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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 "components/viz/client/frame_eviction_manager.h"
#include <vector>
#include "base/memory/memory_pressure_listener.h"
#include "base/memory/raw_ptr.h"
#include "base/ranges/algorithm.h"
#include "base/test/test_mock_time_task_runner.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace viz {
namespace {
class TestFrameEvictionManagerClient : public FrameEvictionManagerClient {
public:
TestFrameEvictionManagerClient() = default;
explicit TestFrameEvictionManagerClient(FrameEvictionManager* manager)
: manager_(manager) {}
TestFrameEvictionManagerClient(const TestFrameEvictionManagerClient&) =
delete;
TestFrameEvictionManagerClient& operator=(
const TestFrameEvictionManagerClient&) = delete;
~TestFrameEvictionManagerClient() override {
if (has_frame_)
manager_->RemoveFrame(this);
}
// FrameEvictionManagerClient:
void EvictCurrentFrame() override {
manager_->RemoveFrame(this);
has_frame_ = false;
}
bool has_frame() const { return has_frame_; }
private:
raw_ptr<FrameEvictionManager> manager_ = FrameEvictionManager::GetInstance();
bool has_frame_ = true;
};
} // namespace
class FrameEvictionManagerTest : public testing::Test {};
TEST_F(FrameEvictionManagerTest, ScopedPause) {
constexpr int kMaxSavedFrames = 1;
constexpr int kFrames = 2;
FrameEvictionManager* manager = FrameEvictionManager::GetInstance();
manager->set_max_number_of_saved_frames(kMaxSavedFrames);
std::vector<TestFrameEvictionManagerClient> frames(kFrames);
{
FrameEvictionManager::ScopedPause scoped_pause;
for (auto& frame : frames)
manager->AddFrame(&frame, /*locked=*/false);
// All frames stays because |scoped_pause| holds off frame eviction.
EXPECT_EQ(kFrames, base::ranges::count_if(
frames, &TestFrameEvictionManagerClient::has_frame));
}
// Frame eviction happens when |scoped_pause| goes out of scope.
EXPECT_EQ(kMaxSavedFrames,
base::ranges::count_if(frames,
&TestFrameEvictionManagerClient::has_frame));
}
TEST_F(FrameEvictionManagerTest, PeriodicCulling) {
// Cannot use a TaskEnvironment as there is already one which is not using
// MOCK_TIME.
auto task_runner = base::MakeRefCounted<base::TestMockTimeTaskRunner>();
FrameEvictionManager manager;
manager.set_max_number_of_saved_frames(5);
manager.SetOverridesForTesting(task_runner, task_runner->GetMockTickClock());
TestFrameEvictionManagerClient frame1{&manager}, frame2{&manager},
frame3{&manager};
manager.AddFrame(&frame1, false);
task_runner->FastForwardBy(FrameEvictionManager::kPeriodicCullingDelay / 10);
manager.AddFrame(&frame2, true);
manager.AddFrame(&frame3, false);
task_runner->FastForwardBy(FrameEvictionManager::kPeriodicCullingDelay);
EXPECT_FALSE(frame1.has_frame());
EXPECT_TRUE(frame2.has_frame());
EXPECT_TRUE(frame3.has_frame()); // Too early for this one.
task_runner->FastForwardBy(FrameEvictionManager::kPeriodicCullingDelay);
EXPECT_FALSE(frame3.has_frame());
task_runner->FastForwardBy(FrameEvictionManager::kPeriodicCullingDelay / 2);
manager.UnlockFrame(&frame2);
EXPECT_TRUE(frame2.has_frame());
// Pause prevents eviction, but not rescheduling the task. Not using
// ScopedPause because it impacts the singleton.
manager.Pause();
task_runner->FastForwardBy(FrameEvictionManager::kPeriodicCullingDelay / 2);
EXPECT_TRUE(frame2.has_frame());
manager.Unpause();
task_runner->FastForwardBy(FrameEvictionManager::kPeriodicCullingDelay);
EXPECT_FALSE(frame2.has_frame());
}
TEST_F(FrameEvictionManagerTest, MemoryPressure) {
FrameEvictionManager* manager = FrameEvictionManager::GetInstance();
manager->set_max_number_of_saved_frames(5);
TestFrameEvictionManagerClient frame1, frame2;
manager->AddFrame(&frame1, false);
manager->AddFrame(&frame2, false);
// Critical memory pressure culls all unlocked frames.
manager->OnMemoryPressure(
base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL);
EXPECT_FALSE(frame1.has_frame());
EXPECT_FALSE(frame2.has_frame());
}
} // namespace viz
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