// 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 "chromeos/ash/components/memory/pressure/system_memory_pressure_evaluator.h"
#include <unistd.h>
#include <string>
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/functional/bind.h"
#include "base/run_loop.h"
#include "base/synchronization/waitable_event.h"
#include "base/system/sys_info.h"
#include "base/test/task_environment.h"
#include "base/test/test_timeouts.h"
#include "base/threading/platform_thread.h"
#include "base/threading/scoped_blocking_call.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace ash {
namespace memory {
namespace {
using PressureLevel = ResourcedClient::PressureLevel;
// Processes PressureCallback calls by just storing the sequence of events so we
// can validate that we received the expected pressure levels as the test runs.
void PressureCallback(
std::vector<base::MemoryPressureListener::MemoryPressureLevel>* history,
base::MemoryPressureListener::MemoryPressureLevel level) {
history->push_back(level);
}
} // namespace
class TestSystemMemoryPressureEvaluator : public SystemMemoryPressureEvaluator {
public:
TestSystemMemoryPressureEvaluator(
bool for_testing,
std::unique_ptr<memory_pressure::MemoryPressureVoter> voter)
: SystemMemoryPressureEvaluator(for_testing, std::move(voter)) {}
void OnMemoryPressure(
PressureLevel level,
memory_pressure::ReclaimTarget reclaim_target) override {
SystemMemoryPressureEvaluator::OnMemoryPressure(level, reclaim_target);
}
TestSystemMemoryPressureEvaluator(const TestSystemMemoryPressureEvaluator&) =
delete;
TestSystemMemoryPressureEvaluator& operator=(
const TestSystemMemoryPressureEvaluator&) = delete;
~TestSystemMemoryPressureEvaluator() override = default;
};
TEST(ChromeOSSystemMemoryPressureEvaluatorTest, CheckMemoryPressure) {
base::test::TaskEnvironment task_environment(
base::test::TaskEnvironment::MainThreadType::UI);
// We will use a mock listener to keep track of our kernel notifications which
// cause event to be fired. We can just examine the sequence of pressure
// events when we're done to validate that the pressure events were as
// expected.
std::vector<base::MemoryPressureListener::MemoryPressureLevel>
pressure_events;
auto listener = std::make_unique<base::MemoryPressureListener>(
FROM_HERE, base::BindRepeating(&PressureCallback, &pressure_events));
memory_pressure::MultiSourceMemoryPressureMonitor monitor;
auto evaluator = std::make_unique<TestSystemMemoryPressureEvaluator>(
/*for_testing=*/true, monitor.CreateVoter());
// At this point we have no memory pressure.
ASSERT_EQ(base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE,
evaluator->current_vote());
// Moderate Pressure.
evaluator->OnMemoryPressure(PressureLevel::MODERATE,
memory_pressure::ReclaimTarget(1000));
base::RunLoop().RunUntilIdle();
ASSERT_EQ(base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
evaluator->current_vote());
// Critical Pressure.
evaluator->OnMemoryPressure(PressureLevel::CRITICAL,
memory_pressure::ReclaimTarget(1000));
base::RunLoop().RunUntilIdle();
ASSERT_EQ(base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL,
evaluator->current_vote());
// Moderate Pressure.
evaluator->OnMemoryPressure(PressureLevel::MODERATE,
memory_pressure::ReclaimTarget(1000));
base::RunLoop().RunUntilIdle();
ASSERT_EQ(base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
evaluator->current_vote());
// No pressure, note: this will not cause any event.
evaluator->OnMemoryPressure(PressureLevel::NONE,
memory_pressure::ReclaimTarget(0));
base::RunLoop().RunUntilIdle();
ASSERT_EQ(base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE,
evaluator->current_vote());
// Back into moderate.
evaluator->OnMemoryPressure(PressureLevel::MODERATE,
memory_pressure::ReclaimTarget(1000));
base::RunLoop().RunUntilIdle();
ASSERT_EQ(base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
evaluator->current_vote());
// Now our events should be MODERATE, CRITICAL, MODERATE.
ASSERT_EQ(4u, pressure_events.size());
ASSERT_EQ(base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
pressure_events[0]);
ASSERT_EQ(base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL,
pressure_events[1]);
ASSERT_EQ(base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
pressure_events[2]);
ASSERT_EQ(base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
pressure_events[3]);
}
} // namespace memory
} // namespace ash