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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/common/android/cpu_time_metrics_internal.h"
#include "base/metrics/persistent_histogram_allocator.h"
#include "base/synchronization/waitable_event.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/test/task_environment.h"
#include "base/threading/thread.h"
#include "content/common/process_visibility_tracker.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace content {
namespace internal {
namespace {
void WorkForOneCpuSec(base::WaitableEvent* event) {
auto initial_ticks = base::ThreadTicks::Now();
while (!event->IsSignaled()) {
if (base::ThreadTicks::Now() > initial_ticks + base::Seconds(1)) {
event->Signal();
}
}
}
TEST(CpuTimeMetricsTest, RecordsMetricsForeground) {
// Ensure the visibility tracker is created on the test runner thread.
ProcessVisibilityTracker::GetInstance();
base::test::TaskEnvironment task_environment;
base::HistogramTester histograms;
base::Thread thread1("StackSamplingProfiler");
thread1.StartAndWaitForTesting();
ASSERT_TRUE(thread1.IsRunning());
base::WaitableEvent event;
// Create the ProcessCpuTimeMetrics instance and register it as the process
// visibility observer.
ProcessCpuTimeMetrics::SetIgnoreHistogramAllocatorForTesting(true);
std::unique_ptr<ProcessCpuTimeMetrics> metrics =
ProcessCpuTimeMetrics::CreateForTesting();
metrics->WaitForCollectionForTesting();
// Start out in the foreground and spend one CPU second there.
ProcessVisibilityTracker::GetInstance()->OnProcessVisibilityChanged(true);
metrics->WaitForCollectionForTesting();
thread1.task_runner()->PostTask(
FROM_HERE, BindOnce(&WorkForOneCpuSec, base::Unretained(&event)));
// Wait until the thread has consumed one second of CPU time.
event.Wait();
// Update the state to background to trigger the collection of high level
// metrics.
ProcessVisibilityTracker::GetInstance()->OnProcessVisibilityChanged(false);
metrics->WaitForCollectionForTesting();
// The test process has no process-type command line flag, so is recognized as
// the browser process. The thread created above is named like a sampling
// profiler thread.
static constexpr int kBrowserProcessBucket = 2;
static constexpr int kSamplingProfilerThreadBucket = 24;
// Expect that the CPU second spent by the thread above is represented in the
// metrics.
int browser_cpu_seconds = histograms.GetBucketCount(
"Power.CpuTimeSecondsPerProcessType", kBrowserProcessBucket);
EXPECT_GE(browser_cpu_seconds, 1);
int browser_cpu_seconds_foreground = histograms.GetBucketCount(
"Power.CpuTimeSecondsPerProcessType.Foreground", kBrowserProcessBucket);
EXPECT_GE(browser_cpu_seconds_foreground, 1);
// Thread breakdown requires periodic collection.
int thread_cpu_seconds =
histograms.GetBucketCount("Power.CpuTimeSecondsPerThreadType.Browser",
kSamplingProfilerThreadBucket);
EXPECT_EQ(thread_cpu_seconds, 0);
metrics->PerformFullCollectionForTesting();
metrics->WaitForCollectionForTesting();
thread_cpu_seconds =
histograms.GetBucketCount("Power.CpuTimeSecondsPerThreadType.Browser",
kSamplingProfilerThreadBucket);
EXPECT_GE(thread_cpu_seconds, 1);
thread1.Stop();
ProcessCpuTimeMetrics::SetIgnoreHistogramAllocatorForTesting(false);
}
TEST(CpuTimeMetricsTest, RecordsMetricsBackground) {
// Ensure the visibility tracker is created on the test runner thread.
ProcessVisibilityTracker::GetInstance();
base::test::TaskEnvironment task_environment;
base::HistogramTester histograms;
base::Thread thread1("StackSamplingProfiler");
thread1.StartAndWaitForTesting();
ASSERT_TRUE(thread1.IsRunning());
base::WaitableEvent event;
// Create the ProcessCpuTimeMetrics instance and register it as the process
// visibility observer.
ProcessCpuTimeMetrics::SetIgnoreHistogramAllocatorForTesting(true);
std::unique_ptr<ProcessCpuTimeMetrics> metrics =
ProcessCpuTimeMetrics::CreateForTesting();
metrics->WaitForCollectionForTesting();
// Start out in the background and spend one CPU second there.
ProcessVisibilityTracker::GetInstance()->OnProcessVisibilityChanged(false);
metrics->WaitForCollectionForTesting();
thread1.task_runner()->PostTask(
FROM_HERE, BindOnce(&WorkForOneCpuSec, base::Unretained(&event)));
// Wait until the thread has consumed one second of CPU time.
event.Wait();
// Update the state to foreground to trigger the collection of high level
// metrics.
ProcessVisibilityTracker::GetInstance()->OnProcessVisibilityChanged(true);
metrics->WaitForCollectionForTesting();
// The test process has no process-type command line flag, so is recognized as
// the browser process. The thread created above is named like a sampling
// profiler thread.
static constexpr int kBrowserProcessBucket = 2;
static constexpr int kSamplingProfilerThreadBucket = 24;
// Expect that the CPU second spent by the thread above is represented in the
// metrics.
int browser_cpu_seconds = histograms.GetBucketCount(
"Power.CpuTimeSecondsPerProcessType", kBrowserProcessBucket);
EXPECT_GE(browser_cpu_seconds, 1);
int browser_cpu_seconds_background = histograms.GetBucketCount(
"Power.CpuTimeSecondsPerProcessType.Background", kBrowserProcessBucket);
EXPECT_GE(browser_cpu_seconds_background, 1);
// Thread breakdown requires periodic collection.
int thread_cpu_seconds =
histograms.GetBucketCount("Power.CpuTimeSecondsPerThreadType.Browser",
kSamplingProfilerThreadBucket);
EXPECT_EQ(thread_cpu_seconds, 0);
metrics->PerformFullCollectionForTesting();
metrics->WaitForCollectionForTesting();
thread_cpu_seconds =
histograms.GetBucketCount("Power.CpuTimeSecondsPerThreadType.Browser",
kSamplingProfilerThreadBucket);
EXPECT_GE(thread_cpu_seconds, 1);
thread1.Stop();
ProcessCpuTimeMetrics::SetIgnoreHistogramAllocatorForTesting(false);
}
} // namespace
} // namespace internal
} // namespace content
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