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Deduct timeout execution time from a continuously regenerating execution budget. Then throttle timeouts by using that budget in TimeoutManager::MinSchedulingDelay to adjust the minimum value if the budget is negative. The minimum value is adjusted to be a value where the budget would have regenerated to be +0 ms. The execution budget is clamped by values in ms defined in prefs: * dom.timeout.background_throttling_max_budget: 50 * dom.timeout.foreground_throttling_max_budget: -1 A value equal or less than 0 means that the budget is infinite. The regeneration rate can be controlled by the following prefs: * dom.timeout.background_budget_regeneration_rate * dom.timeout.foreground_budget_regeneration_rate one each for foreground and background throttling. To not starve timeouts indefinitely we clamp the minimum delay using the pref: * dom.timeout.budget_throttling_max_delay: 15000 The feature is behind the pref: * dom.timeout.enable_budget_timer_throttling
49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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_dom_timeoutbudgetmanager_h
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#define mozilla_dom_timeoutbudgetmanager_h
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#include "mozilla/Telemetry.h"
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#include "mozilla/TimeStamp.h"
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namespace mozilla {
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namespace dom {
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class Timeout;
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class TimeoutBudgetManager
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{
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public:
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static TimeoutBudgetManager& Get();
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void StartRecording(const TimeStamp& aNow);
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void StopRecording();
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TimeDuration RecordExecution(const TimeStamp& aNow,
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const Timeout* aTimeout,
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bool aIsBackground);
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void MaybeCollectTelemetry(const TimeStamp& aNow);
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private:
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TimeoutBudgetManager() : mLastCollection(TimeStamp::Now()) {}
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struct TelemetryData
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{
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TimeDuration mForegroundTracking;
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TimeDuration mForegroundNonTracking;
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TimeDuration mBackgroundTracking;
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TimeDuration mBackgroundNonTracking;
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};
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void Accumulate(Telemetry::HistogramID aId, const TimeDuration& aSample);
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TelemetryData mTelemetryData;
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TimeStamp mStart;
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TimeStamp mLastCollection;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_timeoutbudgetmanager_h
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