linux-kernel - Re: Utime and stime are less when getrusage (RUSAGE

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Message-ID: <20210628141300.GA5710@lothringen>
Date:   Mon, 28 Jun 2021 16:13:00 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "hasegawa-hitomi@...itsu.com" <hasegawa-hitomi@...itsu.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        "'mgorman@...e.de'" <mgorman@...e.de>,
        "'mingo@...nel.org'" <mingo@...nel.org>,
        "'tglx@...utronix.de'" <tglx@...utronix.de>,
        "'juri.lelli@...hat.com'" <juri.lelli@...hat.com>,
        "'vincent.guittot@...aro.org'" <vincent.guittot@...aro.org>,
        "'fweisbec@...il.com'" <fweisbec@...il.com>,
        "'dietmar.eggemann@....com'" <dietmar.eggemann@....com>,
        "'rostedt@...dmis.org'" <rostedt@...dmis.org>,
        "'bsegall@...gle.com'" <bsegall@...gle.com>,
        "'bristot@...hat.com'" <bristot@...hat.com>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: Re: Utime and stime are less when getrusage (RUSAGE_THREAD) is
 executed on a tickless CPU.

On Mon, Jun 28, 2021 at 02:36:27AM +0000, hasegawa-hitomi@...itsu.com wrote:
> Hi Frederic, Peter, and Mel
> 
> > I tested this and confirmed that it gives accurate values.
> > Also, task_sched_runtime () is done only on nohz_full CPU, so I think
> > it's a better idea than before.
> > I hope you will incorporate this fix into your mainline.
> 
> I have also confirmed that CPUs other than nohz_full have very little overhead.
> Please consider merging it into the mainline.

Ok, I'm going to submit a proper patch.

Thanks!