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Message-ID: <CAJuCfpHi=jN+8NF1n8-9U2b-Aw7hbt3NHgV=y55y=Wtd0FnRxQ@mail.gmail.com>
Date: Thu, 19 Oct 2023 09:07:50 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: yang.yang29@....com.cn
Cc: mingo@...nel.org, peterz@...radead.org, hannes@...xchg.org,
mingo@...hat.com, linux-kernel@...r.kernel.org,
juri.lelli@...hat.com
Subject: Re: [PATCH linux-next v3 3/4] sched/psi: update rtpoll_next_update
after update triggers and rtpoll_total
On Tue, Oct 10, 2023 at 1:43 AM <yang.yang29@....com.cn> wrote:
>
> From: Yang Yang <yang.yang29@....com.cn>
>
> Update group->rtpoll_next_update after called update_triggers() and
> update rtpoll_total. This will prevent bugs if update_triggers() uses
> group->rtpoll_next_update in the future, and it makes more sense
> to set the next update time after we finished the current update.
>
> Signed-off-by: Yang Yang <yang.yang29@....com.cn>
> Suggested-by: Suren Baghdasaryan <surenb@...gle.com>
I believe Ingo's version at
https://lore.kernel.org/all/ZScQZLTssSfq19Jm@gmail.com/ already
includes this change.
> ---
> kernel/sched/psi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
> index 143f8eb34f9d..79f8db0c6150 100644
> --- a/kernel/sched/psi.c
> +++ b/kernel/sched/psi.c
> @@ -704,12 +704,12 @@ static void psi_rtpoll_work(struct psi_group *group)
> }
>
> if (now >= group->rtpoll_next_update) {
> - group->rtpoll_next_update = now + group->rtpoll_min_period;
> if (changed_states & group->rtpoll_states) {
> update_triggers(group, now, &update_total, PSI_POLL);
> memcpy(group->rtpoll_total, group->total[PSI_POLL],
> sizeof(group->rtpoll_total));
> }
> + group->rtpoll_next_update = now + group->rtpoll_min_period;
> }
>
> psi_schedule_rtpoll_work(group,
> --
> 2.25.1
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