From: Suren Baghdasaryan <surenb@google.com>
To: yang.yang29@zte.com.cn
Cc: mingo@kernel.org, peterz@infradead.org, hannes@cmpxchg.org,
mingo@redhat.com, linux-kernel@vger.kernel.org,
juri.lelli@redhat.com
Subject: Re: [PATCH linux-next v3 1/4] sched/psi: Change update_triggers() to a 'void' function
Date: Thu, 19 Oct 2023 09:01:17 -0700 [thread overview]
Message-ID: <CAJuCfpFwAexdhHubUjrDxs9er7npX6JtX6B78Vkj_pZ+B-1uAw@mail.gmail.com> (raw)
In-Reply-To: <202310101636345668937@zte.com.cn>
On Tue, Oct 10, 2023 at 1:36 AM <yang.yang29@zte.com.cn> wrote:
>
> From: Yang Yang <yang.yang29@zte.com.cn>
>
> Update_triggers() always returns now + group->rtpoll_min_period, and the
> return value is only used by psi_rtpoll_work(), so change update_triggers()
> to a void function, let group->rtpoll_next_update = now +
> group->rtpoll_min_period directly.
>
> This will avoid unnecessary function return value passing & simplifies
> the function.
>
> Suggested-by: Suren Baghdasaryan <surenb@google.com>
> Signed-off-by: Yang Yang <yang.yang29@zte.com.cn>
Sorry for the delay, I was traveling and just got back. I think Ingo
already applied this patch but FWIW
Acked-by: Suren Baghdasaryan <surenb@google.com>
> ---
> kernel/sched/psi.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/kernel/sched/psi.c b/kernel/sched/psi.c
> index 1d0f634725a6..be853f227e40 100644
> --- a/kernel/sched/psi.c
> +++ b/kernel/sched/psi.c
> @@ -434,7 +434,7 @@ static u64 window_update(struct psi_window *win, u64 now, u64 value)
> return growth;
> }
>
> -static u64 update_triggers(struct psi_group *group, u64 now, bool *update_total,
> +static void update_triggers(struct psi_group *group, u64 now, bool *update_total,
> enum psi_aggregators aggregator)
> {
> struct psi_trigger *t;
> @@ -503,8 +503,6 @@ static u64 update_triggers(struct psi_group *group, u64 now, bool *update_total,
> /* Reset threshold breach flag once event got generated */
> t->pending_event = false;
> }
> -
> - return now + group->rtpoll_min_period;
> }
>
> static u64 update_averages(struct psi_group *group, u64 now)
> @@ -706,7 +704,8 @@ static void psi_rtpoll_work(struct psi_group *group)
> }
>
> if (now >= group->rtpoll_next_update) {
> - group->rtpoll_next_update = 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],
> sizeof(group->rtpoll_total));
> --
> 2.25.1
next prev parent reply other threads:[~2023-10-19 16:01 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-13 12:44 [PATCH linux-next] sched/psi: Avoid update triggers and rtpoll_total when it is unnecessary yang.yang29
2023-09-13 23:01 ` Suren Baghdasaryan
2023-09-14 2:02 ` yang.yang29
2023-09-14 5:53 ` yang.yang29
2023-09-14 9:10 ` yang.yang29
2023-09-27 0:14 ` Suren Baghdasaryan
2023-09-27 1:56 ` yang.yang29
2023-09-30 22:32 ` Suren Baghdasaryan
2023-10-07 6:21 ` [PATCH linux-next v2] " yang.yang29
2023-10-09 10:49 ` Ingo Molnar
2023-10-09 12:19 ` [PATCH linux-next 0/3] sched/psi: Optimize the process of updating triggers and rtpoll_total yang.yang29
2023-10-09 12:24 ` [PATCH linux-next 1/3] sched/psi: Change update_triggers() to a void function yang.yang29
2023-10-09 12:48 ` Ingo Molnar
2023-10-09 12:59 ` [tip: sched/core] sched/psi: Change update_triggers() to a 'void' function tip-bot2 for Yang Yang
2023-10-09 12:30 ` [PATCH linux-next 2/3] sched/psi: Avoid update triggers and rtpoll_total when it is unnecessary yang.yang29
2023-10-09 12:52 ` Ingo Molnar
2023-10-09 17:42 ` Suren Baghdasaryan
2023-10-10 2:12 ` yang.yang29
2023-10-10 3:05 ` [PATCH linux-next v2 0/4] sched/psi: Optimize the process of updating triggers and rtpoll_total yang.yang29
2023-10-10 3:09 ` [PATCH linux-next v2 1/4] sched/psi: Change update_triggers() to a 'void' function yang.yang29
2023-10-10 7:38 ` Ingo Molnar
2023-10-10 8:31 ` [PATCH linux-next v3 0/4] sched/psi: Optimize the process of updating triggers and rtpoll_total yang.yang29
2023-10-10 8:36 ` [PATCH linux-next v3 1/4] sched/psi: Change update_triggers() to a 'void' function yang.yang29
2023-10-19 16:01 ` Suren Baghdasaryan [this message]
2023-10-10 8:41 ` [PATCH linux-next v3 2/4] sched/psi: Avoid update triggers and rtpoll_total when it is unnecessary yang.yang29
2023-10-11 21:15 ` Ingo Molnar
2023-10-12 2:13 ` yang.yang29
2023-10-19 16:04 ` Suren Baghdasaryan
2023-10-11 21:20 ` [tip: sched/core] sched/psi: Avoid updating PSI triggers and ->rtpoll_total when there are no state changes tip-bot2 for Yang Yang
2023-10-10 8:42 ` [PATCH linux-next v3 3/4] sched/psi: update rtpoll_next_update after update triggers and rtpoll_total yang.yang29
2023-10-19 16:07 ` Suren Baghdasaryan
2023-10-10 8:45 ` [PATCH linux-next v3 4/4] sched/psi: Delete the function parameter update_total of update_triggers() yang.yang29
2023-10-11 21:20 ` [tip: sched/core] sched/psi: Delete the 'update_total' function parameter from update_triggers() tip-bot2 for Yang Yang
2023-10-19 16:09 ` [PATCH linux-next v3 4/4] sched/psi: Delete the function parameter update_total of update_triggers() Suren Baghdasaryan
2023-10-10 3:20 ` [PATCH linux-next v2 2/4] sched/psi: Avoid update triggers and rtpoll_total when it is unnecessary yang.yang29
2023-10-10 3:24 ` [PATCH linux-next v2 3/4] sched/psi: update rtpoll_next_update after update triggers and rtpoll_total yang.yang29
2023-10-10 3:28 ` [PATCH linux-next v2 4/4] sched/psi: Delete the function parameter update_total of update_triggers() yang.yang29
2023-10-09 12:37 ` [PATCH linux-next 3/3] " yang.yang29
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