet in it yet, so we need at least 2.)
if (!chunk_complete && packet_count < 2)
continue;
// At this point, it is safe to access the remaining header fields of
// the chunk. Even if the chunk was only just transferred from
// kChunkFree into kChunkBeingWritten state, the header should be
// written completely once the packet count increased above 1 (it was
// reset to 0 by the service when the chunk was freed).
WriterID writer_id = chunk.writer_id();
std::optional<BufferID> target_buffer_id =
producer->buffer_id_for_writer(writer_id);
// We can only scrape this chunk if we know which log buffer to copy it
// into.
if (!target_buffer_id)
continue;
// Skip chunks that don't belong to the requested tracing session.
bool target_buffer_belongs_to_session =
std::find(session_buffers.begin(), session_buffers.end(),
*target_buffer_id) != session_buffers.end();
if (!target_buffer_belongs_to_session)
continue;
uint32_t chunk_id =
chunk.header()->chunk_id.load(std::memory_order_relaxed);
CopyProducerPageIntoLogBuffer(
producer->id_, producer->uid_, producer->pid_, writer_id, chunk_id,
*target_buffer_id, packet_count, flags, chunk_complete,
chunk.payload_begin(), chunk.payload_size());
}
}
}
void TracingServiceImpl::FlushAndDisableTracing(TracingSessionID tsid) {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_DLOG("Triggering final flush for %" PRIu64, tsid);
auto weak_this = weak_ptr_factory_.GetWeakPtr();
Flush(tsid, 0, [weak_this, tsid](bool success) {
// This was a DLOG up to Jun 2021 (v16, Android S).
PERFETTO_LOG("FlushAndDisableTracing(%" PRIu64 ") done, success=%d", tsid,
success);
if (!weak_this)
return;
TracingSession* session = weak_this->GetTracingSession(tsid);
session->final_flush_outcome = success ? TraceStats::FINAL_FLUSH_SUCCEEDED
: TraceStats::FINAL_FLUSH_FAILED;
if (session->consumer_maybe_null) {
// If the consumer is still attached, just disable the session but give it
// a chance to read the contents.
weak_this->DisableTracing(tsid);
} else {
// If the consumer detached, destroy the session. If the consumer did
// start the session in long-tracing mode, the service will have saved
// the contents to the passed file. If not, the contents will be
// destroyed.
weak_this->FreeBuffers(tsid);
}
});
}
void TracingServiceImpl::PeriodicFlushTask(TracingSessionID tsid,
bool post_next_only) {
PERFETTO_DCHECK_THREAD(thread_checker_);
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session || tracing_session->state != TracingSession::STARTED)
return;
uint32_t flush_period_ms = tracing_session->config.flush_period_ms();
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostDelayedTask(
[weak_this, tsid] {
if (weak_this)
weak_this->PeriodicFlushTask(tsid, /*post_next_only=*/false);
},
flush_period_ms - static_cast<uint32_t>(base::GetWallTimeMs().count() %
flush_period_ms));
if (post_next_only)
return;
PERFETTO_DLOG("Triggering periodic flush for trace session %" PRIu64, tsid);
Flush(tsid, 0, [](bool success) {
if (!success)
PERFETTO_ELOG("Periodic flush timed out");
});
}
void TracingServiceImpl::PeriodicClearIncrementalStateTask(
TracingSessionID tsid,
bool post_next_only) {
PERFETTO_DCHECK_THREAD(thread_checker_);
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session || tracing_session->state != TracingSession::STARTED)
return;
uint32_t clear_period_ms =
tracing_session->config.incremental_state_config().clear_period_ms();
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostDelayedTask(
[weak_this, tsid] {
if (weak_this)
weak_this->PeriodicClearIncrementalStateTask(
tsid, /*post_next_only=*/false);
},
clear_period_ms - static_cast<uint32_t>(base::GetWallTimeMs().count() %
clear_period_ms));
if (post_next_only)
return;
PERFETTO_DLOG(
"Performing periodic incremental state clear for trace session %" PRIu64,
tsid);
// Queue the IPCs to producers with active data sources that opted in.
std::map<ProducerID, std::vector<DataSourceInstanceID>> clear_map;
for (const auto& kv : tracing_session->data_source_instances) {
ProducerID producer_id = kv.first;
const DataSourceInstance& data_source = kv.second;
if (data_source.handles_incremental_state_clear) {
clear_map[producer_id].push_back(data_source.instance_id);
}
}
for (const auto& kv : clear_map) {
ProducerID producer_id = kv.first;
const std::vector<DataSourceInstanceID>& data_sources = kv.second;
ProducerEndpointImpl* producer = GetProducer(producer_id);
if (!producer) {
PERFETTO_DFATAL("Producer does not exist.");
continue;
}
producer->ClearIncrementalState(data_sources);
}
}
bool TracingServiceImpl::ReadBuffersIntoConsumer(
TracingSessionID tsid,
ConsumerEndpointImpl* consumer) {
PERFETTO_DCHECK(consumer);
PERFETTO_DCHECK_THREAD(thread_checker_);
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session) {
PERFETTO_DLOG(
"Cannot ReadBuffersIntoConsumer(): no tracing session is active");
return false;
}
if (tracing_session->write_into_file) {
// If the consumer enabled tracing and asked to save the contents into the
// passed file makes little sense to also try to read the buffers over IPC,
// as that would just steal data from the periodic draining task.
PERFETTO_ELOG("Consumer trying to read from write_into_file session.");
return false;
}
if (IsWaitingForTrigger(tracing_session))
return false;
// This is a rough threshold to determine how much to read from the buffer in
// each task. This is to avoid executing a single huge sending task for too
// long and risk to hit the watchdog. This is *not* an upper bound: we just
// stop accumulating new packets and PostTask *after* we cross this threshold.
// This constant essentially balances the PostTask and IPC overhead vs the
// responsiveness of the service. An extremely small value will cause one IPC
// and one PostTask for each slice but will keep the service extremely
// responsive. An extremely large value will batch the send for the full
// buffer in one large task, will hit the blocking send() once the socket
// buffers are full and hang the service for a bit (until the consumer
// catches up).
static constexpr size_t kApproxBytesPerTask = 32768;
bool has_more;
std::vector<TracePacket> packets =
ReadBuffers(tracing_session, kApproxBytesPerTask, &has_more);
if (has_more) {
auto weak_consumer = consumer->weak_ptr_factory_.GetWeakPtr();
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this, weak_consumer, tsid] {
if (!weak_this || !weak_consumer)
return;
weak_this->ReadBuffersIntoConsumer(tsid, weak_consumer.get());
});
}
// Keep this as tail call, just in case the consumer re-enters.
consumer->consumer_->OnTraceData(std::move(packets), has_more);
return true;
}
bool TracingServiceImpl::ReadBuffersIntoFile(TracingSessionID tsid) {
PERFETTO_DCHECK_THREAD(thread_checker_);
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session) {
// This will be hit systematically from the PostDelayedTask. Avoid logging,
// it would be just spam.
return false;
}
// This can happen if the file is closed by a previous task because it reaches
// |max_file_size_bytes|.
if (!tracing_session->write_into_file)
return false;
if (IsWaitingForTrigger(tracing_session))
return false;
// ReadBuffers() can allocate memory internally, for filtering. By limiting
// the data that ReadBuffers() reads to kWriteIntoChunksSize per iteration,
// we limit the amount of memory used on each iteration.
//
// It would be tempting to split this into multiple tasks like in
// ReadBuffersIntoConsumer, but that's not currently possible.
// ReadBuffersIntoFile has to read the whole available data before returning,
// to support the disable_immediately=true code paths.
bool has_more = true;
bool stop_writing_into_file = false;
do {
std::vector<TracePacket> packets =
ReadBuffers(tracing_session, kWriteIntoFileChunkSize, &has_more);
stop_writing_into_file = WriteIntoFile(tracing_session, std::move(packets));
} while (has_more && !stop_writing_into_file);
if (stop_writing_into_file || tracing_session->write_period_ms == 0) {
// Ensure all data was written to the file before we close it.
base::FlushFile(tracing_session->write_into_file.get());
tracing_session->write_into_file.reset();
tracing_session->write_period_ms = 0;
if (tracing_session->state == TracingSession::STARTED)
DisableTracing(tsid);
return true;
}
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostDelayedTask(
[weak_this, tsid] {
if (weak_this)
weak_this->ReadBuffersIntoFile(tsid);
},
tracing_session->delay_to_next_write_period_ms());
return true;
}
bool TracingServiceImpl::IsWaitingForTrigger(TracingSession* tracing_session) {
// Ignore the logic below for cloned tracing sessions. In this case we
// actually want to read the (cloned) trace buffers even if no trigger was
// hit.
if (tracing_session->state == TracingSession::CLONED_READ_ONLY) {
return false;
}
// When a tracing session is waiting for a trigger, it is considered empty. If
// a tracing session finishes and moves into DISABLED without ever receiving a
// trigger, the trace should never return any data. This includes the
// synthetic packets like TraceConfig and Clock snapshots. So we bail out
// early and let the consumer know there is no data.
if (!tracing_session->config.trigger_config().triggers().empty() &&
tracing_session->received_triggers.empty()) {
PERFETTO_DLOG(
"ReadBuffers(): tracing session has not received a trigger yet.");
return true;
}
return false;
}
std::vector<TracePacket> TracingServiceImpl::ReadBuffers(
TracingSession* tracing_session,
size_t threshold,
bool* has_more) {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_DCHECK(tracing_session);
*has_more = false;
std::vector<TracePacket> packets;
packets.reserve(1024); // Just an educated guess to avoid trivial expansions.
if (!tracing_session->initial_clock_snapshot.empty()) {
EmitClockSnapshot(tracing_session,
std::move(tracing_session->initial_clock_snapshot),
&packets);
}
for (auto& snapshot : tracing_session->clock_snapshot_ring_buffer) {
PERFETTO_DCHECK(!snapshot.empty());
EmitClockSnapshot(tracing_session, std::move(snapshot), &packets);
}
tracing_session->clock_snapshot_ring_buffer.clear();
if (tracing_session->should_emit_sync_marker) {
EmitSyncMarker(&packets);
tracing_session->should_emit_sync_marker = false;
}
if (!tracing_session->config.builtin_data_sources().disable_trace_config()) {
MaybeEmitUuidAndTraceConfig(tracing_session, &packets);
MaybeEmitReceivedTriggers(tracing_session, &packets);
}
if (!tracing_session->config.builtin_data_sources().disable_system_info())
MaybeEmitSystemInfo(tracing_session, &packets);
// Note that in the proto comment, we guarantee that the tracing_started
// lifecycle event will be emitted before any data packets so make sure to
// keep this before reading the tracing buffers.
if (!tracing_session->config.builtin_data_sources().disable_service_events())
EmitLifecycleEvents(tracing_session, &packets);
size_t packets_bytes = 0; // SUM(slice.size() for each slice in |packets|).
// Add up size for packets added by the Maybe* calls above.
for (const TracePacket& packet : packets) {
packets_bytes += packet.size();
}
bool did_hit_threshold = false;
for (size_t buf_idx = 0;
buf_idx < tracing_session->num_buffers() && !did_hit_threshold;
buf_idx++) {
auto tbuf_iter = buffers_.find(tracing_session->buffers_index[buf_idx]);
if (tbuf_iter == buffers_.end()) {
PERFETTO_DFATAL("Buffer not found.");
continue;
}
TraceBuffer& tbuf = *tbuf_iter->second;
tbuf.BeginRead();
while (!did_hit_threshold) {
TracePacket packet;
TraceBuffer::PacketSequenceProperties sequence_properties{};
bool previous_packet_dropped;
if (!tbuf.ReadNextTracePacket(&packet, &sequence_properties,
&previous_packet_dropped)) {
break;
}
PERFETTO_DCHECK(sequence_properties.producer_id_trusted != 0);
PERFETTO_DCHECK(sequence_properties.writer_id != 0);
PERFETTO_DCHECK(sequence_properties.producer_uid_trusted != kInvalidUid);
// Not checking sequence_properties.producer_pid_trusted: it is
// base::kInvalidPid if the platform doesn't support it.
