Update from https://crrev.com/320343

base/memory/discardable_memory_ashmem_allocator_unittest.cc

Index: base/memory/discardable_memory_ashmem_allocator_unittest.cc
diff --git a/base/memory/discardable_memory_ashmem_allocator_unittest.cc b/base/memory/discardable_memory_ashmem_allocator_unittest.cc
deleted file mode 100644
index e9f63ba343963d5ecb0b479668db073568c44ac4..0000000000000000000000000000000000000000
--- a/base/memory/discardable_memory_ashmem_allocator_unittest.cc
+++ /dev/null
@@ -1,319 +0,0 @@
-// Copyright 2014 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 "base/memory/discardable_memory_ashmem_allocator.h"
-
-#include <sys/types.h>
-#include <unistd.h>
-
-#include "base/memory/discardable_memory.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_split.h"
-#include "base/strings/stringprintf.h"
-#include "build/build_config.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace base {
-namespace internal {
-
-const char kAllocatorName[] = "allocator-for-testing";
-
-const size_t kAshmemRegionSizeForTesting = 32 * 1024 * 1024;
-const size_t kPageSize = 4096;
-
-const size_t kMaxAllowedAllocationSize =
-    std::numeric_limits<size_t>::max() - kPageSize + 1;
-
-class DiscardableMemoryAshmemAllocatorTest : public testing::Test {
- protected:
-  DiscardableMemoryAshmemAllocatorTest()
-      : allocator_(kAllocatorName, kAshmemRegionSizeForTesting) {
-  }
-
-  DiscardableMemoryAshmemAllocator allocator_;
-};
-
-void WriteToDiscardableAshmemChunk(DiscardableAshmemChunk* memory,
-                                   size_t size) {
-  // Write to the first and the last pages only to avoid paging in up to 64
-  // MBytes.
-  static_cast<char*>(memory->Memory())[0] = 'a';
-  static_cast<char*>(memory->Memory())[size - 1] = 'a';
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, Basic) {
-  const size_t size = 128;
-  scoped_ptr<DiscardableAshmemChunk> memory(allocator_.Allocate(size));
-  ASSERT_TRUE(memory);
-  WriteToDiscardableAshmemChunk(memory.get(), size);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, ZeroAllocationIsNotSupported) {
-  scoped_ptr<DiscardableAshmemChunk> memory(allocator_.Allocate(0));
-  ASSERT_FALSE(memory);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, TooLargeAllocationFails) {
-  scoped_ptr<DiscardableAshmemChunk> memory(
-      allocator_.Allocate(kMaxAllowedAllocationSize + 1));
-  // Page-alignment would have caused an overflow resulting in a small
-  // allocation if the input size wasn't checked correctly.
-  ASSERT_FALSE(memory);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest,
-       AshmemRegionsAreNotSmallerThanRequestedSize) {
-  // The creation of the underlying ashmem region is expected to fail since
-  // there should not be enough room in the address space. When ashmem creation
-  // fails, the allocator repetitively retries by dividing the size by 2. This
-  // size should not be smaller than the size the user requested so the
-  // allocation here should just fail (and not succeed with the minimum ashmem
-  // region size).
-  scoped_ptr<DiscardableAshmemChunk> memory(
-      allocator_.Allocate(kMaxAllowedAllocationSize));
-  ASSERT_FALSE(memory);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest,
-       AshmemRegionsAreAlwaysPageAligned) {
-  // Use a separate allocator here so that we can override the ashmem region
-  // size.
