mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 06:16:30 +03:00
67 lines
2.4 KiB
C++
67 lines
2.4 KiB
C++
// 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.
|
|
|
|
#ifndef BASE_ANDROID_LIBRARY_LOADER_LIBRARY_PREFETCHER_H_
|
|
#define BASE_ANDROID_LIBRARY_LOADER_LIBRARY_PREFETCHER_H_
|
|
|
|
#include <jni.h>
|
|
|
|
#include <stdint.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"
|
|
|
|
#if BUILDFLAG(SUPPORTS_CODE_ORDERING)
|
|
|
|
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 {
|
|
public:
|
|
// 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
|
|
// library_prefetcher.cc.
|
|
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();
|
|
|
|
private:
|
|
// 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);
|
|
|
|
FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
|
|
TestPercentageOfResidentCode);
|
|
|
|
DISALLOW_IMPLICIT_CONSTRUCTORS(NativeLibraryPrefetcher);
|
|
};
|
|
|
|
} // namespace android
|
|
} // namespace base
|
|
|
|
#endif // BUILDFLAG(SUPPORTS_CODE_ORDERING)
|
|
|
|
#endif // BASE_ANDROID_LIBRARY_LOADER_LIBRARY_PREFETCHER_H_
|