PERFETTO_DCHECK(packet.size() > 0);
if (!PacketStreamValidator::Validate(packet.slices())) {
tracing_session->invalid_packets++;
PERFETTO_DLOG("Dropping invalid packet");
continue;
}
// Append a slice with the trusted field data. This can't be spoofed
// because above we validated that the existing slices don't contain any
// trusted fields. For added safety we append instead of prepending
// because according to protobuf semantics, if the same field is
// encountered multiple times the last instance takes priority. Note that
// truncated packets are also rejected, so the producer can't give us a
// partial packet (e.g., a truncated string) which only becomes valid when
// the trusted data is appended here.
Slice slice = Slice::Allocate(32);
protozero::StaticBuffered<protos::pbzero::TracePacket> trusted_packet(
slice.own_data(), slice.size);
trusted_packet->set_trusted_uid(
static_cast<int32_t>(sequence_properties.producer_uid_trusted));
trusted_packet->set_trusted_packet_sequence_id(
tracing_session->GetPacketSequenceID(
sequence_properties.producer_id_trusted,
sequence_properties.writer_id));
if (sequence_properties.producer_pid_trusted != base::kInvalidPid) {
// Not supported on all platforms.
trusted_packet->set_trusted_pid(
static_cast<int32_t>(sequence_properties.producer_pid_trusted));
}
if (previous_packet_dropped)
trusted_packet->set_previous_packet_dropped(previous_packet_dropped);
slice.size = trusted_packet.Finalize();
packet.AddSlice(std::move(slice));
// Append the packet (inclusive of the trusted uid) to |packets|.
packets_bytes += packet.size();
did_hit_threshold = packets_bytes >= threshold;
packets.emplace_back(std::move(packet));
} // for(packets...)
} // for(buffers...)
*has_more = did_hit_threshold;
// Only emit the "read complete" lifetime event when there is no more trace
// data available to read. These events are used as safe points to limit
// sorting in trace processor: the code shouldn't emit the event unless the
// buffers are empty.
if (!*has_more && !tracing_session->config.builtin_data_sources()
.disable_service_events()) {
// We don't bother snapshotting clocks here because we wouldn't be able to
// emit it and we shouldn't have significant drift from the last snapshot in
// any case.
SnapshotLifecyleEvent(tracing_session,
protos::pbzero::TracingServiceEvent::
kReadTracingBuffersCompletedFieldNumber,
false /* snapshot_clocks */);
EmitLifecycleEvents(tracing_session, &packets);
}
// Only emit the stats when there is no more trace data is available to read.
// That way, any problems that occur while reading from the buffers are
// reflected in the emitted stats. This is particularly important for use
// cases where ReadBuffers is only ever called after the tracing session is
// stopped.
if (!*has_more && tracing_session->should_emit_stats) {
EmitStats(tracing_session, &packets);
tracing_session->should_emit_stats = false;
}
MaybeFilterPackets(tracing_session, &packets);
if (!*has_more) {
// We've observed some extremely high memory usage by scudo after
// MaybeFilterPackets in the past. The original bug (b/195145848) is fixed
// now, but this code asks scudo to release memory just in case.
base::MaybeReleaseAllocatorMemToOS();
}
return packets;
}
void TracingServiceImpl::MaybeFilterPackets(TracingSession* tracing_session,
std::vector<TracePacket>* packets) {
// If the tracing session specified a filter, run all packets through the
// filter and replace them with the filter results.
// The process below mantains the cardinality of input packets. Even if an
// entire packet is filtered out, we emit a zero-sized TracePacket proto. That
// makes debugging and reasoning about the trace stats easier.
// This place swaps the contents of each |packets| entry in place.
if (!tracing_session->trace_filter) {
return;
}
protozero::MessageFilter& trace_filter = *tracing_session->trace_filter;
// The filter root shoud be reset from protos.Trace to protos.TracePacket
// by the earlier call to SetFilterRoot() in EnableTracing().
PERFETTO_DCHECK(trace_filter.root_msg_index() != 0);
std::vector<protozero::MessageFilter::InputSlice> filter_input;
for (TracePacket& packet : *packets) {
const auto& packet_slices = packet.slices();
filter_input.clear();
filter_input.resize(packet_slices.size());
++tracing_session->filter_input_packets;
tracing_session->filter_input_bytes += packet.size();
for (size_t i = 0; i < packet_slices.size(); ++i)
filter_input[i] = {packet_slices[i].start, packet_slices[i].size};
auto filtered_packet = trace_filter.FilterMessageFragments(
&filter_input[0], filter_input.size());
// Replace the packet in-place with the filtered one (unless failed).
packet = TracePacket();
if (filtered_packet.error) {
++tracing_session->filter_errors;
PERFETTO_DLOG("Trace packet filtering failed @ packet %" PRIu64,
tracing_session->filter_input_packets);
continue;
}
tracing_session->filter_output_bytes += filtered_packet.size;
AppendOwnedSlicesToPacket(std::move(filtered_packet.data),
filtered_packet.size, kMaxTracePacketSliceSize,
&packet);
}
}
bool TracingServiceImpl::WriteIntoFile(TracingSession* tracing_session,
std::vector<TracePacket> packets) {
if (!tracing_session->write_into_file) {
return false;
}
const uint64_t max_size = tracing_session->max_file_size_bytes
? tracing_session->max_file_size_bytes
: std::numeric_limits<size_t>::max();
size_t total_slices = 0;
for (const TracePacket& packet : packets) {
total_slices += packet.slices().size();
}
// When writing into a file, the file should look like a root trace.proto
// message. Each packet should be prepended with a proto preamble stating
// its field id (within trace.proto) and size. Hence the addition below.
const size_t max_iovecs = total_slices + packets.size();
size_t num_iovecs = 0;
bool stop_writing_into_file = false;
std::unique_ptr<struct iovec[]> iovecs(new struct iovec[max_iovecs]);
size_t num_iovecs_at_last_packet = 0;
uint64_t bytes_about_to_be_written = 0;
for (TracePacket& packet : packets) {
std::tie(iovecs[num_iovecs].iov_base, iovecs[num_iovecs].iov_len) =
packet.GetProtoPreamble();
bytes_about_to_be_written += iovecs[num_iovecs].iov_len;
num_iovecs++;
for (const Slice& slice : packet.slices()) {
// writev() doesn't change the passed pointer. However, struct iovec
// take a non-const ptr because it's the same struct used by readv().
// Hence the const_cast here.
char* start = static_cast<char*>(const_cast<void*>(slice.start));
bytes_about_to_be_written += slice.size;
iovecs[num_iovecs++] = {start, slice.size};
}
if (tracing_session->bytes_written_into_file + bytes_about_to_be_written >=
max_size) {
stop_writing_into_file = true;
num_iovecs = num_iovecs_at_last_packet;
break;
}
num_iovecs_at_last_packet = num_iovecs;
}
PERFETTO_DCHECK(num_iovecs <= max_iovecs);
int fd = *tracing_session->write_into_file;
uint64_t total_wr_size = 0;
// writev() can take at most IOV_MAX entries per call. Batch them.
constexpr size_t kIOVMax = IOV_MAX;
for (size_t i = 0; i < num_iovecs; i += kIOVMax) {
int iov_batch_size = static_cast<int>(std::min(num_iovecs - i, kIOVMax));
ssize_t wr_size = PERFETTO_EINTR(writev(fd, &iovecs[i], iov_batch_size));
if (wr_size <= 0) {
PERFETTO_PLOG("writev() failed");
stop_writing_into_file = true;
break;
}
total_wr_size += static_cast<size_t>(wr_size);
}
tracing_session->bytes_written_into_file += total_wr_size;
PERFETTO_DLOG("Draining into file, written: %" PRIu64 " KB, stop: %d",
(total_wr_size + 1023) / 1024, stop_writing_into_file);
return stop_writing_into_file;
}
void TracingServiceImpl::FreeBuffers(TracingSessionID tsid) {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_DLOG("Freeing buffers for session %" PRIu64, tsid);
TracingSession* tracing_session = GetTracingSession(tsid);
if (!tracing_session) {
PERFETTO_DLOG("FreeBuffers() failed, invalid session ID %" PRIu64, tsid);
return; // TODO(primiano): signal failure?
}
DisableTracing(tsid, /*disable_immediately=*/true);
PERFETTO_DCHECK(tracing_session->AllDataSourceInstancesStopped());
tracing_session->data_source_instances.clear();
for (auto& producer_entry : producers_) {
ProducerEndpointImpl* producer = producer_entry.second;
producer->OnFreeBuffers(tracing_session->buffers_index);
}
for (BufferID buffer_id : tracing_session->buffers_index) {
buffer_ids_.Free(buffer_id);
PERFETTO_DCHECK(buffers_.count(buffer_id) == 1);
buffers_.erase(buffer_id);
}
bool notify_traceur =
tracing_session->config.notify_traceur() &&
tracing_session->state != TracingSession::CLONED_READ_ONLY;
bool is_long_trace =
(tracing_session->config.write_into_file() &&
tracing_session->config.file_write_period_ms() < kMillisPerDay);
tracing_sessions_.erase(tsid);
tracing_session = nullptr;
UpdateMemoryGuardrail();
PERFETTO_LOG("Tracing session %" PRIu64 " ended, total sessions:%zu", tsid,
tracing_sessions_.size());
#if PERFETTO_BUILDFLAG(PERFETTO_ANDROID_BUILD) && \
PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
if (notify_traceur && is_long_trace) {
PERFETTO_LAZY_LOAD(android_internal::NotifyTraceSessionEnded, notify_fn);
if (!notify_fn || !notify_fn(/*session_stolen=*/false))
PERFETTO_ELOG("Failed to notify Traceur long tracing has ended");
}
#else
base::ignore_result(notify_traceur);
base::ignore_result(is_long_trace);
#endif
}
void TracingServiceImpl::RegisterDataSource(ProducerID producer_id,
const DataSourceDescriptor& desc) {
PERFETTO_DCHECK_THREAD(thread_checker_);
if (desc.name().empty()) {
PERFETTO_DLOG("Received RegisterDataSource() with empty name");
return;
}
ProducerEndpointImpl* producer = GetProducer(producer_id);
if (!producer) {
PERFETTO_DFATAL("Producer not found.");
return;
}
// Check that the producer doesn't register two data sources with the same ID.
