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sched/psi: Avoid updating PSI triggers and ->rtpoll_total when there are no state changes

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When psimon wakes up and there are no state changes for ->rtpoll_states,
it's unnecessary to update triggers and ->rtpoll_total because the pressures
being monitored by the user have not changed.

This will help to slightly reduce unnecessary computations of PSI.

[ mingo: Changelog updates ]

Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Peter Ziljstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/202310101641075436843@zte.com.cn
This commit is contained in:
Yang Yang 2023-10-10 16:41:07 +08:00 committed by Ingo Molnar
parent b19fdb16fb
commit 80cc1d1d5e
1 changed files with 4 additions and 3 deletions
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5
kernel/sched/psi.c
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@ -704,12 +704,13 @@ static void psi_rtpoll_work(struct psi_group *group)
} }
if (now >= group->rtpoll_next_update) { if (now >= group->rtpoll_next_update) {
if (changed_states & group->rtpoll_states) {
update_triggers(group, now, &update_total, PSI_POLL); update_triggers(group, now, &update_total, PSI_POLL);
group->rtpoll_next_update = now + group->rtpoll_min_period;
if (update_total)
memcpy(group->rtpoll_total, group->total[PSI_POLL], memcpy(group->rtpoll_total, group->total[PSI_POLL],
sizeof(group->rtpoll_total)); sizeof(group->rtpoll_total));
} }
group->rtpoll_next_update = now + group->rtpoll_min_period;
}
psi_schedule_rtpoll_work(group, psi_schedule_rtpoll_work(group,
nsecs_to_jiffies(group->rtpoll_next_update - now) + 1, nsecs_to_jiffies(group->rtpoll_next_update - now) + 1,