forked from mirrors/gecko-dev
101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/layout/LayoutTelemetryTools.h"
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#include "MainThreadUtils.h"
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#include "mozilla/EnumeratedArray.h"
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#include "mozilla/EnumeratedRange.h"
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#include "mozilla/Telemetry.h"
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namespace mozilla::layout_telemetry {
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using LayoutSubsystemDurations =
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EnumeratedArray<LayoutSubsystem, double, size_t(LayoutSubsystem::Count)>;
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struct PerTickData {
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constexpr PerTickData() = default;
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LayoutSubsystemDurations mLayoutSubsystemDurationMs{0.0, 0.0, 0.0,
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0.0, 0.0, 0.0};
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};
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static PerTickData sData;
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static AutoRecord* sCurrentRecord;
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// Returns the key name expected by telemetry. Keep to date with
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// toolkits/components/telemetry/Histograms.json.
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static nsLiteralCString SubsystemTelemetryKey(LayoutSubsystem aSubsystem) {
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switch (aSubsystem) {
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default:
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MOZ_CRASH("Unexpected LayoutSubsystem value");
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case LayoutSubsystem::Restyle:
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return "Restyle"_ns;
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case LayoutSubsystem::Reflow:
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return "ReflowOther"_ns;
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case LayoutSubsystem::ReflowFlex:
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return "ReflowFlex"_ns;
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case LayoutSubsystem::ReflowGrid:
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return "ReflowGrid"_ns;
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case LayoutSubsystem::ReflowTable:
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return "ReflowTable"_ns;
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case LayoutSubsystem::ReflowText:
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return "ReflowText"_ns;
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}
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}
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void PingPerTickTelemetry() {
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auto range =
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MakeEnumeratedRange(LayoutSubsystem::Restyle, LayoutSubsystem::Count);
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for (auto subsystem : range) {
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auto key = SubsystemTelemetryKey(subsystem);
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double& duration = sData.mLayoutSubsystemDurationMs[subsystem];
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if (duration > 0.0) {
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Telemetry::Accumulate(Telemetry::PRESSHELL_LAYOUT_TOTAL_MS_PER_TICK, key,
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static_cast<uint32_t>(duration));
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duration = 0.0;
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}
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}
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}
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AutoRecord::AutoRecord(LayoutSubsystem aSubsystem)
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: mParentRecord(sCurrentRecord), mSubsystem(aSubsystem) {
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MOZ_ASSERT(NS_IsMainThread());
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// If we're re-entering the same subsystem, don't update the current record.
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if (mParentRecord && mParentRecord->mSubsystem == mSubsystem) {
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return;
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}
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mStartTime = TimeStamp::Now();
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if (mParentRecord) {
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// If we're entering a new subsystem, record the amount of time spent in the
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// parent record before setting the new current record.
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mParentRecord->mDurationMs +=
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(mStartTime - mParentRecord->mStartTime).ToMilliseconds();
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}
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sCurrentRecord = this;
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}
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AutoRecord::~AutoRecord() {
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if (sCurrentRecord != this) {
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// If this record is not head of the list, do nothing.
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return;
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}
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TimeStamp now = TimeStamp::Now();
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mDurationMs += (now - mStartTime).ToMilliseconds();
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sData.mLayoutSubsystemDurationMs[mSubsystem] += mDurationMs;
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if (mParentRecord) {
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// Restart the parent recording from this point
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mParentRecord->mStartTime = now;
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}
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// Unlink this record from the current record list
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sCurrentRecord = mParentRecord;
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}
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} // namespace mozilla::layout_telemetry
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