// Note that we tolerate |id| == 0 because until Android T / v22 the |id|
// field didn't exist.
for (const auto& kv : data_sources_) {
if (desc.id() && kv.second.producer_id == producer_id &&
kv.second.descriptor.id() == desc.id()) {
PERFETTO_ELOG(
"Failed to register data source \"%s\". A data source with the same "
"id %" PRIu64 " (name=\"%s\") is already registered for producer %d",
desc.name().c_str(), desc.id(), kv.second.descriptor.name().c_str(),
producer_id);
return;
}
}
PERFETTO_DLOG("Producer %" PRIu16 " registered data source \"%s\"",
producer_id, desc.name().c_str());
auto reg_ds = data_sources_.emplace(desc.name(),
RegisteredDataSource{producer_id, desc});
// If there are existing tracing sessions, we need to check if the new
// data source is enabled by any of them.
for (auto& iter : tracing_sessions_) {
TracingSession& tracing_session = iter.second;
if (tracing_session.state != TracingSession::STARTED &&
tracing_session.state != TracingSession::CONFIGURED) {
continue;
}
TraceConfig::ProducerConfig producer_config;
for (auto& config : tracing_session.config.producers()) {
if (producer->name_ == config.producer_name()) {
producer_config = config;
break;
}
}
for (const TraceConfig::DataSource& cfg_data_source :
tracing_session.config.data_sources()) {
if (cfg_data_source.config().name() != desc.name())
continue;
DataSourceInstance* ds_inst = SetupDataSource(
cfg_data_source, producer_config, reg_ds->second, &tracing_session);
if (ds_inst && tracing_session.state == TracingSession::STARTED)
StartDataSourceInstance(producer, &tracing_session, ds_inst);
}
} // for(iter : tracing_sessions_)
}
void TracingServiceImpl::UpdateDataSource(
ProducerID producer_id,
const DataSourceDescriptor& new_desc) {
if (new_desc.id() == 0) {
PERFETTO_ELOG("UpdateDataSource() must have a non-zero id");
return;
}
// If this producer has already registered a matching descriptor name and id,
// just update the descriptor.
RegisteredDataSource* data_source = nullptr;
auto range = data_sources_.equal_range(new_desc.name());
for (auto it = range.first; it != range.second; ++it) {
if (it->second.producer_id == producer_id &&
it->second.descriptor.id() == new_desc.id()) {
data_source = &it->second;
break;
}
}
if (!data_source) {
PERFETTO_ELOG(
"UpdateDataSource() failed, could not find an existing data source "
"with name=\"%s\" id=%" PRIu64,
new_desc.name().c_str(), new_desc.id());
return;
}
data_source->descriptor = new_desc;
}
void TracingServiceImpl::StopDataSourceInstance(ProducerEndpointImpl* producer,
TracingSession* tracing_session,
DataSourceInstance* instance,
bool disable_immediately) {
const DataSourceInstanceID ds_inst_id = instance->instance_id;
if (instance->will_notify_on_stop && !disable_immediately) {
instance->state = DataSourceInstance::STOPPING;
} else {
instance->state = DataSourceInstance::STOPPED;
}
if (tracing_session->consumer_maybe_null) {
tracing_session->consumer_maybe_null->OnDataSourceInstanceStateChange(
*producer, *instance);
}
producer->StopDataSource(ds_inst_id);
}
void TracingServiceImpl::UnregisterDataSource(ProducerID producer_id,
const std::string& name) {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_DLOG("Producer %" PRIu16 " unregistered data source \"%s\"",
producer_id, name.c_str());
PERFETTO_CHECK(producer_id);
ProducerEndpointImpl* producer = GetProducer(producer_id);
PERFETTO_DCHECK(producer);
for (auto& kv : tracing_sessions_) {
auto& ds_instances = kv.second.data_source_instances;
bool removed = false;
for (auto it = ds_instances.begin(); it != ds_instances.end();) {
if (it->first == producer_id && it->second.data_source_name == name) {
DataSourceInstanceID ds_inst_id = it->second.instance_id;
if (it->second.state != DataSourceInstance::STOPPED) {
if (it->second.state != DataSourceInstance::STOPPING) {
StopDataSourceInstance(producer, &kv.second, &it->second,
/* disable_immediately = */ false);
}
// Mark the instance as stopped immediately, since we are
// unregistering it below.
//
// The StopDataSourceInstance above might have set the state to
// STOPPING so this condition isn't an else.
if (it->second.state == DataSourceInstance::STOPPING)
NotifyDataSourceStopped(producer_id, ds_inst_id);
}
it = ds_instances.erase(it);
removed = true;
} else {
++it;
}
} // for (data_source_instances)
if (removed)
MaybeNotifyAllDataSourcesStarted(&kv.second);
} // for (tracing_session)
for (auto it = data_sources_.begin(); it != data_sources_.end(); ++it) {
if (it->second.producer_id == producer_id &&
it->second.descriptor.name() == name) {
data_sources_.erase(it);
return;
}
}
PERFETTO_DFATAL(
"Tried to unregister a non-existent data source \"%s\" for "
"producer %" PRIu16,
name.c_str(), producer_id);
}
TracingServiceImpl::DataSourceInstance* TracingServiceImpl::SetupDataSource(
const TraceConfig::DataSource& cfg_data_source,
const TraceConfig::ProducerConfig& producer_config,
const RegisteredDataSource& data_source,
TracingSession* tracing_session) {
PERFETTO_DCHECK_THREAD(thread_checker_);
ProducerEndpointImpl* producer = GetProducer(data_source.producer_id);
PERFETTO_DCHECK(producer);
// An existing producer that is not ftrace could have registered itself as
// ftrace, we must not enable it in that case.
if (lockdown_mode_ && producer->uid_ != uid_) {
PERFETTO_DLOG("Lockdown mode: not enabling producer %hu", producer->id_);
return nullptr;
}
// TODO(primiano): Add tests for registration ordering (data sources vs
// consumers).
if (!NameMatchesFilter(producer->name_,
cfg_data_source.producer_name_filter(),
cfg_data_source.producer_name_regex_filter())) {
PERFETTO_DLOG("Data source: %s is filtered out for producer: %s",
cfg_data_source.config().name().c_str(),
producer->name_.c_str());
return nullptr;
}
auto relative_buffer_id = cfg_data_source.config().target_buffer();
if (relative_buffer_id >= tracing_session->num_buffers()) {
PERFETTO_LOG(
"The TraceConfig for DataSource %s specified a target_buffer out of "
"bound (%d). Skipping it.",
cfg_data_source.config().name().c_str(), relative_buffer_id);
return nullptr;
}
// Create a copy of the DataSourceConfig specified in the trace config. This
// will be passed to the producer after translating the |target_buffer| id.
// The |target_buffer| parameter passed by the consumer in the trace config is
// relative to the buffers declared in the same trace config. This has to be
// translated to the global BufferID before passing it to the producers, which
// don't know anything about tracing sessions and consumers.
DataSourceInstanceID inst_id = ++last_data_source_instance_id_;
auto insert_iter = tracing_session->data_source_instances.emplace(
std::piecewise_construct, //
std::forward_as_tuple(producer->id_),
std::forward_as_tuple(
inst_id,
cfg_data_source.config(), // Deliberate copy.
data_source.descriptor.name(),
data_source.descriptor.will_notify_on_start(),
data_source.descriptor.will_notify_on_stop(),
data_source.descriptor.handles_incremental_state_clear()));
DataSourceInstance* ds_instance = &insert_iter->second;
// New data source instance starts out in CONFIGURED state.
if (tracing_session->consumer_maybe_null) {
tracing_session->consumer_maybe_null->OnDataSourceInstanceStateChange(
*producer, *ds_instance);
}
DataSourceConfig& ds_config = ds_instance->config;
ds_config.set_trace_duration_ms(tracing_session->config.duration_ms());
// Rationale for `if (prefer) set_prefer(true)`, rather than `set(prefer)`:
// ComputeStartupConfigHash() in tracing_muxer_impl.cc compares hashes of the
// DataSourceConfig and expects to know (and clear) the fields generated by
// the tracing service. Unconditionally adding a new field breaks backward
// compatibility of startup tracing with older SDKs, because the serialization
// also propagates unkonwn fields, breaking the hash matching check.
if (tracing_session->config.prefer_suspend_clock_for_duration())
ds_config.set_prefer_suspend_clock_for_duration(true);
ds_config.set_stop_timeout_ms(tracing_session->data_source_stop_timeout_ms());
ds_config.set_enable_extra_guardrails(
tracing_session->config.enable_extra_guardrails());
if (tracing_session->consumer_uid == 1066 /* AID_STATSD */ &&
tracing_session->config.statsd_metadata().triggering_config_uid() !=
2000 /* AID_SHELL */
&& tracing_session->config.statsd_metadata().triggering_config_uid() !=
0 /* AID_ROOT */) {
// StatsD can be triggered either by shell, root or an app that has DUMP and
// USAGE_STATS permission. When triggered by shell or root, we do not want
// to consider the trace a trusted system trace, as it was initiated by the
// user. Otherwise, it has to come from an app with DUMP and
// PACKAGE_USAGE_STATS, which has to be preinstalled and trusted by the
// system.
// Check for shell / root: https://bit.ly/3b7oZNi
// Check for DUMP or PACKAGE_USAGE_STATS: https://bit.ly/3ep0NrR
ds_config.set_session_initiator(
DataSourceConfig::SESSION_INITIATOR_TRUSTED_SYSTEM);
} else {
// Unset in case the consumer set it.
// We need to be able to trust this field.
ds_config.set_session_initiator(
DataSourceConfig::SESSION_INITIATOR_UNSPECIFIED);
}
ds_config.set_tracing_session_id(tracing_session->id);
BufferID global_id = tracing_session->buffers_index[relative_buffer_id];
PERFETTO_DCHECK(global_id);
ds_config.set_target_buffer(global_id);
PERFETTO_DLOG("Setting up data source %s with target buffer %" PRIu16,
ds_config.name().c_str(), global_id);
if (!producer->shared_memory()) {
// Determine the SMB page size. Must be an integer multiple of 4k.
// As for the SMB size below, the decision tree is as follows:
// 1. Give priority to what is defined in the trace config.
// 2. If unset give priority to the hint passed by the producer.
// 3. Keep within bounds and ensure it's a multiple of 4k.
size_t page_size = producer_config.page_size_kb() * 1024;
if (page_size == 0)
page_size = producer->shmem_page_size_hint_bytes_;
// Determine the SMB size. Must be an integer multiple of the SMB page size.
// The decision tree is as follows:
// 1. Give priority to what defined in the trace config.
// 2. If unset give priority to the hint passed by the producer.
// 3. Keep within bounds and ensure it's a multiple of the page size.
size_t shm_size = producer_config.shm_size_kb() * 1024;
if (shm_size == 0)
shm_size = producer->shmem_size_hint_bytes_;
auto valid_sizes = EnsureValidShmSizes(shm_size, page_size);
if (valid_sizes != std::tie(shm_size, page_size)) {
PERFETTO_DLOG(
"Invalid configured SMB sizes: shm_size %zu page_size %zu. Falling "
"back to shm_size %zu page_size %zu.",
shm_size, page_size, std::get<0>(valid_sizes),
std::get<1>(valid_sizes));
}
std::tie(shm_size, page_size) = valid_sizes;
// TODO(primiano): right now Create() will suicide in case of OOM if the
// mmap fails. We should instead gracefully fail the request and tell the
// client to go away.
