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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/controller/highest_pmf_reporter.h"
#include <limits>
#include "base/metrics/histogram_functions.h"
#include "base/task/single_thread_task_runner.h"
#include "base/task/task_runner.h"
#include "base/time/default_tick_clock.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/core/loader/document_loader.h"
#include "third_party/blink/renderer/core/page/page.h"
namespace blink {
namespace {
constexpr size_t kMaxReportCount = 4;
constexpr std::array<const char*, kMaxReportCount> kHighestPmfMetricNames = {
"Memory.Experimental.Renderer.HighestPrivateMemoryFootprint.0to2min",
"Memory.Experimental.Renderer.HighestPrivateMemoryFootprint.2to4min",
"Memory.Experimental.Renderer.HighestPrivateMemoryFootprint.4to8min",
"Memory.Experimental.Renderer.HighestPrivateMemoryFootprint.8to16min"};
constexpr std::array<base::TimeDelta, kMaxReportCount> kTimeToReport = {
base::Minutes(2), base::Minutes(4), base::Minutes(8), base::Minutes(16)};
} // namespace
void HighestPmfReporter::Initialize(
scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
DEFINE_STATIC_LOCAL(HighestPmfReporter, reporter, (std::move(task_runner)));
(void)reporter;
}
HighestPmfReporter::HighestPmfReporter(
scoped_refptr<base::SingleThreadTaskRunner> task_runner)
: HighestPmfReporter(std::move(task_runner),
base::DefaultTickClock::GetInstance()) {}
HighestPmfReporter::HighestPmfReporter(
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
const base::TickClock* clock)
: task_runner_(std::move(task_runner)), clock_(clock) {
MemoryUsageMonitor::Instance().AddObserver(this);
}
bool HighestPmfReporter::FirstNavigationStarted() {
if (first_navigation_detected_)
return false;
for (Page* page : Page::OrdinaryPages()) {
Frame* frame = page->MainFrame();
if (!frame)
continue;
auto* local_frame = DynamicTo<LocalFrame>(frame);
if (!local_frame)
continue;
DocumentLoader* loader = local_frame->Loader().GetDocumentLoader();
if (!loader)
continue;
if (!loader->GetTiming().NavigationStart().is_null()) {
first_navigation_detected_ = true;
return true;
}
}
return false;
}
void HighestPmfReporter::OnMemoryPing(MemoryUsage usage) {
DCHECK(IsMainThread());
if (FirstNavigationStarted()) {
task_runner_->PostDelayedTask(
FROM_HERE,
WTF::BindOnce(&HighestPmfReporter::OnReportMetrics,
WTF::Unretained(this)),
kTimeToReport[0]);
}
if (current_highest_pmf_ > usage.private_footprint_bytes)
return;
current_highest_pmf_ = usage.private_footprint_bytes;
peak_resident_bytes_at_current_highest_pmf_ = usage.peak_resident_bytes;
webpage_counts_at_current_highest_pmf_ = Page::OrdinaryPages().size();
// TODO(tasak): Report the highest memory footprint throughout renderer's
// lifetime.
}
void HighestPmfReporter::OnReportMetrics() {
DCHECK(IsMainThread());
ReportMetrics();
// The following code is not accurate, because OnReportMetrics will be late
// when renderer is slow (e.g. caused by near-OOM or heavy tasks is running
// or ...). However such signal getting late by minutes is unlikely, so it's
// ok to say "this is good enough".
current_highest_pmf_ = 0.0;
peak_resident_bytes_at_current_highest_pmf_ = 0.0;
webpage_counts_at_current_highest_pmf_ = 0;
report_count_++;
if (report_count_ >= kMaxReportCount) {
// Stop observing the MemoryUsageMonitor once there's no more histogram to
// report.
MemoryUsageMonitor::Instance().RemoveObserver(this);
return;
}
base::TimeDelta delay =
kTimeToReport[report_count_] - kTimeToReport[report_count_ - 1];
task_runner_->PostDelayedTask(
FROM_HERE,
WTF::BindOnce(&HighestPmfReporter::OnReportMetrics,
WTF::Unretained(this)),
delay);
}
void HighestPmfReporter::ReportMetrics() {
base::UmaHistogramMemoryMB(kHighestPmfMetricNames[report_count_],
base::saturated_cast<base::Histogram::Sample32>(
current_highest_pmf_ / 1024 / 1024));
}
} // namespace blink
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