https://bugs.kde.org/show_bug.cgi?id=513066
Bug ID: 513066
Summary: Very high CPU usage in
KWin::SubSurfaceInterface::parentApplyState
Classification: Plasma
Product: kwin
Version First 6.5.3
Reported In:
Platform: NixOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
Randomly, usually after kwin_wayland has been running for a few hours,
kwin_wayland will spike up to 60-90% CPU usage. Based on `perf top`, this is
almost entirely spent in KWin::SubSurfaceInterface::parentApplyState
(specifically, in QHash<KWin::SubSurfaceInterface*, QPoint>::tryEmplace_impl).
STEPS TO REPRODUCE
1. Log in
2. Wait a few hours
OBSERVED RESULT
kwin_wayland spikes to high CPU usage, resulting in fans spinning up.
EXPECTED RESULT
kwin_wayland's resource usage remains reasonable.
SOFTWARE/OS VERSIONS
Operating System: NixOS 26.05
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
Kernel Version: 6.17.9 (64-bit)
Graphics Platform: Wayland
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