PERFETTO_DLOG("Creating SMB of %zu KB for producer \"%s\"", shm_size / 1024,
producer->name_.c_str());
auto shared_memory = shm_factory_->CreateSharedMemory(shm_size);
producer->SetupSharedMemory(std::move(shared_memory), page_size,
/*provided_by_producer=*/false);
}
producer->SetupDataSource(inst_id, ds_config);
return ds_instance;
}
// Note: all the fields % *_trusted ones are untrusted, as in, the Producer
// might be lying / returning garbage contents. |src| and |size| can be trusted
// in terms of being a valid pointer, but not the contents.
void TracingServiceImpl::CopyProducerPageIntoLogBuffer(
ProducerID producer_id_trusted,
uid_t producer_uid_trusted,
pid_t producer_pid_trusted,
WriterID writer_id,
ChunkID chunk_id,
BufferID buffer_id,
uint16_t num_fragments,
uint8_t chunk_flags,
bool chunk_complete,
const uint8_t* src,
size_t size) {
PERFETTO_DCHECK_THREAD(thread_checker_);
ProducerEndpointImpl* producer = GetProducer(producer_id_trusted);
if (!producer) {
PERFETTO_DFATAL("Producer not found.");
chunks_discarded_++;
return;
}
TraceBuffer* buf = GetBufferByID(buffer_id);
if (!buf) {
PERFETTO_DLOG("Could not find target buffer %" PRIu16
" for producer %" PRIu16,
buffer_id, producer_id_trusted);
chunks_discarded_++;
return;
}
// Verify that the producer is actually allowed to write into the target
// buffer specified in the request. This prevents a malicious producer from
// injecting data into a log buffer that belongs to a tracing session the
// producer is not part of.
if (!producer->is_allowed_target_buffer(buffer_id)) {
PERFETTO_ELOG("Producer %" PRIu16
" tried to write into forbidden target buffer %" PRIu16,
producer_id_trusted, buffer_id);
PERFETTO_DFATAL("Forbidden target buffer");
chunks_discarded_++;
return;
}
// If the writer was registered by the producer, it should only write into the
// buffer it was registered with.
std::optional<BufferID> associated_buffer =
producer->buffer_id_for_writer(writer_id);
if (associated_buffer && *associated_buffer != buffer_id) {
PERFETTO_ELOG("Writer %" PRIu16 " of producer %" PRIu16
" was registered to write into target buffer %" PRIu16
", but tried to write into buffer %" PRIu16,
writer_id, producer_id_trusted, *associated_buffer,
buffer_id);
PERFETTO_DFATAL("Wrong target buffer");
chunks_discarded_++;
return;
}
buf->CopyChunkUntrusted(producer_id_trusted, producer_uid_trusted,
producer_pid_trusted, writer_id, chunk_id,
num_fragments, chunk_flags, chunk_complete, src,
size);
}
void TracingServiceImpl::ApplyChunkPatches(
ProducerID producer_id_trusted,
const std::vector<CommitDataRequest::ChunkToPatch>& chunks_to_patch) {
PERFETTO_DCHECK_THREAD(thread_checker_);
for (const auto& chunk : chunks_to_patch) {
const ChunkID chunk_id = static_cast<ChunkID>(chunk.chunk_id());
const WriterID writer_id = static_cast<WriterID>(chunk.writer_id());
TraceBuffer* buf =
GetBufferByID(static_cast<BufferID>(chunk.target_buffer()));
static_assert(std::numeric_limits<ChunkID>::max() == kMaxChunkID,
"Add a '|| chunk_id > kMaxChunkID' below if this fails");
if (!writer_id || writer_id > kMaxWriterID || !buf) {
// This can genuinely happen when the trace is stopped. The producers
// might see the stop signal with some delay and try to keep sending
// patches left soon after.
PERFETTO_DLOG(
"Received invalid chunks_to_patch request from Producer: %" PRIu16
", BufferID: %" PRIu32 " ChunkdID: %" PRIu32 " WriterID: %" PRIu16,
producer_id_trusted, chunk.target_buffer(), chunk_id, writer_id);
patches_discarded_ += static_cast<uint64_t>(chunk.patches_size());
continue;
}
// Note, there's no need to validate that the producer is allowed to write
// to the specified buffer ID (or that it's the correct buffer ID for a
// registered TraceWriter). That's because TraceBuffer uses the producer ID
// and writer ID to look up the chunk to patch. If the producer specifies an
// incorrect buffer, this lookup will fail and TraceBuffer will ignore the
// patches. Because the producer ID is trusted, there's also no way for a
// malicious producer to patch another producer's data.
// Speculate on the fact that there are going to be a limited amount of
// patches per request, so we can allocate the |patches| array on the stack.
std::array<TraceBuffer::Patch, 1024> patches; // Uninitialized.
if (chunk.patches().size() > patches.size()) {
PERFETTO_ELOG("Too many patches (%zu) batched in the same request",
patches.size());
PERFETTO_DFATAL("Too many patches");
patches_discarded_ += static_cast<uint64_t>(chunk.patches_size());
continue;
}
size_t i = 0;
for (const auto& patch : chunk.patches()) {
const std::string& patch_data = patch.data();
if (patch_data.size() != patches[i].data.size()) {
PERFETTO_ELOG("Received patch from producer: %" PRIu16
" of unexpected size %zu",
producer_id_trusted, patch_data.size());
patches_discarded_++;
continue;
}
patches[i].offset_untrusted = patch.offset();
memcpy(&patches[i].data[0], patch_data.data(), patches[i].data.size());
i++;
}
buf->TryPatchChunkContents(producer_id_trusted, writer_id, chunk_id,
&patches[0], i, chunk.has_more_patches());
}
}
TracingServiceImpl::TracingSession* TracingServiceImpl::GetDetachedSession(
uid_t uid,
const std::string& key) {
PERFETTO_DCHECK_THREAD(thread_checker_);
for (auto& kv : tracing_sessions_) {
TracingSession* session = &kv.second;
if (session->consumer_uid == uid && session->detach_key == key) {
PERFETTO_DCHECK(session->consumer_maybe_null == nullptr);
return session;
}
}
return nullptr;
}
TracingServiceImpl::TracingSession* TracingServiceImpl::GetTracingSession(
TracingSessionID tsid) {
PERFETTO_DCHECK_THREAD(thread_checker_);
auto it = tsid ? tracing_sessions_.find(tsid) : tracing_sessions_.end();
if (it == tracing_sessions_.end())
return nullptr;
return &it->second;
}
TracingServiceImpl::TracingSession*
TracingServiceImpl::FindTracingSessionWithMaxBugreportScore() {
TracingSession* max_session = nullptr;
for (auto& session_id_and_session : tracing_sessions_) {
auto& session = session_id_and_session.second;
const int32_t score = session.config.bugreport_score();
// Exclude sessions with 0 (or below) score. By default tracing sessions
// should NOT be eligible to be attached to bugreports.
if (score <= 0 || session.state != TracingSession::STARTED)
continue;
if (!max_session || score > max_session->config.bugreport_score())
max_session = &session;
}
return max_session;
}
ProducerID TracingServiceImpl::GetNextProducerID() {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_CHECK(producers_.size() < kMaxProducerID);
do {
++last_producer_id_;
} while (producers_.count(last_producer_id_) || last_producer_id_ == 0);
PERFETTO_DCHECK(last_producer_id_ > 0 && last_producer_id_ <= kMaxProducerID);
return last_producer_id_;
}
TraceBuffer* TracingServiceImpl::GetBufferByID(BufferID buffer_id) {
auto buf_iter = buffers_.find(buffer_id);
if (buf_iter == buffers_.end())
return nullptr;
return &*buf_iter->second;
}
void TracingServiceImpl::OnStartTriggersTimeout(TracingSessionID tsid) {
// Skip entirely the flush if the trace session doesn't exist anymore.
// This is to prevent misleading error messages to be logged.
//
// if the trace has started from the trigger we rely on
// the |stop_delay_ms| from the trigger so don't flush and
// disable if we've moved beyond a CONFIGURED state
auto* tracing_session_ptr = GetTracingSession(tsid);
if (tracing_session_ptr &&
tracing_session_ptr->state == TracingSession::CONFIGURED) {
PERFETTO_DLOG("Disabling TracingSession %" PRIu64
" since no triggers activated.",
tsid);
// No data should be returned from ReadBuffers() regardless of if we
// call FreeBuffers() or DisableTracing(). This is because in
// STOP_TRACING we need this promise in either case, and using
// DisableTracing() allows a graceful shutdown. Consumers can follow
// their normal path and check the buffers through ReadBuffers() and
// the code won't hang because the tracing session will still be
// alive just disabled.
DisableTracing(tsid);
}
}
void TracingServiceImpl::UpdateMemoryGuardrail() {
#if PERFETTO_BUILDFLAG(PERFETTO_WATCHDOG)
uint64_t total_buffer_bytes = 0;
// Sum up all the shared memory buffers.
for (const auto& id_to_producer : producers_) {
if (id_to_producer.second->shared_memory())
total_buffer_bytes += id_to_producer.second->shared_memory()->size();
}
// Sum up all the trace buffers.
for (const auto& id_to_buffer : buffers_) {
total_buffer_bytes += id_to_buffer.second->size();
}
// Set the guard rail to 32MB + the sum of all the buffers over a 30 second
// interval.
uint64_t guardrail = base::kWatchdogDefaultMemorySlack + total_buffer_bytes;
base::Watchdog::GetInstance()->SetMemoryLimit(guardrail, 30 * 1000);
#endif
}
void TracingServiceImpl::PeriodicSnapshotTask(TracingSessionID tsid) {
auto* tracing_session = GetTracingSession(tsid);
if (!tracing_session)
return;
if (tracing_session->state != TracingSession::STARTED)
return;
tracing_session->should_emit_sync_marker = true;
tracing_session->should_emit_stats = true;
MaybeSnapshotClocksIntoRingBuffer(tracing_session);
}
void TracingServiceImpl::SnapshotLifecyleEvent(TracingSession* tracing_session,
uint32_t field_id,
bool snapshot_clocks) {
// field_id should be an id of a field in TracingServiceEvent.
auto& lifecycle_events = tracing_session->lifecycle_events;
auto event_it =
std::find_if(lifecycle_events.begin(), lifecycle_events.end(),
[field_id](const TracingSession::LifecycleEvent& event) {
return event.field_id == field_id;
});
TracingSession::LifecycleEvent* event;
if (event_it == lifecycle_events.end()) {
lifecycle_events.emplace_back(field_id);
event = &lifecycle_events.back();
} else {
event = &*event_it;
}
// Snapshot the clocks before capturing the timestamp for the event so we can
// use this snapshot to resolve the event timestamp if necessary.
if (snapshot_clocks)
MaybeSnapshotClocksIntoRingBuffer(tracing_session);
// Erase before emplacing to prevent a unncessary doubling of memory if
// not needed.
if (event->timestamps.size() >= event->max_size) {
event->timestamps.erase_front(1 + event->timestamps.size() -
event->max_size);
}
event->timestamps.emplace_back(base::GetBootTimeNs().count());
}
void TracingServiceImpl::MaybeSnapshotClocksIntoRingBuffer(
TracingSession* tracing_session) {
if (tracing_session->config.builtin_data_sources()
.disable_clock_snapshotting()) {
return;
}
// We are making an explicit copy of the latest snapshot (if it exists)
// because SnapshotClocks reads this data and computes the drift based on its
// content. If the clock drift is high enough, it will update the contents of
// |snapshot| and return true. Otherwise, it will return false.
