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

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Date:   Tue, 9 Nov 2021 11:20:57 +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:
> @@ -280,6 +288,8 @@ static void __sched_core_flip(bool enabled)
>  		for_each_cpu(t, smt_mask)
>  			cpu_rq(t)->core_enabled = enabled;
>  
> +		cpu_rq(cpu)->core->core_forceidle_start = 0;
> +
>  		sched_core_unlock(cpu, &flags);
>  
>  		cpumask_andnot(&sched_core_mask, &sched_core_mask, smt_mask);

Not specific to this patch, but perhaps we should do better here and
explicitly initialize more state...