Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 177 insertions, 0 deletions

diff --git a/layout/base/LayoutTelemetryTools.cpp b/layout/base/LayoutTelemetryTools.cpp
new file mode 100644
index 0000000000..b59b73f810
--- /dev/null
+++ b/layout/base/LayoutTelemetryTools.cpp
@@ -0,0 +1,177 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/layout/LayoutTelemetryTools.h"
+
+#include "MainThreadUtils.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/PodOperations.h"
+#include "mozilla/Telemetry.h"
+
+using namespace mozilla;
+using namespace mozilla::layout_telemetry;
+
+// Returns the key name expected by telemetry. Keep to date with
+// toolkits/components/telemetry/Histograms.json.
+static nsLiteralCString SubsystemTelemetryKey(LayoutSubsystem aSubsystem) {
+  switch (aSubsystem) {
+    default:
+      MOZ_CRASH("Unexpected LayoutSubsystem value");
+    case LayoutSubsystem::Restyle:
+      return "Restyle"_ns;
+    case LayoutSubsystem::Reflow:
+      return "ReflowOther"_ns;
+    case LayoutSubsystem::ReflowFlex:
+      return "ReflowFlex"_ns;
+    case LayoutSubsystem::ReflowGrid:
+      return "ReflowGrid"_ns;
+    case LayoutSubsystem::ReflowTable:
+      return "ReflowTable"_ns;
+    case LayoutSubsystem::ReflowText:
+      return "ReflowText"_ns;
+  }
+}
+
+static AutoRecord* sCurrentRecord;
+
+static FlushKind ToKind(FlushType aFlushType) {
+  switch (aFlushType) {
+    default:
+      MOZ_CRASH("Expected FlushType::Style or FlushType::Layout");
+    case FlushType::Style:
+      return FlushKind::Style;
+    case FlushType::Layout:
+      return FlushKind::Layout;
+  }
+}
+
+namespace mozilla {
+namespace layout_telemetry {
+
+Data::Data() {
+  PodZero(&mReqsPerFlush);
+  PodZero(&mFlushesPerTick);
+  PodZero(&mLayoutSubsystemDurationMs);
+}
+
+void Data::IncReqsPerFlush(FlushType aFlushType) {
+  mReqsPerFlush[ToKind(aFlushType)]++;
+}
+
+void Data::IncFlushesPerTick(FlushType aFlushType) {
+  mFlushesPerTick[ToKind(aFlushType)]++;
+}
+
+void Data::PingReqsPerFlushTelemetry(FlushType aFlushType) {
+  auto flushKind = ToKind(aFlushType);
+  if (flushKind == FlushKind::Layout) {
+    auto styleFlushReqs = mReqsPerFlush[FlushKind::Style].value();
+    auto layoutFlushReqs = mReqsPerFlush[FlushKind::Layout].value();
+    Telemetry::Accumulate(Telemetry::PRESSHELL_REQS_PER_LAYOUT_FLUSH,
+                          "Style"_ns, styleFlushReqs);
+    Telemetry::Accumulate(Telemetry::PRESSHELL_REQS_PER_LAYOUT_FLUSH,
+                          "Layout"_ns, layoutFlushReqs);
+    mReqsPerFlush[FlushKind::Style] = SaturateUint8(0);
+    mReqsPerFlush[FlushKind::Layout] = SaturateUint8(0);
+  } else {
+    auto styleFlushReqs = mReqsPerFlush[FlushKind::Style].value();
+    Telemetry::Accumulate(Telemetry::PRESSHELL_REQS_PER_STYLE_FLUSH,
+                          styleFlushReqs);
+    mReqsPerFlush[FlushKind::Style] = SaturateUint8(0);
+  }
+}
+
+void Data::PingFlushPerTickTelemetry(FlushType aFlushType) {
+  auto flushKind = ToKind(aFlushType);
+  auto styleFlushes = mFlushesPerTick[FlushKind::Style].value();
+  if (styleFlushes > 0) {
+    Telemetry::Accumulate(Telemetry::PRESSHELL_FLUSHES_PER_TICK, "Style"_ns,
+                          styleFlushes);
+    mFlushesPerTick[FlushKind::Style] = SaturateUint8(0);
+  }
+
+  auto layoutFlushes = mFlushesPerTick[FlushKind::Layout].value();
+  if (flushKind == FlushKind::Layout && layoutFlushes > 0) {
+    Telemetry::Accumulate(Telemetry::PRESSHELL_FLUSHES_PER_TICK, "Layout"_ns,
+                          layoutFlushes);
+    mFlushesPerTick[FlushKind::Layout] = SaturateUint8(0);
+  }
+}
+
+void Data::PingTotalMsPerTickTelemetry(FlushType aFlushType) {
+  auto flushKind = ToKind(aFlushType);
+  auto range = (flushKind == FlushKind::Style)
+                   ? MakeEnumeratedRange(LayoutSubsystem::Restyle,
+                                         LayoutSubsystem::Reflow)
+                   : MakeEnumeratedRange(LayoutSubsystem::Reflow,
+                                         LayoutSubsystem::Count);
+
+  for (auto subsystem : range) {
+    auto key = SubsystemTelemetryKey(subsystem);
+    double& duration = mLayoutSubsystemDurationMs[subsystem];
+    if (duration > 0.0) {
+      Telemetry::Accumulate(Telemetry::PRESSHELL_LAYOUT_TOTAL_MS_PER_TICK, key,
+                            static_cast<uint32_t>(duration));
+      duration = 0.0;
+    }
+  }
+}
+
+void Data::PingPerTickTelemetry(FlushType aFlushType) {
+  PingFlushPerTickTelemetry(aFlushType);
+  PingTotalMsPerTickTelemetry(aFlushType);
+}
+
+AutoRecord::AutoRecord(LayoutSubsystem aSubsystem)
+    : AutoRecord(nullptr, aSubsystem) {}
+
+AutoRecord::AutoRecord(Data* aLayoutTelemetry, LayoutSubsystem aSubsystem)
+    : mParentRecord(sCurrentRecord),
+      mLayoutTelemetry(aLayoutTelemetry),
+      mSubsystem(aSubsystem),
+      mStartTime(TimeStamp::Now()),
+      mDurationMs(0.0) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  // If we're re-entering the same subsystem, don't update the current record.
+  if (mParentRecord) {
+    if (mParentRecord->mSubsystem == mSubsystem) {
+      return;
+    }
+
+    mLayoutTelemetry = mParentRecord->mLayoutTelemetry;
+    MOZ_ASSERT(mLayoutTelemetry);
+
+    // If we're entering a new subsystem, record the amount of time spent in the
+    // parent record before setting the new current record.
+    mParentRecord->mDurationMs +=
+        (mStartTime - mParentRecord->mStartTime).ToMilliseconds();
+  }
+
+  sCurrentRecord = this;
+}
+
+AutoRecord::~AutoRecord() {
+  if (sCurrentRecord != this) {
+    // If this record is not head of the list, do nothing.
+    return;
+  }
+
+  TimeStamp now = TimeStamp::Now();
+  mDurationMs += (now - mStartTime).ToMilliseconds();
+  mLayoutTelemetry->mLayoutSubsystemDurationMs[mSubsystem] += mDurationMs;
+
+  if (mParentRecord) {
+    // Restart the parent recording from this point
+    mParentRecord->mStartTime = now;
+  }
+
+  // Unlink this record from the current record list
+  sCurrentRecord = mParentRecord;
+}
+
+}  // namespace layout_telemetry
+}  // namespace mozilla