-  DiscardableMemoryAshmemAllocator allocator(
-      kAllocatorName, kMaxAllowedAllocationSize);
-  scoped_ptr<DiscardableAshmemChunk> memory(allocator.Allocate(kPageSize));
-  ASSERT_TRUE(memory);
-  EXPECT_GT(kMaxAllowedAllocationSize, allocator.last_ashmem_region_size());
-  ASSERT_TRUE(allocator.last_ashmem_region_size() % kPageSize == 0);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, LargeAllocation) {
-  const size_t size = 64 * 1024 * 1024;
-  scoped_ptr<DiscardableAshmemChunk> memory(allocator_.Allocate(size));
-  ASSERT_TRUE(memory);
-  WriteToDiscardableAshmemChunk(memory.get(), size);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, ChunksArePageAligned) {
-  scoped_ptr<DiscardableAshmemChunk> memory(allocator_.Allocate(kPageSize));
-  ASSERT_TRUE(memory);
-  EXPECT_EQ(0U, reinterpret_cast<uint64_t>(memory->Memory()) % kPageSize);
-  WriteToDiscardableAshmemChunk(memory.get(), kPageSize);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, AllocateFreeAllocate) {
-  scoped_ptr<DiscardableAshmemChunk> memory(allocator_.Allocate(kPageSize));
-  // Extra allocation that prevents the region from being deleted when |memory|
-  // gets deleted.
-  scoped_ptr<DiscardableAshmemChunk> memory_lock(
-      allocator_.Allocate(kPageSize));
-  ASSERT_TRUE(memory);
-  void* const address = memory->Memory();
-  memory->Unlock();  // Tests that the reused chunk is being locked correctly.
-  memory.reset();
-  memory = allocator_.Allocate(kPageSize);
-  ASSERT_TRUE(memory);
-  // The previously freed chunk should be reused.
-  EXPECT_EQ(address, memory->Memory());
-  WriteToDiscardableAshmemChunk(memory.get(), kPageSize);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest,
-       FreeingWholeAshmemRegionClosesAshmem) {
-  scoped_ptr<DiscardableAshmemChunk> memory(allocator_.Allocate(kPageSize));
-  ASSERT_TRUE(memory);
-  const int kMagic = 0xdeadbeef;
-  *static_cast<int*>(memory->Memory()) = kMagic;
-  memory.reset();
-  // The previous ashmem region should have been closed thus it should not be
-  // reused.
-  memory = allocator_.Allocate(kPageSize);
-  ASSERT_TRUE(memory);
-  EXPECT_NE(kMagic, *static_cast<const int*>(memory->Memory()));
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, AllocateUsesBestFitAlgorithm) {
-  scoped_ptr<DiscardableAshmemChunk> memory1(
-      allocator_.Allocate(3 * kPageSize));
-  ASSERT_TRUE(memory1);
-  scoped_ptr<DiscardableAshmemChunk> memory2(
-      allocator_.Allocate(2 * kPageSize));
-  ASSERT_TRUE(memory2);
-  scoped_ptr<DiscardableAshmemChunk> memory3(
-      allocator_.Allocate(1 * kPageSize));
-  ASSERT_TRUE(memory3);
-  void* const address_3 = memory3->Memory();
-  memory1.reset();
-  // Don't free |memory2| to avoid merging the 3 blocks together.
-  memory3.reset();
-  memory1 = allocator_.Allocate(1 * kPageSize);
-  ASSERT_TRUE(memory1);
-  // The chunk whose size is closest to the requested size should be reused.
-  EXPECT_EQ(address_3, memory1->Memory());
-  WriteToDiscardableAshmemChunk(memory1.get(), kPageSize);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, MergeFreeChunks) {
-  scoped_ptr<DiscardableAshmemChunk> memory1(allocator_.Allocate(kPageSize));
-  ASSERT_TRUE(memory1);
-  scoped_ptr<DiscardableAshmemChunk> memory2(allocator_.Allocate(kPageSize));
-  ASSERT_TRUE(memory2);
-  scoped_ptr<DiscardableAshmemChunk> memory3(allocator_.Allocate(kPageSize));
-  ASSERT_TRUE(memory3);
-  scoped_ptr<DiscardableAshmemChunk> memory4(allocator_.Allocate(kPageSize));
-  ASSERT_TRUE(memory4);
-  void* const memory1_address = memory1->Memory();
-  memory1.reset();
-  memory3.reset();
-  // Freeing |memory2| (located between memory1 and memory3) should merge the
-  // three free blocks together.
