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/* -*- 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/. */
#ifndef PerfStats_h
#define PerfStats_h
#include "mozilla/TimeStamp.h"
#include "mozilla/StaticMutex.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/MozPromise.h"
#include <memory>
#include <string>
#include <limits>
// PerfStats
//
// Framework for low overhead selective collection of internal performance
// metrics through ChromeUtils.
//
// Gathering: in C++, wrap execution in an RAII class
// PerfStats::AutoMetricRecording<PerfStats::Metric::MyMetric> or call
// PerfStats::RecordMeasurement{Start,End} manually. Use
// RecordMeasurementCount() for incrementing counters.
//
// Controlling: Use ChromeUtils.SetPerfStatsCollectionMask(mask), where mask=0
// disables all metrics and mask=0xFFFFFFFF enables all of them.
//
// Reporting: Results can be accessed with ChromeUtils.CollectPerfStats().
// Browsertime will sum results across processes and report them.
// Define a new metric by adding it to this list. It will be created as a class
// enum value mozilla::PerfStats::Metric::MyMetricName.
#define FOR_EACH_PERFSTATS_METRIC(MACRO) \
MACRO(DisplayListBuilding) \
MACRO(Rasterizing) \
MACRO(WrDisplayListBuilding) \
MACRO(LayerTransactions) \
MACRO(Compositing) \
MACRO(Reflowing) \
MACRO(Styling) \
MACRO(HttpChannelCompletion) \
MACRO(HttpChannelCompletion_Network) \
MACRO(HttpChannelCompletion_Cache) \
MACRO(HttpChannelAsyncOpenToTransactionPending) \
MACRO(HttpChannelResponseStartParentToContent) \
MACRO(HttpChannelResponseEndParentToContent) \
MACRO(JSBC_Compression) \
MACRO(JSBC_Decompression) \
MACRO(JSBC_IO_Read) \
MACRO(JSBC_IO_Write) \
MACRO(MinorGC) \
MACRO(MajorGC) \
MACRO(NonIdleMajorGC)
namespace mozilla {
namespace dom {
// Forward declaration.
class ContentParent;
} // namespace dom
class PerfStats {
public:
typedef MozPromise<nsCString, bool, true> PerfStatsPromise;
enum class Metric : uint32_t {
#define DECLARE_ENUM(metric) metric,
FOR_EACH_PERFSTATS_METRIC(DECLARE_ENUM)
#undef DECLARE_ENUM
Max
};
// MetricMask is a bitmask based on 'Metric', i.e. Metric::LayerBuilding (2)
// is synonymous to 1 << 2 in MetricMask.
using MetricMask = uint64_t;
static void RecordMeasurementStart(Metric aMetric) {
if (!(sCollectionMask & (1 << static_cast<uint64_t>(aMetric)))) {
return;
}
RecordMeasurementStartInternal(aMetric);
}
static void RecordMeasurementEnd(Metric aMetric) {
if (!(sCollectionMask & (1 << static_cast<uint64_t>(aMetric)))) {
return;
}
RecordMeasurementEndInternal(aMetric);
}
static void RecordMeasurement(Metric aMetric, TimeDuration aDuration) {
if (!(sCollectionMask & (1 << static_cast<uint64_t>(aMetric)))) {
return;
}
RecordMeasurementInternal(aMetric, aDuration);
}
static void RecordMeasurementCounter(Metric aMetric,
uint64_t aIncrementAmount) {
if (!(sCollectionMask & (1 << static_cast<uint64_t>(aMetric)))) {
return;
}
RecordMeasurementCounterInternal(aMetric, aIncrementAmount);
}
template <Metric N>
class AutoMetricRecording {
public:
AutoMetricRecording() { PerfStats::RecordMeasurementStart(N); }
~AutoMetricRecording() { PerfStats::RecordMeasurementEnd(N); }
};
static void SetCollectionMask(MetricMask aMask);
static MetricMask GetCollectionMask();
static RefPtr<PerfStatsPromise> CollectPerfStatsJSON() {
return GetSingleton()->CollectPerfStatsJSONInternal();
}
static nsCString CollectLocalPerfStatsJSON() {
return GetSingleton()->CollectLocalPerfStatsJSONInternal();
}
static void StorePerfStats(dom::ContentParent* aParent,
const nsACString& aPerfStats) {
GetSingleton()->StorePerfStatsInternal(aParent, aPerfStats);
}
private:
static PerfStats* GetSingleton();
static void RecordMeasurementStartInternal(Metric aMetric);
static void RecordMeasurementEndInternal(Metric aMetric);
static void RecordMeasurementInternal(Metric aMetric, TimeDuration aDuration);
static void RecordMeasurementCounterInternal(Metric aMetric,
uint64_t aIncrementAmount);
void ResetCollection();
void StorePerfStatsInternal(dom::ContentParent* aParent,
const nsACString& aPerfStats);
RefPtr<PerfStatsPromise> CollectPerfStatsJSONInternal();
nsCString CollectLocalPerfStatsJSONInternal();
static MetricMask sCollectionMask;
static StaticMutex sMutex MOZ_UNANNOTATED;
static StaticAutoPtr<PerfStats> sSingleton;
TimeStamp mRecordedStarts[static_cast<size_t>(Metric::Max)];
double mRecordedTimes[static_cast<size_t>(Metric::Max)];
uint32_t mRecordedCounts[static_cast<size_t>(Metric::Max)];
nsTArray<nsCString> mStoredPerfStats;
};
static_assert(1 << (static_cast<uint64_t>(PerfStats::Metric::Max) - 1) <=
std::numeric_limits<PerfStats::MetricMask>::max(),
"More metrics than can fit into sCollectionMask bitmask");
} // namespace mozilla
#endif // PerfStats_h
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