TracingSession::ClockSnapshotData snapshot =
tracing_session->clock_snapshot_ring_buffer.empty()
? TracingSession::ClockSnapshotData()
: tracing_session->clock_snapshot_ring_buffer.back();
bool did_update = SnapshotClocks(&snapshot);
if (did_update) {
// This means clocks drifted enough since last snapshot. See the comment
// in SnapshotClocks.
auto* snapshot_buffer = &tracing_session->clock_snapshot_ring_buffer;
// Erase before emplacing to prevent a unncessary doubling of memory if
// not needed.
static constexpr uint32_t kClockSnapshotRingBufferSize = 16;
if (snapshot_buffer->size() >= kClockSnapshotRingBufferSize) {
snapshot_buffer->erase_front(1 + snapshot_buffer->size() -
kClockSnapshotRingBufferSize);
}
snapshot_buffer->emplace_back(std::move(snapshot));
}
}
// Returns true when the data in |snapshot_data| is updated with the new state
// of the clocks and false otherwise.
bool TracingServiceImpl::SnapshotClocks(
TracingSession::ClockSnapshotData* snapshot_data) {
// Minimum drift that justifies replacing a prior clock snapshot that hasn't
// been emitted into the trace yet (see comment below).
static constexpr int64_t kSignificantDriftNs = 10 * 1000 * 1000; // 10 ms
TracingSession::ClockSnapshotData new_snapshot_data;
#if !PERFETTO_BUILDFLAG(PERFETTO_OS_APPLE) && \
!PERFETTO_BUILDFLAG(PERFETTO_OS_WIN) && \
!PERFETTO_BUILDFLAG(PERFETTO_OS_NACL)
struct {
clockid_t id;
protos::pbzero::BuiltinClock type;
struct timespec ts;
} clocks[] = {
{CLOCK_BOOTTIME, protos::pbzero::BUILTIN_CLOCK_BOOTTIME, {0, 0}},
{CLOCK_REALTIME_COARSE,
protos::pbzero::BUILTIN_CLOCK_REALTIME_COARSE,
{0, 0}},
{CLOCK_MONOTONIC_COARSE,
protos::pbzero::BUILTIN_CLOCK_MONOTONIC_COARSE,
{0, 0}},
{CLOCK_REALTIME, protos::pbzero::BUILTIN_CLOCK_REALTIME, {0, 0}},
{CLOCK_MONOTONIC, protos::pbzero::BUILTIN_CLOCK_MONOTONIC, {0, 0}},
{CLOCK_MONOTONIC_RAW,
protos::pbzero::BUILTIN_CLOCK_MONOTONIC_RAW,
{0, 0}},
};
// First snapshot all the clocks as atomically as we can.
for (auto& clock : clocks) {
if (clock_gettime(clock.id, &clock.ts) == -1)
PERFETTO_DLOG("clock_gettime failed for clock %d", clock.id);
}
for (auto& clock : clocks) {
new_snapshot_data.push_back(std::make_pair(
static_cast<uint32_t>(clock.type),
static_cast<uint64_t>(base::FromPosixTimespec(clock.ts).count())));
}
#else // OS_APPLE || OS_WIN && OS_NACL
auto wall_time_ns = static_cast<uint64_t>(base::GetWallTimeNs().count());
// The default trace clock is boot time, so we always need to emit a path to
// it. However since we don't actually have a boot time source on these
// platforms, pretend that wall time equals boot time.
new_snapshot_data.push_back(
std::make_pair(protos::pbzero::BUILTIN_CLOCK_BOOTTIME, wall_time_ns));
new_snapshot_data.push_back(
std::make_pair(protos::pbzero::BUILTIN_CLOCK_MONOTONIC, wall_time_ns));
#endif
// If we're about to update a session's latest clock snapshot that hasn't been
// emitted into the trace yet, check whether the clocks have drifted enough to
// warrant overriding the current snapshot values. The older snapshot would be
// valid for a larger part of the currently buffered trace data because the
// clock sync protocol in trace processor uses the latest clock <= timestamp
// to translate times (see https://perfetto.dev/docs/concepts/clock-sync), so
// we try to keep it if we can.
if (!snapshot_data->empty()) {
PERFETTO_DCHECK(snapshot_data->size() == new_snapshot_data.size());
PERFETTO_DCHECK((*snapshot_data)[0].first ==
protos::gen::BUILTIN_CLOCK_BOOTTIME);
bool update_snapshot = false;
uint64_t old_boot_ns = (*snapshot_data)[0].second;
uint64_t new_boot_ns = new_snapshot_data[0].second;
int64_t boot_diff =
static_cast<int64_t>(new_boot_ns) - static_cast<int64_t>(old_boot_ns);
for (size_t i = 1; i < snapshot_data->size(); i++) {
uint64_t old_ns = (*snapshot_data)[i].second;
uint64_t new_ns = new_snapshot_data[i].second;
int64_t diff =
static_cast<int64_t>(new_ns) - static_cast<int64_t>(old_ns);
// Compare the boottime delta against the delta of this clock.
if (std::abs(boot_diff - diff) >= kSignificantDriftNs) {
update_snapshot = true;
break;
}
}
if (!update_snapshot)
return false;
snapshot_data->clear();
}
*snapshot_data = std::move(new_snapshot_data);
return true;
}
void TracingServiceImpl::EmitClockSnapshot(
TracingSession* tracing_session,
TracingSession::ClockSnapshotData snapshot_data,
std::vector<TracePacket>* packets) {
PERFETTO_DCHECK(!tracing_session->config.builtin_data_sources()
.disable_clock_snapshotting());
protozero::HeapBuffered<protos::pbzero::TracePacket> packet;
auto* snapshot = packet->set_clock_snapshot();
protos::gen::BuiltinClock trace_clock =
tracing_session->config.builtin_data_sources().primary_trace_clock();
if (!trace_clock)
trace_clock = protos::gen::BUILTIN_CLOCK_BOOTTIME;
snapshot->set_primary_trace_clock(
static_cast<protos::pbzero::BuiltinClock>(trace_clock));
for (auto& clock_id_and_ts : snapshot_data) {
auto* c = snapshot->add_clocks();
c->set_clock_id(clock_id_and_ts.first);
c->set_timestamp(clock_id_and_ts.second);
}
packet->set_trusted_uid(static_cast<int32_t>(uid_));
packet->set_trusted_packet_sequence_id(kServicePacketSequenceID);
SerializeAndAppendPacket(packets, packet.SerializeAsArray());
}
void TracingServiceImpl::EmitSyncMarker(std::vector<TracePacket>* packets) {
// The sync marks are used to tokenize large traces efficiently.
// See description in trace_packet.proto.
if (sync_marker_packet_size_ == 0) {
// The marker ABI expects that the marker is written after the uid.
// Protozero guarantees that fields are written in the same order of the
// calls. The ResynchronizeTraceStreamUsingSyncMarker test verifies the ABI.
protozero::StaticBuffered<protos::pbzero::TracePacket> packet(
&sync_marker_packet_[0], sizeof(sync_marker_packet_));
packet->set_trusted_uid(static_cast<int32_t>(uid_));
packet->set_trusted_packet_sequence_id(kServicePacketSequenceID);
// Keep this last.
packet->set_synchronization_marker(kSyncMarker, sizeof(kSyncMarker));
sync_marker_packet_size_ = packet.Finalize();
}
packets->emplace_back();
packets->back().AddSlice(&sync_marker_packet_[0], sync_marker_packet_size_);
}
void TracingServiceImpl::EmitStats(TracingSession* tracing_session,
std::vector<TracePacket>* packets) {
protozero::HeapBuffered<protos::pbzero::TracePacket> packet;
packet->set_trusted_uid(static_cast<int32_t>(uid_));
packet->set_trusted_packet_sequence_id(kServicePacketSequenceID);
GetTraceStats(tracing_session).Serialize(packet->set_trace_stats());
SerializeAndAppendPacket(packets, packet.SerializeAsArray());
}
TraceStats TracingServiceImpl::GetTraceStats(TracingSession* tracing_session) {
TraceStats trace_stats;
trace_stats.set_producers_connected(static_cast<uint32_t>(producers_.size()));
trace_stats.set_producers_seen(last_producer_id_);
trace_stats.set_data_sources_registered(
static_cast<uint32_t>(data_sources_.size()));
trace_stats.set_data_sources_seen(last_data_source_instance_id_);
trace_stats.set_tracing_sessions(
static_cast<uint32_t>(tracing_sessions_.size()));
trace_stats.set_total_buffers(static_cast<uint32_t>(buffers_.size()));
trace_stats.set_chunks_discarded(chunks_discarded_);
trace_stats.set_patches_discarded(patches_discarded_);
trace_stats.set_invalid_packets(tracing_session->invalid_packets);
trace_stats.set_flushes_requested(tracing_session->flushes_requested);
trace_stats.set_flushes_succeeded(tracing_session->flushes_succeeded);
trace_stats.set_flushes_failed(tracing_session->flushes_failed);
trace_stats.set_final_flush_outcome(tracing_session->final_flush_outcome);
if (tracing_session->trace_filter) {
auto* filt_stats = trace_stats.mutable_filter_stats();
filt_stats->set_input_packets(tracing_session->filter_input_packets);
filt_stats->set_input_bytes(tracing_session->filter_input_bytes);
filt_stats->set_output_bytes(tracing_session->filter_output_bytes);
filt_stats->set_errors(tracing_session->filter_errors);
}
for (BufferID buf_id : tracing_session->buffers_index) {
TraceBuffer* buf = GetBufferByID(buf_id);
if (!buf) {
PERFETTO_DFATAL("Buffer not found.");
continue;
}
*trace_stats.add_buffer_stats() = buf->stats();
} // for (buf in session).
if (!tracing_session->config.builtin_data_sources()
.disable_chunk_usage_histograms()) {
// Emit chunk usage stats broken down by sequence ID (i.e. by trace-writer).
// Writer stats are updated by each TraceBuffer object at ReadBuffers time,
// and there can be >1 buffer per session. However, we want to report only
// one histogram per writer. A trace writer never writes to more than one
// buffer (it's technically allowed but doesn't happen in the current impl
// of the tracing SDK). Per-buffer breakdowns would be completely useless.
TraceBuffer::WriterStatsMap merged_stats;
// First merge all the per-buffer histograms into one-per-writer.
for (const BufferID buf_id : tracing_session->buffers_index) {
const TraceBuffer* buf = GetBufferByID(buf_id);
if (!buf)
continue;
for (auto it = buf->writer_stats().GetIterator(); it; ++it) {
auto& hist = merged_stats.Insert(it.key(), {}).first->used_chunk_hist;
hist.Merge(it.value().used_chunk_hist);
}
}
// Serialize the merged per-writer histogram into the stats proto.
bool has_written_bucket_definition = false;
for (auto it = merged_stats.GetIterator(); it; ++it) {
const auto& hist = it.value().used_chunk_hist;
ProducerID p;
WriterID w;
GetProducerAndWriterID(it.key(), &p, &w);
if (!has_written_bucket_definition) {
// Serialize one-off the histogram bucket definition, which is the same
// for all entries in the map.
has_written_bucket_definition = true;
// The -1 in the for loop below is to skip the implicit overflow bucket.
