linux-kernel - Re: [PATCH v2 3/3] sched/core: Force idle accounting per cgroup

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Date:   Wed, 12 Jan 2022 10:42:22 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Cruz Zhao <CruzZhao@...ux.alibaba.com>
Cc:     lizefan.x@...edance.com, hannes@...xchg.org, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, joshdon@...gle.com, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] sched/core: Force idle accounting per cgroup

Hello,

On Tue, Jan 11, 2022 at 05:56:01PM +0800, Cruz Zhao wrote:
> +#ifdef CONFIG_SCHED_CORE
> +void cpuacct_account_forceidle(int cpu, struct task_struct *tsk, u64 cputime)
> +{
> +	struct cpuacct *ca;
> +	u64 *fi;
> +
> +	rcu_read_lock();
> +	/*
> +	 * We have hold rq->core->__lock here, which protects ca->forceidle
> +	 * percpu.
> +	 */
> +	for (ca = task_ca(tsk); ca; ca = parent_ca(ca)) {
> +		fi = per_cpu_ptr(ca->forceidle, cpu);
> +		*fi += cputime;
> +	}

Please don't do this. Use rstat and integrate it with other stats.

Thanks.

-- 
tejun