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base / android / library_loader / library_prefetcher_unittest.cc [blame]
// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/android/library_loader/library_prefetcher.h"
#include <stddef.h>
#include <stdint.h>
#include <sys/mman.h>
#include "base/android/library_loader/anchor_functions_buildflags.h"
#include "base/memory/writable_shared_memory_region.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
#if BUILDFLAG(SUPPORTS_CODE_ORDERING)
namespace base {
namespace android {
// Fails with ASAN, crbug.com/570423.
#if !defined(ADDRESS_SANITIZER)
namespace {
const size_t kPageSize = 4096;
} // namespace
// https://crbug.com/1056021 - flaky on Nexus 5.
TEST(NativeLibraryPrefetcherTest, DISABLED_TestPercentageOfResidentCode) {
size_t length = 4 * kPageSize;
auto shared_region = base::WritableSharedMemoryRegion::Create(length);
ASSERT_TRUE(shared_region.IsValid());
auto mapping = shared_region.Map();
ASSERT_TRUE(mapping.IsValid());
// SAFETY: There's no public way to get a span of the full mapped memory size.
// The `mapped_size()` is larger then `size()` but is the actual size of the
// shared memory backing.
span<uint8_t> memory =
UNSAFE_BUFFERS(base::span(mapping.data(), mapping.mapped_size()));
auto start = reinterpret_cast<uintptr_t>(&*memory.begin());
auto end = reinterpret_cast<uintptr_t>(&*memory.end());
// Remove everything.
ASSERT_EQ(0, madvise(memory.data(), memory.size(), MADV_DONTNEED));
EXPECT_EQ(0, NativeLibraryPrefetcher::PercentageOfResidentCode(start, end));
// Get everything back.
ASSERT_EQ(0, mlock(memory.data(), memory.size()));
EXPECT_EQ(100, NativeLibraryPrefetcher::PercentageOfResidentCode(start, end));
munlock(memory.data(), memory.size());
}
#endif // !defined(ADDRESS_SANITIZER)
} // namespace android
} // namespace base
#endif // BUILDFLAG(SUPPORTS_CODE_ORDERING)