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114 lines
3.0 KiB
C++
114 lines
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
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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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#ifndef mozilla_BackgroundHangTelemetry_h
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#define mozilla_BackgroundHangTelemetry_h
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#include "mozilla/Array.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/Move.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/PodOperations.h"
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#include "mozilla/Vector.h"
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#include "nsString.h"
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#include "prinrval.h"
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namespace mozilla {
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namespace Telemetry {
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static const size_t kTimeHistogramBuckets = 8 * sizeof(PRIntervalTime);
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/* TimeHistogram is an efficient histogram that puts time durations into
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exponential (base 2) buckets; times are accepted in PRIntervalTime and
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stored in milliseconds. */
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class TimeHistogram : public mozilla::Array<uint32_t, kTimeHistogramBuckets>
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{
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public:
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TimeHistogram()
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{
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mozilla::PodArrayZero(*this);
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}
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// Get minimum (inclusive) range of bucket in milliseconds
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uint32_t GetBucketMin(size_t aBucket) const {
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MOZ_ASSERT(aBucket < ArrayLength(*this));
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return (1u << aBucket) & ~1u; // Bucket 0 starts at 0, not 1
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}
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// Get maximum (inclusive) range of bucket in milliseconds
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uint32_t GetBucketMax(size_t aBucket) const {
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MOZ_ASSERT(aBucket < ArrayLength(*this));
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return (1u << (aBucket + 1u)) - 1u;
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}
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void Add(PRIntervalTime aTime);
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};
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/* A hang histogram consists of a stack associated with the
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hang, along with a time histogram of the hang times. */
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class HangHistogram : public TimeHistogram
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{
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public:
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typedef mozilla::Vector<const char*, 8> Stack;
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private:
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static uint32_t GetHash(const Stack& aStack);
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Stack mStack;
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// Use a hash to speed comparisons
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const uint32_t mHash;
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public:
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explicit HangHistogram(Stack&& aStack)
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: mStack(mozilla::Move(aStack))
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, mHash(GetHash(mStack))
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{
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}
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HangHistogram(HangHistogram&& aOther)
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: TimeHistogram(mozilla::Move(aOther))
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, mStack(mozilla::Move(aOther.mStack))
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, mHash(mozilla::Move(aOther.mHash))
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{
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}
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bool operator==(const HangHistogram& aOther) const;
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bool operator!=(const HangHistogram& aOther) const
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{
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return !operator==(aOther);
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}
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const Stack& GetStack() const {
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return mStack;
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}
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};
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/* Thread hang stats consist of
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- thread name
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- time histogram of all task run times
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- hang histograms of individual hangs. */
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class ThreadHangStats
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{
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private:
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nsAutoCString mName;
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public:
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TimeHistogram mActivity;
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mozilla::Vector<HangHistogram, 4> mHangs;
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explicit ThreadHangStats(const char* aName)
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: mName(aName)
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{
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}
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ThreadHangStats(ThreadHangStats&& aOther)
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: mName(mozilla::Move(aOther.mName))
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, mActivity(mozilla::Move(aOther.mActivity))
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, mHangs(mozilla::Move(aOther.mHangs))
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{
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}
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const char* GetName() const {
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return mName.get();
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}
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};
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} // namespace Telemetry
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} // namespace mozilla
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#endif // mozilla_BackgroundHangTelemetry_h
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