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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/wtf/allocator/partitions.h"
#include <vector>
#include "build/build_config.h"
#include "partition_alloc/memory_reclaimer.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace WTF {
// Otherwise, PartitionAlloc doesn't allocate any memory, and the tests are
// meaningless.
#if !defined(MEMORY_TOOL_REPLACES_ALLOCATOR)
class PartitionsTest : public ::testing::Test {
protected:
void TearDown() override {
::partition_alloc::MemoryReclaimer::Instance()->ReclaimAll();
}
};
TEST_F(PartitionsTest, MemoryIsInitiallyCommitted) {
// std::vector to explicitly not use PartitionAlloc.
std::vector<void*> allocated_pointers;
size_t committed_before = Partitions::TotalSizeOfCommittedPages();
// Need to allocate enough memory to require a new super page. Unless nothing
// else in the process has allocated anything, this can be after several
// iterations.
while (Partitions::TotalSizeOfCommittedPages() == committed_before) {
void* data = Partitions::BufferMalloc(100, "");
ASSERT_TRUE(data);
allocated_pointers.push_back(data);
}
size_t committed_after = Partitions::TotalSizeOfCommittedPages();
// No buffer data committed initially, hence committed size increases.
EXPECT_GT(committed_after, committed_before);
// Increase is larger than the allocation.
EXPECT_GT(committed_after, committed_before + allocated_pointers.size());
for (void* data : allocated_pointers)
Partitions::BufferFree(data);
// Decommit is not triggered by deallocation.
size_t committed_after_free = Partitions::TotalSizeOfCommittedPages();
// >0 rather than equal to |committed_after|, since total waste in empty slot
// spans is capped.
EXPECT_GT(committed_after_free, 0u);
}
TEST_F(PartitionsTest, Decommit) {
std::vector<void*> allocated_pointers;
size_t committed_before = Partitions::TotalSizeOfCommittedPages();
while (Partitions::TotalSizeOfCommittedPages() == committed_before) {
void* data = Partitions::BufferMalloc(100, "");
ASSERT_TRUE(data);
allocated_pointers.push_back(data);
}
size_t committed_after = Partitions::TotalSizeOfCommittedPages();
for (void* data : allocated_pointers)
Partitions::BufferFree(data);
// Decommit is not triggered by deallocation.
EXPECT_GT(committed_after, committed_before);
// Decommit works.
::partition_alloc::MemoryReclaimer::Instance()->ReclaimAll();
EXPECT_LT(Partitions::TotalSizeOfCommittedPages(), committed_after);
}
#endif // !defined(MEMORY_TOOL_REPLACES_ALLOCATOR)
} // namespace WTF
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