-  memory2.reset();
-  memory1 = allocator_.Allocate(3 * kPageSize);
-  EXPECT_EQ(memory1_address, memory1->Memory());
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, MergeFreeChunksAdvanced) {
-  scoped_ptr<DiscardableAshmemChunk> memory1(
-      allocator_.Allocate(4 * kPageSize));
-  ASSERT_TRUE(memory1);
-  scoped_ptr<DiscardableAshmemChunk> memory2(
-      allocator_.Allocate(4 * kPageSize));
-  ASSERT_TRUE(memory2);
-  void* const memory1_address = memory1->Memory();
-  memory1.reset();
-  memory1 = allocator_.Allocate(2 * kPageSize);
-  memory2.reset();
-  // At this point, the region should be in this state:
-  // 8 KBytes (used), 24 KBytes (free).
-  memory2 = allocator_.Allocate(6 * kPageSize);
-  EXPECT_EQ(
-      static_cast<const char*>(memory2->Memory()),
-      static_cast<const char*>(memory1_address) + 2 * kPageSize);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, MergeFreeChunksAdvanced2) {
-  scoped_ptr<DiscardableAshmemChunk> memory1(
-      allocator_.Allocate(4 * kPageSize));
-  ASSERT_TRUE(memory1);
-  scoped_ptr<DiscardableAshmemChunk> memory2(
-      allocator_.Allocate(4 * kPageSize));
-  ASSERT_TRUE(memory2);
-  void* const memory1_address = memory1->Memory();
-  memory1.reset();
-  memory1 = allocator_.Allocate(2 * kPageSize);
-  scoped_ptr<DiscardableAshmemChunk> memory3(
-      allocator_.Allocate(2 * kPageSize));
-  // At this point, the region should be in this state:
-  // 8 KBytes (used), 8 KBytes (used), 16 KBytes (used).
-  memory3.reset();
-  memory2.reset();
-  // At this point, the region should be in this state:
-  // 8 KBytes (used), 24 KBytes (free).
-  memory2 = allocator_.Allocate(6 * kPageSize);
-  EXPECT_EQ(
-      static_cast<const char*>(memory2->Memory()),
-      static_cast<const char*>(memory1_address) + 2 * kPageSize);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest,
-       MergeFreeChunksAndDeleteAshmemRegion) {
-  scoped_ptr<DiscardableAshmemChunk> memory1(
-      allocator_.Allocate(4 * kPageSize));
-  ASSERT_TRUE(memory1);
-  scoped_ptr<DiscardableAshmemChunk> memory2(
-      allocator_.Allocate(4 * kPageSize));
-  ASSERT_TRUE(memory2);
-  memory1.reset();
-  memory1 = allocator_.Allocate(2 * kPageSize);
-  scoped_ptr<DiscardableAshmemChunk> memory3(
-      allocator_.Allocate(2 * kPageSize));
-  // At this point, the region should be in this state:
-  // 8 KBytes (used), 8 KBytes (used), 16 KBytes (used).
-  memory1.reset();
-  memory3.reset();
-  // At this point, the region should be in this state:
-  // 8 KBytes (free), 8 KBytes (used), 8 KBytes (free).
-  const int kMagic = 0xdeadbeef;
-  *static_cast<int*>(memory2->Memory()) = kMagic;
-  memory2.reset();
-  // The whole region should have been deleted.
-  memory2 = allocator_.Allocate(2 * kPageSize);
-  EXPECT_NE(kMagic, *static_cast<int*>(memory2->Memory()));
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest,
-     TooLargeFreeChunksDontCauseTooMuchFragmentationWhenRecycled) {
-  // Keep |memory_1| below allocated so that the ashmem region doesn't get
-  // closed when |memory_2| is deleted.