for (size_t i = 0; i < hist.num_buckets() - 1; ++i) {
trace_stats.add_chunk_payload_histogram_def(hist.GetBucketThres(i));
}
}
auto* wri_stats = trace_stats.add_writer_stats();
wri_stats->set_sequence_id(tracing_session->GetPacketSequenceID(p, w));
for (size_t i = 0; i < hist.num_buckets(); ++i) {
wri_stats->add_chunk_payload_histogram_counts(hist.GetBucketCount(i));
wri_stats->add_chunk_payload_histogram_sum(hist.GetBucketSum(i));
}
} // for (writer in merged_stats.GetIterator())
} // if (!disable_chunk_usage_histograms)
return trace_stats;
}
void TracingServiceImpl::MaybeEmitUuidAndTraceConfig(
TracingSession* tracing_session,
std::vector<TracePacket>* packets) {
if (tracing_session->did_emit_config)
return;
tracing_session->did_emit_config = true;
{
protozero::HeapBuffered<protos::pbzero::TracePacket> packet;
packet->set_trusted_uid(static_cast<int32_t>(uid_));
packet->set_trusted_packet_sequence_id(kServicePacketSequenceID);
auto* uuid = packet->set_trace_uuid();
uuid->set_lsb(tracing_session->trace_uuid.lsb());
uuid->set_msb(tracing_session->trace_uuid.msb());
SerializeAndAppendPacket(packets, packet.SerializeAsArray());
}
{
protozero::HeapBuffered<protos::pbzero::TracePacket> packet;
packet->set_trusted_uid(static_cast<int32_t>(uid_));
packet->set_trusted_packet_sequence_id(kServicePacketSequenceID);
tracing_session->config.Serialize(packet->set_trace_config());
SerializeAndAppendPacket(packets, packet.SerializeAsArray());
}
}
void TracingServiceImpl::MaybeEmitSystemInfo(
TracingSession* tracing_session,
std::vector<TracePacket>* packets) {
if (tracing_session->did_emit_system_info)
return;
tracing_session->did_emit_system_info = true;
protozero::HeapBuffered<protos::pbzero::TracePacket> packet;
auto* info = packet->set_system_info();
info->set_tracing_service_version(base::GetVersionString());
#if !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN) && \
!PERFETTO_BUILDFLAG(PERFETTO_OS_NACL)
struct utsname uname_info;
if (uname(&uname_info) == 0) {
auto* utsname_info = info->set_utsname();
utsname_info->set_sysname(uname_info.sysname);
utsname_info->set_version(uname_info.version);
utsname_info->set_machine(uname_info.machine);
utsname_info->set_release(uname_info.release);
}
#endif // !PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
#if PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
std::string fingerprint_value = base::GetAndroidProp("ro.build.fingerprint");
if (!fingerprint_value.empty()) {
info->set_android_build_fingerprint(fingerprint_value);
} else {
PERFETTO_ELOG("Unable to read ro.build.fingerprint");
}
std::string sdk_str_value = base::GetAndroidProp("ro.build.version.sdk");
std::optional<uint64_t> sdk_value = base::StringToUInt64(sdk_str_value);
if (sdk_value.has_value()) {
info->set_android_sdk_version(*sdk_value);
} else {
PERFETTO_ELOG("Unable to read ro.build.version.sdk");
}
info->set_hz(sysconf(_SC_CLK_TCK));
info->set_page_size(static_cast<uint32_t>(sysconf(_SC_PAGESIZE)));
#endif // PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
packet->set_trusted_uid(static_cast<int32_t>(uid_));
packet->set_trusted_packet_sequence_id(kServicePacketSequenceID);
SerializeAndAppendPacket(packets, packet.SerializeAsArray());
}
void TracingServiceImpl::EmitLifecycleEvents(
TracingSession* tracing_session,
std::vector<TracePacket>* packets) {
using TimestampedPacket =
std::pair<int64_t /* ts */, std::vector<uint8_t> /* serialized packet */>;
std::vector<TimestampedPacket> timestamped_packets;
for (auto& event : tracing_session->lifecycle_events) {
for (int64_t ts : event.timestamps) {
protozero::HeapBuffered<protos::pbzero::TracePacket> packet;
packet->set_timestamp(static_cast<uint64_t>(ts));
packet->set_trusted_uid(static_cast<int32_t>(uid_));
packet->set_trusted_packet_sequence_id(kServicePacketSequenceID);
auto* service_event = packet->set_service_event();
service_event->AppendVarInt(event.field_id, 1);
timestamped_packets.emplace_back(ts, packet.SerializeAsArray());
}
event.timestamps.clear();
}
// We sort by timestamp here to ensure that the "sequence" of lifecycle
// packets has monotonic timestamps like other sequences in the trace.
// Note that these events could still be out of order with respect to other
// events on the service packet sequence (e.g. trigger received packets).
std::sort(timestamped_packets.begin(), timestamped_packets.end(),
[](const TimestampedPacket& a, const TimestampedPacket& b) {
return a.first < b.first;
});
for (const auto& pair : timestamped_packets)
SerializeAndAppendPacket(packets, std::move(pair.second));
}
void TracingServiceImpl::MaybeEmitReceivedTriggers(
TracingSession* tracing_session,
std::vector<TracePacket>* packets) {
PERFETTO_DCHECK(tracing_session->num_triggers_emitted_into_trace <=
tracing_session->received_triggers.size());
for (size_t i = tracing_session->num_triggers_emitted_into_trace;
i < tracing_session->received_triggers.size(); ++i) {
const auto& info = tracing_session->received_triggers[i];
protozero::HeapBuffered<protos::pbzero::TracePacket> packet;
auto* trigger = packet->set_trigger();
trigger->set_trigger_name(info.trigger_name);
trigger->set_producer_name(info.producer_name);
trigger->set_trusted_producer_uid(static_cast<int32_t>(info.producer_uid));
packet->set_timestamp(info.boot_time_ns);
packet->set_trusted_uid(static_cast<int32_t>(uid_));
packet->set_trusted_packet_sequence_id(kServicePacketSequenceID);
SerializeAndAppendPacket(packets, packet.SerializeAsArray());
++tracing_session->num_triggers_emitted_into_trace;
}
}
void TracingServiceImpl::MaybeLogUploadEvent(const TraceConfig& cfg,
const base::Uuid& uuid,
PerfettoStatsdAtom atom,
const std::string& trigger_name) {
if (!ShouldLogEvent(cfg))
return;
PERFETTO_DCHECK(uuid); // The UUID must be set at this point.
android_stats::MaybeLogUploadEvent(atom, uuid.lsb(), uuid.msb(),
trigger_name);
}
void TracingServiceImpl::MaybeLogTriggerEvent(const TraceConfig& cfg,
PerfettoTriggerAtom atom,
const std::string& trigger_name) {
if (!ShouldLogEvent(cfg))
return;
android_stats::MaybeLogTriggerEvent(atom, trigger_name);
}
size_t TracingServiceImpl::PurgeExpiredAndCountTriggerInWindow(
int64_t now_ns,
uint64_t trigger_name_hash) {
PERFETTO_DCHECK(
std::is_sorted(trigger_history_.begin(), trigger_history_.end()));
size_t remove_count = 0;
size_t trigger_count = 0;
for (const TriggerHistory& h : trigger_history_) {
if (h.timestamp_ns < now_ns - trigger_window_ns_) {
remove_count++;
} else if (h.name_hash == trigger_name_hash) {
trigger_count++;
}
}
trigger_history_.erase_front(remove_count);
return trigger_count;
}
void TracingServiceImpl::FlushAndCloneSession(ConsumerEndpointImpl* consumer,
TracingSessionID tsid) {
PERFETTO_DCHECK_THREAD(thread_checker_);
if (tsid == kBugreportSessionId) {
TracingSession* session = FindTracingSessionWithMaxBugreportScore();
if (!session) {
consumer->consumer_->OnSessionCloned(
false, "No tracing sessions eligible for bugreport found");
return;
}
tsid = session->id;
}
auto weak_this = weak_ptr_factory_.GetWeakPtr();
auto weak_consumer = consumer->GetWeakPtr();
Flush(tsid, 0, [weak_this, tsid, weak_consumer](bool final_flush_outcome) {
PERFETTO_LOG("FlushAndCloneSession(%" PRIu64 ") started, success=%d", tsid,
final_flush_outcome);
if (!weak_this || !weak_consumer)
return;
base::Status result =
weak_this->DoCloneSession(&*weak_consumer, tsid, final_flush_outcome);
weak_consumer->consumer_->OnSessionCloned(result.ok(), result.message());
});
}
base::Status TracingServiceImpl::DoCloneSession(ConsumerEndpointImpl* consumer,
TracingSessionID src_tsid,
bool final_flush_outcome) {
PERFETTO_DLOG("CloneSession(%" PRIu64 ") started, consumer uid: %d", src_tsid,
static_cast<int>(consumer->uid_));
TracingSession* src = GetTracingSession(src_tsid);
// The session might be gone by the time we try to clone it.
if (!src)
return PERFETTO_SVC_ERR("session not found");
if (consumer->tracing_session_id_) {
return PERFETTO_SVC_ERR(
"The consumer is already attached to another tracing session");
}
if (src->consumer_uid != consumer->uid_ && consumer->uid_ != 0)
return PERFETTO_SVC_ERR("Not allowed to clone a session from another UID");
// First clone all TraceBuffer(s). This can fail because of ENOMEM. If it
// happens bail out early before creating any session.
std::vector<std::pair<BufferID, std::unique_ptr<TraceBuffer>>> buf_snaps;
buf_snaps.reserve(src->num_buffers());
bool buf_clone_failed = false;
for (BufferID src_buf_id : src->buffers_index) {
TraceBuffer* src_buf = GetBufferByID(src_buf_id);
std::unique_ptr<TraceBuffer> buf_snap = src_buf->CloneReadOnly();
BufferID buf_global_id = buffer_ids_.Allocate();
buf_clone_failed |= !buf_snap.get() || !buf_global_id;
buf_snaps.emplace_back(buf_global_id, std::move(buf_snap));
}
// Free up allocated IDs in case of failure. No need to free the TraceBuffers,
// as they are still owned by the temporary |buf_snaps|.
if (buf_clone_failed) {
for (auto& kv : buf_snaps) {
if (kv.first)
buffer_ids_.Free(kv.first);
}
return PERFETTO_SVC_ERR("Buffer allocation failed");
}
const TracingSessionID tsid = ++last_tracing_session_id_;
TracingSession* cloned_session =
&tracing_sessions_
.emplace(
std::piecewise_construct, std::forward_as_tuple(tsid),
std::forward_as_tuple(tsid, consumer, src->config, task_runner_))
.first->second;
cloned_session->state = TracingSession::CLONED_READ_ONLY;
cloned_session->trace_uuid = base::Uuidv4(); // Generate a new UUID.
for (auto& kv : buf_snaps) {
BufferID buf_global_id = kv.first;
std::unique_ptr<TraceBuffer>& buf = kv.second;
buffers_.emplace(buf_global_id, std::move(buf));
cloned_session->buffers_index.emplace_back(buf_global_id);
}
UpdateMemoryGuardrail();
// Copy over relevant state that we want to persist in the cloned session.
// Mostly stats and metadata that is emitted in the trace file by the service.
cloned_session->received_triggers = src->received_triggers;
cloned_session->lifecycle_events =
std::vector<TracingSession::LifecycleEvent>(src->lifecycle_events);
cloned_session->initial_clock_snapshot = src->initial_clock_snapshot;
cloned_session->clock_snapshot_ring_buffer = src->clock_snapshot_ring_buffer;
cloned_session->invalid_packets = src->invalid_packets;
cloned_session->flushes_requested = src->flushes_requested;
cloned_session->flushes_succeeded = src->flushes_succeeded;
cloned_session->flushes_failed = src->flushes_failed;
if (src->trace_filter) {
// Copy the trace filter.
