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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
| commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
| tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /xpcom/threads/CPUUsageWatcher.h | |
| parent | Initial commit. (diff) | |
| download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip | |
Adding upstream version 115.7.0esr.upstream/115.7.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'xpcom/threads/CPUUsageWatcher.h')
| -rw-r--r-- | xpcom/threads/CPUUsageWatcher.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/xpcom/threads/CPUUsageWatcher.h b/xpcom/threads/CPUUsageWatcher.h new file mode 100644 index 0000000000..c3a643378a --- /dev/null +++ b/xpcom/threads/CPUUsageWatcher.h @@ -0,0 +1,100 @@ +/* -*- 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 mozilla_CPUUsageWatcher_h +#define mozilla_CPUUsageWatcher_h + +#include <stdint.h> + +#include "mozilla/HangAnnotations.h" +#include "mozilla/Result.h" + +// We only support OSX and Windows, because on Linux we're forced to read +// from /proc/stat in order to get global CPU values. We would prefer to not +// eat that cost for this. +#if defined(NIGHTLY_BUILD) && (defined(XP_WIN) || defined(XP_MACOSX)) +# define CPU_USAGE_WATCHER_ACTIVE +#endif + +namespace mozilla { + +// Start error values at 1 to allow using the UnusedZero Result +// optimization. +enum CPUUsageWatcherError : uint8_t { + ClockGetTimeError = 1, + GetNumberOfProcessorsError, + GetProcessTimesError, + GetSystemTimesError, + HostStatisticsError, + ProcStatError, +}; + +namespace detail { + +template <> +struct UnusedZero<CPUUsageWatcherError> : UnusedZeroEnum<CPUUsageWatcherError> { +}; + +} // namespace detail + +class CPUUsageHangAnnotator : public BackgroundHangAnnotator { + public: +}; + +class CPUUsageWatcher : public BackgroundHangAnnotator { + public: +#ifdef CPU_USAGE_WATCHER_ACTIVE + CPUUsageWatcher() + : mInitialized(false), + mExternalUsageThreshold(0), + mExternalUsageRatio(0), + mProcessUsageTime(0), + mProcessUpdateTime(0), + mGlobalUsageTime(0), + mGlobalUpdateTime(0), + mNumCPUs(0) {} +#endif + + Result<Ok, CPUUsageWatcherError> Init(); + + void Uninit(); + + // Updates necessary values to allow AnnotateHang to function. This must be + // called on some semi-regular basis, as it will calculate the mean CPU + // usage values between now and the last time it was called. + Result<Ok, CPUUsageWatcherError> CollectCPUUsage(); + + void AnnotateHang(BackgroundHangAnnotations& aAnnotations) final; + + private: +#ifdef CPU_USAGE_WATCHER_ACTIVE + bool mInitialized; + // The threshold above which we will mark a hang as occurring under high + // external CPU usage conditions + float mExternalUsageThreshold; + // The CPU usage (0-1) external to our process, averaged between the two + // most recent monitor thread runs + float mExternalUsageRatio; + // The total cumulative CPU usage time by our process as of the last + // CollectCPUUsage or Startup + uint64_t mProcessUsageTime; + // A time value in the same units as mProcessUsageTime used to + // determine the ratio of CPU usage time to idle time + uint64_t mProcessUpdateTime; + // The total cumulative CPU usage time by all processes as of the last + // CollectCPUUsage or Startup + uint64_t mGlobalUsageTime; + // A time value in the same units as mGlobalUsageTime used to + // determine the ratio of CPU usage time to idle time + uint64_t mGlobalUpdateTime; + // The number of virtual cores on our machine + uint64_t mNumCPUs; +#endif +}; + +} // namespace mozilla + +#endif // mozilla_CPUUsageWatcher_h |