blob: bee7407e9b203b407bbfaf8a759569afb9155ac3 [file] [log] [blame]
// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <jni.h>
#include "base/android/library_loader/anchor_functions_buildflags.h"
#include "base/base_export.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "starboard/types.h"
namespace base {
namespace android {
// Forks and waits for a process prefetching the native library. This is done in
// a forked process for the following reasons:
// - Isolating the main process from mistakes in getting the address range, only
// crashing the forked process in case of mistake.
// - Not inflating the memory used by the main process uselessly, which could
// increase its likelihood to be killed.
// The forked process has background priority and, since it is not declared to
// the Android runtime, can be killed at any time, which is not an issue here.
class BASE_EXPORT NativeLibraryPrefetcher {
// Finds the executable code range, forks a low priority process pre-fetching
// it wait()s for the process to exit or die. If ordered_only is true, only
// the ordered section is prefetched. See GetOrdrderedTextRange() in
static void ForkAndPrefetchNativeLibrary(bool ordered_only);
// Returns the percentage of the native library code currently resident in
// memory, or -1 in case of error.
static int PercentageOfResidentNativeLibraryCode();
// Collects residency for the native library executable multiple times, then
// dumps it to disk.
static void PeriodicallyCollectResidency();
// Calls madvise() on the native library executable, using orderfile
// information to decide how to advise each part of the library.
static void MadviseForOrderfile();
// Returns the percentage of [start, end] currently resident in
// memory, or -1 in case of error.
static int PercentageOfResidentCode(size_t start, size_t end);
} // namespace android
} // namespace base