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sched/psi: Avoid updating PSI triggers and ->rtpoll_total when there are no state changes
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
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1 changed files with 4 additions and 3 deletions
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@ -704,12 +704,13 @@ static void psi_rtpoll_work(struct psi_group *group)
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}
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}
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if (now >= group->rtpoll_next_update) {
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if (now >= group->rtpoll_next_update) {
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if (changed_states & group->rtpoll_states) {
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update_triggers(group, now, &update_total, PSI_POLL);
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update_triggers(group, now, &update_total, PSI_POLL);
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group->rtpoll_next_update = now + group->rtpoll_min_period;
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if (update_total)
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memcpy(group->rtpoll_total, group->total[PSI_POLL],
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memcpy(group->rtpoll_total, group->total[PSI_POLL],
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sizeof(group->rtpoll_total));
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sizeof(group->rtpoll_total));
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}
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}
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group->rtpoll_next_update = now + group->rtpoll_min_period;
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}
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psi_schedule_rtpoll_work(group,
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psi_schedule_rtpoll_work(group,
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nsecs_to_jiffies(group->rtpoll_next_update - now) + 1,
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nsecs_to_jiffies(group->rtpoll_next_update - now) + 1,
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