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clutter/frame-clock: Limit jitter measurements to one frame interval (100%)

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Measurements above 100% were originally allowed to show when frame skipping
was occurring so you didn't have to also check the frame rate. But that
also resulted in arbitrarily high jitter values being reported when
returning from idle. And those are frequent enough to look like a bug or
untrustworthy so let's not do that anymore.

Taking the remainder of a high jitter value is still a meaningful jitter
value.

Fixes: https://gitlab.gnome.org/GNOME/mutter/-/issues/2906
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3123>
This commit is contained in:
Daniel van Vugt 2023-07-18 14:10:34 +08:00 committed by Marge Bot
parent 7faf4a308e
commit 7c0caf5727
1 changed files with 2 additions and 1 deletions
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clutter/clutter/clutter-frame-clock.c
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@ -745,7 +745,8 @@ clutter_frame_clock_dispatch (ClutterFrameClock *frame_clock,
dispatch_interval_us = time_us - frame_clock->last_dispatch_time_us;
jitter_us = llabs (dispatch_interval_us -
frame_clock->last_dispatch_interval_us);
frame_clock->last_dispatch_interval_us) %
frame_clock->refresh_interval_us;
frame_clock->last_dispatch_interval_us = dispatch_interval_us;
CLUTTER_NOTE (FRAME_TIMINGS, "dispatch jitter %5ldµs (%3ld%%)",
jitter_us,