| // Copyright 2016 The Cobalt Authors. All Rights Reserved. |
| // |
| // 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 "starboard/system.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/sysinfo.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| #include "starboard/common/log.h" |
| #include "starboard/common/string.h" |
| #include "starboard/file.h" |
| |
| // We find the current amount of used memory on Linux by opening |
| // '/proc/self/status' and scan the file for its "VmRSS" and "VmSwap" entries. |
| // Essentially, we need to parse a buffer that has the following format: |
| // |
| // xxxxxx: 45327 kB |
| // yyyyyy: 23 kB |
| // VmRSS: 87432 kB |
| // zzzzzz: 3213 kB |
| // VmSwap: 15 kB |
| // ... |
| // |
| // And here, we would want to return the value 87432 * 1024 + 15 * 1024 (i.e. |
| // (VmRSS + VmSwap) * 1024). |
| // See http://man7.org/linux/man-pages/man5/proc.5.html for more details. |
| |
| // Searches for a specific value we're interested in and return it. Will |
| // modify |buffer| in order to do so quickly and easily. Returns the memory |
| // value in bytes (not kilobytes as it is presented in /proc/self/status). |
| int64_t SearchForMemoryValue( |
| const char* search_key, const char* buffer) { |
| const char* found = SbStringFindString(buffer, search_key); |
| if (!found) { |
| SB_LOG(ERROR) << "Could not find '" << search_key << "' in " |
| << "/proc/self/status."; |
| return 0; |
| } |
| |
| while (*found != '\0' && (*found < '0' || *found > '9')) { |
| ++found; |
| } |
| |
| if (*found == '\0') { |
| SB_LOG(ERROR) << "Unexpected end of string when searching for '" |
| << search_key << "' in /proc/self/status."; |
| return 0; |
| } |
| |
| // Convert the number string into an integer. |
| int64_t memory_value_in_kilobytes = 0; |
| while (*found >= '0' && *found <= '9') { |
| memory_value_in_kilobytes = memory_value_in_kilobytes * 10 + (*found - '0'); |
| ++found; |
| } |
| |
| return memory_value_in_kilobytes * 1024; |
| } |
| |
| int64_t SbSystemGetUsedCPUMemory() { |
| // Read our process' current physical memory usage from /proc/self/status. |
| starboard::ScopedFile status_file("/proc/self/status", |
| kSbFileOpenOnly | kSbFileRead); |
| if (!status_file.IsValid()) { |
| SB_LOG(ERROR) |
| << "Error opening /proc/self/status in order to query self memory " |
| "usage."; |
| return 0; |
| } |
| |
| // Read the entire file into memory. |
| const int kBufferSize = 2048; |
| char buffer[kBufferSize]; |
| int bytes_read = status_file.ReadAll(buffer, kBufferSize); |
| |
| // Ensure that this is a null-terminated string. |
| if (bytes_read == kBufferSize) { |
| bytes_read = kBufferSize - 1; |
| } |
| buffer[bytes_read] = '\0'; |
| |
| // Return the result, multiplied by 1024 because it is given in kilobytes. |
| return SearchForMemoryValue("VmRSS", buffer) + |
| SearchForMemoryValue("VmSwap", buffer); |
| } |