-  scoped_ptr<DiscardableAshmemChunk> memory_1(allocator_.Allocate(64 * 1024));
-  ASSERT_TRUE(memory_1);
-  scoped_ptr<DiscardableAshmemChunk> memory_2(allocator_.Allocate(32 * 1024));
-  ASSERT_TRUE(memory_2);
-  void* const address = memory_2->Memory();
-  memory_2.reset();
-  const size_t size = 16 * 1024;
-  memory_2 = allocator_.Allocate(size);
-  ASSERT_TRUE(memory_2);
-  EXPECT_EQ(address, memory_2->Memory());
-  WriteToDiscardableAshmemChunk(memory_2.get(), size);
-  scoped_ptr<DiscardableAshmemChunk> memory_3(allocator_.Allocate(size));
-  // The unused tail (16 KBytes large) of the previously freed chunk should be
-  // reused.
-  EXPECT_EQ(static_cast<char*>(address) + size, memory_3->Memory());
-  WriteToDiscardableAshmemChunk(memory_3.get(), size);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest, UseMultipleAshmemRegions) {
-  // Leave one page untouched at the end of the ashmem region.
-  const size_t size = kAshmemRegionSizeForTesting - kPageSize;
-  scoped_ptr<DiscardableAshmemChunk> memory1(allocator_.Allocate(size));
-  ASSERT_TRUE(memory1);
-  WriteToDiscardableAshmemChunk(memory1.get(), size);
-
-  scoped_ptr<DiscardableAshmemChunk> memory2(
-      allocator_.Allocate(kAshmemRegionSizeForTesting));
-  ASSERT_TRUE(memory2);
-  WriteToDiscardableAshmemChunk(memory2.get(), kAshmemRegionSizeForTesting);
-  // The last page of the first ashmem region should be used for this
-  // allocation.
-  scoped_ptr<DiscardableAshmemChunk> memory3(allocator_.Allocate(kPageSize));
-  ASSERT_TRUE(memory3);
-  WriteToDiscardableAshmemChunk(memory3.get(), kPageSize);
-  EXPECT_EQ(memory3->Memory(), static_cast<char*>(memory1->Memory()) + size);
-}
-
-TEST_F(DiscardableMemoryAshmemAllocatorTest,
-       HighestAllocatedChunkPointerIsUpdatedWhenHighestChunkGetsSplit) {
-  // Prevents the ashmem region from getting closed when |memory2| gets freed.
-  scoped_ptr<DiscardableAshmemChunk> memory1(allocator_.Allocate(kPageSize));
-  ASSERT_TRUE(memory1);
-
-  scoped_ptr<DiscardableAshmemChunk> memory2(
-      allocator_.Allocate(4 * kPageSize));
-  ASSERT_TRUE(memory2);
-
-  memory2.reset();
-  memory2 = allocator_.Allocate(kPageSize);
-  // There should now be a free chunk of size 3 * |kPageSize| starting at offset
-  // 2 * |kPageSize| and the pointer to the highest allocated chunk should have
-  // also been updated to |base_| + 2 * |kPageSize|. This pointer is used to
-  // maintain the container mapping a chunk address to its previous chunk and
-  // this map is in turn used while merging previous contiguous chunks.
-
-  // Allocate more than 3 * |kPageSize| so that the free chunk of size 3 *
-  // |kPageSize| is not reused and |highest_allocated_chunk_| gets used instead.
-  scoped_ptr<DiscardableAshmemChunk> memory3(
-      allocator_.Allocate(4 * kPageSize));
-  ASSERT_TRUE(memory3);
-
-  // Deleting |memory3| (whose size is 4 * |kPageSize|) should result in a merge
-  // with its previous chunk which is the free chunk of size |3 * kPageSize|.
-  memory3.reset();
-  memory3 = allocator_.Allocate((3 + 4) * kPageSize);
-  EXPECT_EQ(memory3->Memory(),
-            static_cast<const char*>(memory2->Memory()) + kPageSize);
-}
-
-}  // namespace internal
-}  // namespace base