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// 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 "content/common/host_discardable_shared_memory_manager.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
namespace {
class TestDiscardableSharedMemory : public base::DiscardableSharedMemory {
public:
TestDiscardableSharedMemory() {}
explicit TestDiscardableSharedMemory(base::SharedMemoryHandle handle)
: DiscardableSharedMemory(handle) {}
void SetNow(base::Time now) { now_ = now; }
private:
// Overriden from base::DiscardableSharedMemory:
base::Time Now() const override { return now_; }
base::Time now_;
};
class TestHostDiscardableSharedMemoryManager
: public HostDiscardableSharedMemoryManager {
public:
TestHostDiscardableSharedMemoryManager()
: enforce_memory_policy_pending_(false) {}
void SetNow(base::Time now) { now_ = now; }
void set_enforce_memory_policy_pending(bool enforce_memory_policy_pending) {
enforce_memory_policy_pending_ = enforce_memory_policy_pending;
}
bool enforce_memory_policy_pending() const {
return enforce_memory_policy_pending_;
}
private:
// Overriden from HostDiscardableSharedMemoryManager:
base::Time Now() const override { return now_; }
void ScheduleEnforceMemoryPolicy() override {
enforce_memory_policy_pending_ = true;
}
base::Time now_;
bool enforce_memory_policy_pending_;
};
class HostDiscardableSharedMemoryManagerTest : public testing::Test {
protected:
// Overridden from testing::Test:
void SetUp() override {
manager_.reset(new TestHostDiscardableSharedMemoryManager);
}
scoped_ptr<TestHostDiscardableSharedMemoryManager> manager_;
};
TEST_F(HostDiscardableSharedMemoryManagerTest, AllocateForChild) {
const int kDataSize = 1024;
uint8 data[kDataSize];
memset(data, 0x80, kDataSize);
base::SharedMemoryHandle shared_handle;
manager_->AllocateLockedDiscardableSharedMemoryForChild(
base::GetCurrentProcessHandle(), kDataSize, 0, &shared_handle);
ASSERT_TRUE(base::SharedMemory::IsHandleValid(shared_handle));
TestDiscardableSharedMemory memory(shared_handle);
bool rv = memory.Map(kDataSize);
ASSERT_TRUE(rv);
memcpy(memory.memory(), data, kDataSize);
memory.SetNow(base::Time::FromDoubleT(1));
memory.Unlock(0, 0);
ASSERT_EQ(base::DiscardableSharedMemory::SUCCESS, memory.Lock(0, 0));
EXPECT_EQ(memcmp(data, memory.memory(), kDataSize), 0);
memory.Unlock(0, 0);
}
TEST_F(HostDiscardableSharedMemoryManagerTest, Purge) {
const int kDataSize = 1024;
base::SharedMemoryHandle shared_handle1;
manager_->AllocateLockedDiscardableSharedMemoryForChild(
base::GetCurrentProcessHandle(), kDataSize, 1, &shared_handle1);
ASSERT_TRUE(base::SharedMemory::IsHandleValid(shared_handle1));
TestDiscardableSharedMemory memory1(shared_handle1);
bool rv = memory1.Map(kDataSize);
ASSERT_TRUE(rv);
base::SharedMemoryHandle shared_handle2;
manager_->AllocateLockedDiscardableSharedMemoryForChild(
base::GetCurrentProcessHandle(), kDataSize, 2, &shared_handle2);
ASSERT_TRUE(base::SharedMemory::IsHandleValid(shared_handle2));
TestDiscardableSharedMemory memory2(shared_handle2);
rv = memory2.Map(kDataSize);
ASSERT_TRUE(rv);
// Enough memory for both allocations.
manager_->SetNow(base::Time::FromDoubleT(1));
manager_->SetMemoryLimit(memory1.mapped_size() + memory2.mapped_size());
memory1.SetNow(base::Time::FromDoubleT(2));
memory1.Unlock(0, 0);
memory2.SetNow(base::Time::FromDoubleT(2));
memory2.Unlock(0, 0);
// Manager should not have to schedule another call to EnforceMemoryPolicy().
manager_->SetNow(base::Time::FromDoubleT(3));
manager_->EnforceMemoryPolicy();
EXPECT_FALSE(manager_->enforce_memory_policy_pending());
// Memory should still be resident.
EXPECT_TRUE(memory1.IsMemoryResident());
EXPECT_TRUE(memory2.IsMemoryResident());
auto lock_rv = memory1.Lock(0, 0);
EXPECT_EQ(base::DiscardableSharedMemory::SUCCESS, lock_rv);
lock_rv = memory2.Lock(0, 0);
EXPECT_EQ(base::DiscardableSharedMemory::SUCCESS, lock_rv);
memory1.SetNow(base::Time::FromDoubleT(4));
memory1.Unlock(0, 0);
memory2.SetNow(base::Time::FromDoubleT(5));
memory2.Unlock(0, 0);
// Just enough memory for one allocation.
manager_->SetNow(base::Time::FromDoubleT(6));
manager_->SetMemoryLimit(memory2.mapped_size());
EXPECT_FALSE(manager_->enforce_memory_policy_pending());
// LRU allocation should still be resident.
EXPECT_FALSE(memory1.IsMemoryResident());
EXPECT_TRUE(memory2.IsMemoryResident());
lock_rv = memory1.Lock(0, 0);
EXPECT_EQ(base::DiscardableSharedMemory::FAILED, lock_rv);
lock_rv = memory2.Lock(0, 0);
EXPECT_EQ(base::DiscardableSharedMemory::SUCCESS, lock_rv);
}
TEST_F(HostDiscardableSharedMemoryManagerTest, EnforceMemoryPolicy) {
const int kDataSize = 1024;
base::SharedMemoryHandle shared_handle;
manager_->AllocateLockedDiscardableSharedMemoryForChild(
base::GetCurrentProcessHandle(), kDataSize, 0, &shared_handle);
ASSERT_TRUE(base::SharedMemory::IsHandleValid(shared_handle));
TestDiscardableSharedMemory memory(shared_handle);
bool rv = memory.Map(kDataSize);
ASSERT_TRUE(rv);
// Not enough memory for one allocation.
manager_->SetNow(base::Time::FromDoubleT(1));
manager_->SetMemoryLimit(memory.mapped_size() - 1);
// We need to enforce memory policy as our memory usage is currently above
// the limit.
EXPECT_TRUE(manager_->enforce_memory_policy_pending());
manager_->set_enforce_memory_policy_pending(false);
manager_->SetNow(base::Time::FromDoubleT(2));
manager_->EnforceMemoryPolicy();
// Still need to enforce memory policy as nothing can be purged.
EXPECT_TRUE(manager_->enforce_memory_policy_pending());
memory.SetNow(base::Time::FromDoubleT(3));
memory.Unlock(0, 0);
manager_->set_enforce_memory_policy_pending(false);
manager_->SetNow(base::Time::FromDoubleT(4));
manager_->EnforceMemoryPolicy();
// Memory policy should have successfully been enforced.
EXPECT_FALSE(manager_->enforce_memory_policy_pending());
EXPECT_EQ(base::DiscardableSharedMemory::FAILED, memory.Lock(0, 0));
}
} // namespace
} // namespace content
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