cloned_session->trace_filter.reset(
new protozero::MessageFilter(*src->trace_filter));
}
SnapshotLifecyleEvent(
cloned_session,
protos::pbzero::TracingServiceEvent::kTracingDisabledFieldNumber,
true /* snapshot_clocks */);
PERFETTO_DLOG("Consumer (uid:%d) cloned tracing session %" PRIu64
" -> %" PRIu64,
static_cast<int>(consumer->uid_), src_tsid, tsid);
consumer->tracing_session_id_ = tsid;
cloned_session->final_flush_outcome = final_flush_outcome
? TraceStats::FINAL_FLUSH_SUCCEEDED
: TraceStats::FINAL_FLUSH_FAILED;
return base::OkStatus();
}
////////////////////////////////////////////////////////////////////////////////
// TracingServiceImpl::ConsumerEndpointImpl implementation
////////////////////////////////////////////////////////////////////////////////
TracingServiceImpl::ConsumerEndpointImpl::ConsumerEndpointImpl(
TracingServiceImpl* service,
base::TaskRunner* task_runner,
Consumer* consumer,
uid_t uid)
: task_runner_(task_runner),
service_(service),
consumer_(consumer),
uid_(uid),
weak_ptr_factory_(this) {}
TracingServiceImpl::ConsumerEndpointImpl::~ConsumerEndpointImpl() {
service_->DisconnectConsumer(this);
consumer_->OnDisconnect();
}
void TracingServiceImpl::ConsumerEndpointImpl::NotifyOnTracingDisabled(
const std::string& error) {
PERFETTO_DCHECK_THREAD(thread_checker_);
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this, error /* deliberate copy */] {
if (weak_this)
weak_this->consumer_->OnTracingDisabled(error);
});
}
void TracingServiceImpl::ConsumerEndpointImpl::EnableTracing(
const TraceConfig& cfg,
base::ScopedFile fd) {
PERFETTO_DCHECK_THREAD(thread_checker_);
auto status = service_->EnableTracing(this, cfg, std::move(fd));
if (!status.ok())
NotifyOnTracingDisabled(status.message());
}
void TracingServiceImpl::ConsumerEndpointImpl::ChangeTraceConfig(
const TraceConfig& cfg) {
if (!tracing_session_id_) {
PERFETTO_LOG(
"Consumer called ChangeTraceConfig() but tracing was "
"not active");
return;
}
service_->ChangeTraceConfig(this, cfg);
}
void TracingServiceImpl::ConsumerEndpointImpl::StartTracing() {
PERFETTO_DCHECK_THREAD(thread_checker_);
if (!tracing_session_id_) {
PERFETTO_LOG("Consumer called StartTracing() but tracing was not active");
return;
}
service_->StartTracing(tracing_session_id_);
}
void TracingServiceImpl::ConsumerEndpointImpl::DisableTracing() {
PERFETTO_DCHECK_THREAD(thread_checker_);
if (!tracing_session_id_) {
PERFETTO_LOG("Consumer called DisableTracing() but tracing was not active");
return;
}
service_->DisableTracing(tracing_session_id_);
}
void TracingServiceImpl::ConsumerEndpointImpl::ReadBuffers() {
PERFETTO_DCHECK_THREAD(thread_checker_);
if (!tracing_session_id_) {
PERFETTO_LOG("Consumer called ReadBuffers() but tracing was not active");
consumer_->OnTraceData({}, /* has_more = */ false);
return;
}
if (!service_->ReadBuffersIntoConsumer(tracing_session_id_, this)) {
consumer_->OnTraceData({}, /* has_more = */ false);
}
}
void TracingServiceImpl::ConsumerEndpointImpl::FreeBuffers() {
PERFETTO_DCHECK_THREAD(thread_checker_);
if (!tracing_session_id_) {
PERFETTO_LOG("Consumer called FreeBuffers() but tracing was not active");
return;
}
service_->FreeBuffers(tracing_session_id_);
tracing_session_id_ = 0;
}
void TracingServiceImpl::ConsumerEndpointImpl::Flush(uint32_t timeout_ms,
FlushCallback callback) {
PERFETTO_DCHECK_THREAD(thread_checker_);
if (!tracing_session_id_) {
PERFETTO_LOG("Consumer called Flush() but tracing was not active");
return;
}
service_->Flush(tracing_session_id_, timeout_ms, callback);
}
void TracingServiceImpl::ConsumerEndpointImpl::Detach(const std::string& key) {
PERFETTO_DCHECK_THREAD(thread_checker_);
bool success = service_->DetachConsumer(this, key);
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this, success] {
if (weak_this)
weak_this->consumer_->OnDetach(success);
});
}
void TracingServiceImpl::ConsumerEndpointImpl::Attach(const std::string& key) {
PERFETTO_DCHECK_THREAD(thread_checker_);
bool success = service_->AttachConsumer(this, key);
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this, success] {
if (!weak_this)
return;
Consumer* consumer = weak_this->consumer_;
TracingSession* session =
weak_this->service_->GetTracingSession(weak_this->tracing_session_id_);
if (!session) {
consumer->OnAttach(false, TraceConfig());
return;
}
consumer->OnAttach(success, session->config);
});
}
void TracingServiceImpl::ConsumerEndpointImpl::GetTraceStats() {
PERFETTO_DCHECK_THREAD(thread_checker_);
bool success = false;
TraceStats stats;
TracingSession* session = service_->GetTracingSession(tracing_session_id_);
if (session) {
success = true;
stats = service_->GetTraceStats(session);
}
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this, success, stats] {
if (weak_this)
weak_this->consumer_->OnTraceStats(success, stats);
});
}
void TracingServiceImpl::ConsumerEndpointImpl::ObserveEvents(
uint32_t events_mask) {
PERFETTO_DCHECK_THREAD(thread_checker_);
observable_events_mask_ = events_mask;
TracingSession* session = service_->GetTracingSession(tracing_session_id_);
if (!session)
return;
if (observable_events_mask_ & ObservableEvents::TYPE_DATA_SOURCES_INSTANCES) {
// Issue initial states.
for (const auto& kv : session->data_source_instances) {
ProducerEndpointImpl* producer = service_->GetProducer(kv.first);
PERFETTO_DCHECK(producer);
OnDataSourceInstanceStateChange(*producer, kv.second);
}
}
// If the ObserveEvents() call happens after data sources have acked already
// notify immediately.
if (observable_events_mask_ &
ObservableEvents::TYPE_ALL_DATA_SOURCES_STARTED) {
service_->MaybeNotifyAllDataSourcesStarted(session);
}
}
void TracingServiceImpl::ConsumerEndpointImpl::OnDataSourceInstanceStateChange(
const ProducerEndpointImpl& producer,
const DataSourceInstance& instance) {
if (!(observable_events_mask_ &
ObservableEvents::TYPE_DATA_SOURCES_INSTANCES)) {
return;
}
if (instance.state != DataSourceInstance::CONFIGURED &&
instance.state != DataSourceInstance::STARTED &&
instance.state != DataSourceInstance::STOPPED) {
return;
}
auto* observable_events = AddObservableEvents();
auto* change = observable_events->add_instance_state_changes();
change->set_producer_name(producer.name_);
change->set_data_source_name(instance.data_source_name);
if (instance.state == DataSourceInstance::STARTED) {
change->set_state(ObservableEvents::DATA_SOURCE_INSTANCE_STATE_STARTED);
} else {
change->set_state(ObservableEvents::DATA_SOURCE_INSTANCE_STATE_STOPPED);
}
}
void TracingServiceImpl::ConsumerEndpointImpl::OnAllDataSourcesStarted() {
if (!(observable_events_mask_ &
ObservableEvents::TYPE_ALL_DATA_SOURCES_STARTED)) {
return;
}
auto* observable_events = AddObservableEvents();
observable_events->set_all_data_sources_started(true);
}
ObservableEvents*
TracingServiceImpl::ConsumerEndpointImpl::AddObservableEvents() {
PERFETTO_DCHECK_THREAD(thread_checker_);
if (!observable_events_) {
observable_events_.reset(new ObservableEvents());
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this] {
if (!weak_this)
return;
// Move into a temporary to allow reentrancy in OnObservableEvents.
auto observable_events = std::move(weak_this->observable_events_);
weak_this->consumer_->OnObservableEvents(*observable_events);
});
}
return observable_events_.get();
}
void TracingServiceImpl::ConsumerEndpointImpl::QueryServiceState(
QueryServiceStateCallback callback) {
PERFETTO_DCHECK_THREAD(thread_checker_);
TracingServiceState svc_state;
const auto& sessions = service_->tracing_sessions_;
svc_state.set_tracing_service_version(base::GetVersionString());
svc_state.set_num_sessions(static_cast<int>(sessions.size()));
int num_started = 0;
for (const auto& kv : sessions)
num_started += kv.second.state == TracingSession::State::STARTED ? 1 : 0;
svc_state.set_num_sessions_started(static_cast<int>(num_started));
for (const auto& kv : service_->producers_) {
auto* producer = svc_state.add_producers();
producer->set_id(static_cast<int>(kv.first));
producer->set_name(kv.second->name_);
producer->set_sdk_version(kv.second->sdk_version_);
producer->set_uid(static_cast<int32_t>(kv.second->uid()));
producer->set_pid(static_cast<int32_t>(kv.second->pid()));
}
for (const auto& kv : service_->data_sources_) {
const auto& registered_data_source = kv.second;
auto* data_source = svc_state.add_data_sources();
*data_source->mutable_ds_descriptor() = registered_data_source.descriptor;
data_source->set_producer_id(
static_cast<int>(registered_data_source.producer_id));
}
svc_state.set_supports_tracing_sessions(true);
for (const auto& kv : service_->tracing_sessions_) {
const TracingSession& s = kv.second;
// List only tracing sessions for the calling UID (or everything for root).
if (uid_ != 0 && uid_ != s.consumer_uid)
continue;
auto* session = svc_state.add_tracing_sessions();
session->set_id(s.id);
session->set_consumer_uid(static_cast<int>(s.consumer_uid));
session->set_duration_ms(s.config.duration_ms());
session->set_num_data_sources(
static_cast<uint32_t>(s.data_source_instances.size()));
session->set_unique_session_name(s.config.unique_session_name());
for (const auto& snap_kv : s.initial_clock_snapshot) {
if (snap_kv.first == protos::pbzero::BUILTIN_CLOCK_REALTIME)
session->set_start_realtime_ns(static_cast<int64_t>(snap_kv.second));
}
for (const auto& buf : s.config.buffers())
session->add_buffer_size_kb(buf.size_kb());
switch (s.state) {
case TracingSession::State::DISABLED:
session->set_state("DISABLED");
break;
case TracingSession::State::CONFIGURED:
session->set_state("CONFIGURED");
break;
case TracingSession::State::STARTED:
session->set_state("STARTED");
break;
case TracingSession::State::DISABLING_WAITING_STOP_ACKS:
session->set_state("STOP_WAIT");
break;
case TracingSession::State::CLONED_READ_ONLY:
session->set_state("CLONED_READ_ONLY");
break;
}
}
callback(/*success=*/true, svc_state);
}
void TracingServiceImpl::ConsumerEndpointImpl::QueryCapabilities(
QueryCapabilitiesCallback callback) {
PERFETTO_DCHECK_THREAD(thread_checker_);
TracingServiceCapabilities caps;
caps.set_has_query_capabilities(true);
caps.set_has_trace_config_output_path(true);
caps.add_observable_events(ObservableEvents::TYPE_DATA_SOURCES_INSTANCES);
caps.add_observable_events(ObservableEvents::TYPE_ALL_DATA_SOURCES_STARTED);
static_assert(ObservableEvents::Type_MAX ==
ObservableEvents::TYPE_ALL_DATA_SOURCES_STARTED,
"");
callback(caps);
}
void TracingServiceImpl::ConsumerEndpointImpl::SaveTraceForBugreport(
SaveTraceForBugreportCallback consumer_callback) {
consumer_callback(false,
"SaveTraceForBugreport is deprecated. Use "
"CloneSession(kBugreportSessionId) instead.");
}
void TracingServiceImpl::ConsumerEndpointImpl::CloneSession(
TracingSessionID tsid) {
PERFETTO_DCHECK_THREAD(thread_checker_);
// FlushAndCloneSession will call OnSessionCloned after the async flush.
service_->FlushAndCloneSession(this, tsid);
}
////////////////////////////////////////////////////////////////////////////////
// TracingServiceImpl::ProducerEndpointImpl implementation
////////////////////////////////////////////////////////////////////////////////
TracingServiceImpl::ProducerEndpointImpl::ProducerEndpointImpl(
ProducerID id,
uid_t uid,
pid_t pid,
TracingServiceImpl* service,
base::TaskRunner* task_runner,
Producer* producer,
const std::string& producer_name,
const std::string& sdk_version,
bool in_process,
bool smb_scraping_enabled)
: id_(id),
uid_(uid),
pid_(pid),
service_(service),
task_runner_(task_runner),
producer_(producer),
name_(producer_name),
sdk_version_(sdk_version),
in_process_(in_process),
smb_scraping_enabled_(smb_scraping_enabled),
weak_ptr_factory_(this) {}
TracingServiceImpl::ProducerEndpointImpl::~ProducerEndpointImpl() {
service_->DisconnectProducer(id_);
producer_->OnDisconnect();
}
void TracingServiceImpl::ProducerEndpointImpl::Disconnect() {
PERFETTO_DCHECK_THREAD(thread_checker_);
// Disconnection is only supported via destroying the ProducerEndpoint.
