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

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Message-ID: <1cca28c3-c84d-415e-9b33-6687e4ff2cbb@linux.alibaba.com>
Date:   Fri, 14 Jan 2022 19:13:12 +0800
From:   cruzzhao <cruzzhao@...ux.alibaba.com>
To:     Tejun Heo <tj@...nel.org>
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



在 2022/1/13 上午4:42, Tejun Heo 写道:
> 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.
> 

Thanks for suggestions, I'll try to do this using rstat. BTW, is it ok
to integrate it with cgroup_base_stat?

Best,
Cruz Zhao