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90 lines
3.7 KiB
C
90 lines
3.7 KiB
C
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// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_ANDROID_LIBRARY_LOADER_LIBRARY_PREFETCHER_H_
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#define BASE_ANDROID_LIBRARY_LOADER_LIBRARY_PREFETCHER_H_
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#include <jni.h>
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#include <stdint.h>
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#include <string>
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#include <utility>
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#include <vector>
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#include "base/debug/proc_maps_linux.h"
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#include "base/gtest_prod_util.h"
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#include "base/macros.h"
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namespace base {
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namespace android {
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// Forks and waits for a process prefetching the native library. This is done in
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// a forked process for the following reasons:
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// - Isolating the main process from mistakes in the parsing. If the parsing
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// returns an incorrect address, only the forked process will crash.
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// - Not inflating the memory used by the main process uselessly, which could
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// increase its likelihood to be killed.
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// The forked process has background priority and, since it is not declared to
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// the Android runtime, can be killed at any time, which is not an issue here.
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class BASE_EXPORT NativeLibraryPrefetcher {
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public:
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using AddressRange = std::pair<uintptr_t, uintptr_t>;
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// Finds the ranges matching the native library, forks a low priority
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// process pre-fetching these ranges and wait()s for it.
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// Returns true for success.
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static bool ForkAndPrefetchNativeLibrary();
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// Returns the percentage of the native library code currently resident in
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// memory, or -1 in case of error.
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static int PercentageOfResidentNativeLibraryCode();
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// Collects residency for the native library executable multiple times, then
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// dumps it to disk.
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static void PeriodicallyCollectResidency();
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// Calls madvise(MADV_RANDOM) on the native library executable code range.
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static void MadviseRandomText();
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private:
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// Returns true if the region matches native code or data.
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static bool IsGoodToPrefetch(const base::debug::MappedMemoryRegion& region);
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// Filters the regions to keep only libchrome ranges if possible.
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static void FilterLibchromeRangesOnlyIfPossible(
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const std::vector<base::debug::MappedMemoryRegion>& regions,
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std::vector<AddressRange>* ranges);
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// Finds the ranges matching the native library in /proc/self/maps.
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// Returns true for success.
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static bool FindRanges(std::vector<AddressRange>* ranges);
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// Returns the percentage of the given address ranges currently resident in
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// memory, or -1 in case of error.
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static int PercentageOfResidentCode(const std::vector<AddressRange>& ranges);
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FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
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TestIsGoodToPrefetchNoRange);
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FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
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TestIsGoodToPrefetchUnreadableRange);
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FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
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TestIsGoodToPrefetchSkipSharedRange);
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FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
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TestIsGoodToPrefetchLibchromeRange);
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FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
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TestIsGoodToPrefetchBaseApkRange);
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FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
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TestFilterLibchromeRangesOnlyIfPossibleNoLibchrome);
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FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
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TestFilterLibchromeRangesOnlyIfPossibleHasLibchrome);
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FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
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TestPercentageOfResidentCode);
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FRIEND_TEST_ALL_PREFIXES(NativeLibraryPrefetcherTest,
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TestPercentageOfResidentCodeTwoRegions);
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DISALLOW_IMPLICIT_CONSTRUCTORS(NativeLibraryPrefetcher);
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};
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} // namespace android
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} // namespace base
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#endif // BASE_ANDROID_LIBRARY_LOADER_LIBRARY_PREFETCHER_H_
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