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Message-ID: <82689dd6-9db1-dd00-069b-73a637a21126@arm.com>
Date: Thu, 5 Jan 2023 12:33:16 +0100
From: Dietmar Eggemann <dietmar.eggemann@....com>
To: Chen Yu <yu.c.chen@...el.com>,
Peter Zijlstra <peterz@...radead.org>,
Vincent Guittot <vincent.guittot@...aro.org>,
Tim Chen <tim.c.chen@...el.com>,
Mel Gorman <mgorman@...hsingularity.net>
Cc: Juri Lelli <juri.lelli@...hat.com>,
Rik van Riel <riel@...riel.com>,
Aaron Lu <aaron.lu@...el.com>,
Abel Wu <wuyun.abel@...edance.com>,
K Prateek Nayak <kprateek.nayak@....com>,
Yicong Yang <yangyicong@...ilicon.com>,
"Gautham R . Shenoy" <gautham.shenoy@....com>,
Ingo Molnar <mingo@...hat.com>,
Steven Rostedt <rostedt@...dmis.org>,
Ben Segall <bsegall@...gle.com>,
Daniel Bristot de Oliveira <bristot@...hat.com>,
Valentin Schneider <vschneid@...hat.com>,
Hillf Danton <hdanton@...a.com>,
Honglei Wang <wanghonglei@...ichuxing.com>,
Len Brown <len.brown@...el.com>,
Chen Yu <yu.chen.surf@...il.com>,
Tianchen Ding <dtcccc@...ux.alibaba.com>,
Joel Fernandes <joel@...lfernandes.org>,
Josh Don <joshdon@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v4 1/2] sched/fair: Introduce short duration task
check
On 16/12/2022 07:11, Chen Yu wrote:
[...]
> @@ -5995,6 +6005,18 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
>
> static void set_next_buddy(struct sched_entity *se);
>
> +static inline void dur_avg_update(struct task_struct *p, bool task_sleep)
> +{
> + u64 dur;
> +
> + if (!task_sleep)
> + return;
> +
> + dur = p->se.sum_exec_runtime - p->se.prev_sum_exec_runtime_vol;
> + p->se.prev_sum_exec_runtime_vol = p->se.sum_exec_runtime;
Shouldn't se->prev_sum_exec_runtime_vol be set in enqueue_task_fair()
and not in dequeue_task_fair()->dur_avg_update()? Otherwise `dur` will
contain sleep time.
Like we do for se->prev_sum_exec_runtime in set_next_entity() but for
one `set_next_entity()-put_prev_entity()` run section.
AFAICS, you want to measure the exec_runtime sum over all run sections
between enqueue and dequeue.
> + update_avg(&p->se.dur_avg, dur);
> +}
> +
[...]
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