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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
| commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
| tree | f435a8308119effd964b339f76abb83a57c29483 /xpcom/threads/MainThreadIdlePeriod.cpp | |
| parent | Initial commit. (diff) | |
| download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip | |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'xpcom/threads/MainThreadIdlePeriod.cpp')
| -rw-r--r-- | xpcom/threads/MainThreadIdlePeriod.cpp | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/xpcom/threads/MainThreadIdlePeriod.cpp b/xpcom/threads/MainThreadIdlePeriod.cpp new file mode 100644 index 0000000000..805626dd67 --- /dev/null +++ b/xpcom/threads/MainThreadIdlePeriod.cpp @@ -0,0 +1,77 @@ +/* -*- 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 "MainThreadIdlePeriod.h" + +#include "mozilla/Maybe.h" +#include "mozilla/Preferences.h" +#include "mozilla/StaticPrefs_idle_period.h" +#include "mozilla/dom/Document.h" +#include "VRManagerChild.h" +#include "nsRefreshDriver.h" +#include "nsThreadUtils.h" + +// The amount of idle time (milliseconds) reserved for a long idle period. +static const double kLongIdlePeriodMS = 50.0; + +// The minimum amount of time (milliseconds) required for an idle period to be +// scheduled on the main thread. N.B. layout.idle_period.time_limit adds +// padding at the end of the idle period, which makes the point in time that we +// expect to become busy again be: +// now + idle_period.min + layout.idle_period.time_limit +// or during page load +// now + idle_period.during_page_load.min + layout.idle_period.time_limit + +static const uint32_t kMaxTimerThreadBound = 25; // Number of timers to check. + +namespace mozilla { + +NS_IMETHODIMP +MainThreadIdlePeriod::GetIdlePeriodHint(TimeStamp* aIdleDeadline) { + MOZ_ASSERT(NS_IsMainThread()); + MOZ_ASSERT(aIdleDeadline); + + TimeStamp now = TimeStamp::Now(); + TimeStamp currentGuess = + now + TimeDuration::FromMilliseconds(kLongIdlePeriodMS); + + currentGuess = nsRefreshDriver::GetIdleDeadlineHint( + currentGuess, nsRefreshDriver::IdleCheck::AllVsyncListeners); + if (XRE_IsContentProcess()) { + currentGuess = gfx::VRManagerChild::GetIdleDeadlineHint(currentGuess); + } + currentGuess = NS_GetTimerDeadlineHintOnCurrentThread(currentGuess, + kMaxTimerThreadBound); + + // If the idle period is too small, then just return a null time + // to indicate we are busy. Otherwise return the actual deadline. + double highRateMultiplier = nsRefreshDriver::HighRateMultiplier(); + TimeDuration minIdlePeriod = TimeDuration::FromMilliseconds( + std::max(highRateMultiplier * StaticPrefs::idle_period_min(), 1.0)); + bool busySoon = currentGuess.IsNull() || + (now >= (currentGuess - minIdlePeriod)) || + currentGuess < mLastIdleDeadline; + + // During page load use higher minimum idle period. + if (!busySoon && XRE_IsContentProcess() && + mozilla::dom::Document::HasRecentlyStartedForegroundLoads()) { + TimeDuration minIdlePeriod = TimeDuration::FromMilliseconds(std::max( + highRateMultiplier * StaticPrefs::idle_period_during_page_load_min(), + 1.0)); + busySoon = (now >= (currentGuess - minIdlePeriod)); + } + + if (!busySoon) { + *aIdleDeadline = mLastIdleDeadline = currentGuess; + } + + return NS_OK; +} + +/* static */ +float MainThreadIdlePeriod::GetLongIdlePeriod() { return kLongIdlePeriodMS; } + +} // namespace mozilla |