linux-kernel - Re: [PATCH v2] sched/core: forced idle accounting

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Message-ID: <YYpYP919xlC0NX7/@hirez.programming.kicks-ass.net>
Date:   Tue, 9 Nov 2021 12:15:11 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Don <joshdon@...gle.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Vineeth Pillai <vineethrp@...il.com>,
        Hao Luo <haoluo@...gle.com>, Tao Zhou <tao.zhou@...ux.dev>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sched/core: forced idle accounting

On Mon, Oct 18, 2021 at 01:34:28PM -0700, Josh Don wrote:
> @@ -5804,6 +5830,12 @@ pick_next_task(struct rq *rq, struct task_struct *prev, struct rq_flags *rf)
>  		}
>  	}
>  
> +	if (rq->core->core_forceidle_count) {

Does this want to be something like:

	if (schedstat_enabled() && .. ) ?

afaict without schedstat on this is dead code.

> +		if (cookie)
> +			rq->core->core_forceidle_start = rq_clock(rq->core);
> +		rq->core->core_forceidle_occupation = occ;
> +	}
> +
>  	rq->core->core_pick_seq = rq->core->core_task_seq;
>  	next = rq->core_pick;
>  	rq->core_sched_seq = rq->core->core_pick_seq;