PERFETTO_FATAL("Not supported");
}
void TracingServiceImpl::ProducerEndpointImpl::RegisterDataSource(
const DataSourceDescriptor& desc) {
PERFETTO_DCHECK_THREAD(thread_checker_);
service_->RegisterDataSource(id_, desc);
}
void TracingServiceImpl::ProducerEndpointImpl::UpdateDataSource(
const DataSourceDescriptor& desc) {
PERFETTO_DCHECK_THREAD(thread_checker_);
service_->UpdateDataSource(id_, desc);
}
void TracingServiceImpl::ProducerEndpointImpl::UnregisterDataSource(
const std::string& name) {
PERFETTO_DCHECK_THREAD(thread_checker_);
service_->UnregisterDataSource(id_, name);
}
void TracingServiceImpl::ProducerEndpointImpl::RegisterTraceWriter(
uint32_t writer_id,
uint32_t target_buffer) {
PERFETTO_DCHECK_THREAD(thread_checker_);
writers_[static_cast<WriterID>(writer_id)] =
static_cast<BufferID>(target_buffer);
}
void TracingServiceImpl::ProducerEndpointImpl::UnregisterTraceWriter(
uint32_t writer_id) {
PERFETTO_DCHECK_THREAD(thread_checker_);
writers_.erase(static_cast<WriterID>(writer_id));
}
void TracingServiceImpl::ProducerEndpointImpl::CommitData(
const CommitDataRequest& req_untrusted,
CommitDataCallback callback) {
PERFETTO_DCHECK_THREAD(thread_checker_);
if (metatrace::IsEnabled(metatrace::TAG_TRACE_SERVICE)) {
PERFETTO_METATRACE_COUNTER(TAG_TRACE_SERVICE, TRACE_SERVICE_COMMIT_DATA,
EncodeCommitDataRequest(id_, req_untrusted));
}
if (!shared_memory_) {
PERFETTO_DLOG(
"Attempted to commit data before the shared memory was allocated.");
return;
}
PERFETTO_DCHECK(shmem_abi_.is_valid());
for (const auto& entry : req_untrusted.chunks_to_move()) {
const uint32_t page_idx = entry.page();
if (page_idx >= shmem_abi_.num_pages())
continue; // A buggy or malicious producer.
SharedMemoryABI::Chunk chunk =
shmem_abi_.TryAcquireChunkForReading(page_idx, entry.chunk());
if (!chunk.is_valid()) {
PERFETTO_DLOG("Asked to move chunk %d:%d, but it's not complete",
entry.page(), entry.chunk());
continue;
}
// TryAcquireChunkForReading() has load-acquire semantics. Once acquired,
// the ABI contract expects the producer to not touch the chunk anymore
// (until the service marks that as free). This is why all the reads below
// are just memory_order_relaxed. Also, the code here assumes that all this
// data can be malicious and just gives up if anything is malformed.
BufferID buffer_id = static_cast<BufferID>(entry.target_buffer());
const SharedMemoryABI::ChunkHeader& chunk_header = *chunk.header();
WriterID writer_id = chunk_header.writer_id.load(std::memory_order_relaxed);
ChunkID chunk_id = chunk_header.chunk_id.load(std::memory_order_relaxed);
auto packets = chunk_header.packets.load(std::memory_order_relaxed);
uint16_t num_fragments = packets.count;
uint8_t chunk_flags = packets.flags;
service_->CopyProducerPageIntoLogBuffer(
id_, uid_, pid_, writer_id, chunk_id, buffer_id, num_fragments,
chunk_flags,
/*chunk_complete=*/true, chunk.payload_begin(), chunk.payload_size());
// This one has release-store semantics.
shmem_abi_.ReleaseChunkAsFree(std::move(chunk));
} // for(chunks_to_move)
service_->ApplyChunkPatches(id_, req_untrusted.chunks_to_patch());
if (req_untrusted.flush_request_id()) {
service_->NotifyFlushDoneForProducer(id_, req_untrusted.flush_request_id());
}
// Keep this invocation last. ProducerIPCService::CommitData() relies on this
// callback being invoked within the same callstack and not posted. If this
// changes, the code there needs to be changed accordingly.
if (callback)
callback();
}
void TracingServiceImpl::ProducerEndpointImpl::SetupSharedMemory(
std::unique_ptr<SharedMemory> shared_memory,
size_t page_size_bytes,
bool provided_by_producer) {
PERFETTO_DCHECK(!shared_memory_ && !shmem_abi_.is_valid());
PERFETTO_DCHECK(page_size_bytes % 1024 == 0);
shared_memory_ = std::move(shared_memory);
shared_buffer_page_size_kb_ = page_size_bytes / 1024;
is_shmem_provided_by_producer_ = provided_by_producer;
shmem_abi_.Initialize(reinterpret_cast<uint8_t*>(shared_memory_->start()),
shared_memory_->size(),
shared_buffer_page_size_kb() * 1024);
if (in_process_) {
inproc_shmem_arbiter_.reset(new SharedMemoryArbiterImpl(
shared_memory_->start(), shared_memory_->size(),
shared_buffer_page_size_kb_ * 1024, this, task_runner_));
inproc_shmem_arbiter_->SetDirectSMBPatchingSupportedByService();
}
OnTracingSetup();
service_->UpdateMemoryGuardrail();
}
SharedMemory* TracingServiceImpl::ProducerEndpointImpl::shared_memory() const {
PERFETTO_DCHECK_THREAD(thread_checker_);
return shared_memory_.get();
}
size_t TracingServiceImpl::ProducerEndpointImpl::shared_buffer_page_size_kb()
const {
return shared_buffer_page_size_kb_;
}
void TracingServiceImpl::ProducerEndpointImpl::ActivateTriggers(
const std::vector<std::string>& triggers) {
service_->ActivateTriggers(id_, triggers);
}
void TracingServiceImpl::ProducerEndpointImpl::StopDataSource(
DataSourceInstanceID ds_inst_id) {
// TODO(primiano): When we'll support tearing down the SMB, at this point we
// should send the Producer a TearDownTracing if all its data sources have
// been disabled (see b/77532839 and aosp/655179 PS1).
PERFETTO_DCHECK_THREAD(thread_checker_);
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this, ds_inst_id] {
if (weak_this)
weak_this->producer_->StopDataSource(ds_inst_id);
});
}
SharedMemoryArbiter*
TracingServiceImpl::ProducerEndpointImpl::MaybeSharedMemoryArbiter() {
if (!inproc_shmem_arbiter_) {
PERFETTO_FATAL(
"The in-process SharedMemoryArbiter can only be used when "
"CreateProducer has been called with in_process=true and after tracing "
"has started.");
}
PERFETTO_DCHECK(in_process_);
return inproc_shmem_arbiter_.get();
}
bool TracingServiceImpl::ProducerEndpointImpl::IsShmemProvidedByProducer()
const {
return is_shmem_provided_by_producer_;
}
// Can be called on any thread.
std::unique_ptr<TraceWriter>
TracingServiceImpl::ProducerEndpointImpl::CreateTraceWriter(
BufferID buf_id,
BufferExhaustedPolicy buffer_exhausted_policy) {
PERFETTO_DCHECK(MaybeSharedMemoryArbiter());
return MaybeSharedMemoryArbiter()->CreateTraceWriter(buf_id,
buffer_exhausted_policy);
}
void TracingServiceImpl::ProducerEndpointImpl::NotifyFlushComplete(
FlushRequestID id) {
PERFETTO_DCHECK_THREAD(thread_checker_);
PERFETTO_DCHECK(MaybeSharedMemoryArbiter());
return MaybeSharedMemoryArbiter()->NotifyFlushComplete(id);
}
void TracingServiceImpl::ProducerEndpointImpl::OnTracingSetup() {
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this] {
if (weak_this)
weak_this->producer_->OnTracingSetup();
});
}
void TracingServiceImpl::ProducerEndpointImpl::Flush(
FlushRequestID flush_request_id,
const std::vector<DataSourceInstanceID>& data_sources) {
PERFETTO_DCHECK_THREAD(thread_checker_);
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this, flush_request_id, data_sources] {
if (weak_this) {
weak_this->producer_->Flush(flush_request_id, data_sources.data(),
data_sources.size());
}
});
}
void TracingServiceImpl::ProducerEndpointImpl::SetupDataSource(
DataSourceInstanceID ds_id,
const DataSourceConfig& config) {
PERFETTO_DCHECK_THREAD(thread_checker_);
allowed_target_buffers_.insert(static_cast<BufferID>(config.target_buffer()));
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this, ds_id, config] {
if (weak_this)
weak_this->producer_->SetupDataSource(ds_id, std::move(config));
});
}
void TracingServiceImpl::ProducerEndpointImpl::StartDataSource(
DataSourceInstanceID ds_id,
const DataSourceConfig& config) {
PERFETTO_DCHECK_THREAD(thread_checker_);
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this, ds_id, config] {
if (weak_this)
weak_this->producer_->StartDataSource(ds_id, std::move(config));
});
}
void TracingServiceImpl::ProducerEndpointImpl::NotifyDataSourceStarted(
DataSourceInstanceID data_source_id) {
PERFETTO_DCHECK_THREAD(thread_checker_);
service_->NotifyDataSourceStarted(id_, data_source_id);
}
void TracingServiceImpl::ProducerEndpointImpl::NotifyDataSourceStopped(
DataSourceInstanceID data_source_id) {
PERFETTO_DCHECK_THREAD(thread_checker_);
service_->NotifyDataSourceStopped(id_, data_source_id);
}
void TracingServiceImpl::ProducerEndpointImpl::OnFreeBuffers(
const std::vector<BufferID>& target_buffers) {
if (allowed_target_buffers_.empty())
return;
for (BufferID buffer : target_buffers)
allowed_target_buffers_.erase(buffer);
}
void TracingServiceImpl::ProducerEndpointImpl::ClearIncrementalState(
const std::vector<DataSourceInstanceID>& data_sources) {
PERFETTO_DCHECK_THREAD(thread_checker_);
auto weak_this = weak_ptr_factory_.GetWeakPtr();
task_runner_->PostTask([weak_this, data_sources] {
if (weak_this) {
base::StringView producer_name(weak_this->name_);
weak_this->producer_->ClearIncrementalState(data_sources.data(),
data_sources.size());
}
});
}
void TracingServiceImpl::ProducerEndpointImpl::Sync(
std::function<void()> callback) {
task_runner_->PostTask(callback);
}
////////////////////////////////////////////////////////////////////////////////
// TracingServiceImpl::TracingSession implementation
////////////////////////////////////////////////////////////////////////////////
TracingServiceImpl::TracingSession::TracingSession(
TracingSessionID session_id,
ConsumerEndpointImpl* consumer,
const TraceConfig& new_config,
base::TaskRunner* task_runner)
: id(session_id),
consumer_maybe_null(consumer),
consumer_uid(consumer->uid_),
config(new_config),
snapshot_periodic_task(task_runner),
timed_stop_task(task_runner) {
// all_data_sources_flushed is special because we store up to 64 events of
// this type. Other events will go through the default case in
// SnapshotLifecycleEvent() where they will be given a max history of 1.
lifecycle_events.emplace_back(
protos::pbzero::TracingServiceEvent::kAllDataSourcesFlushedFieldNumber,
64 /* max_size */);
}
} // namespace perfetto