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Date:   Mon, 28 Jun 2021 16:13:00 +0200
From:   Frederic Weisbecker <frederic@kernel.org>
To:     "hasegawa-hitomi@fujitsu.com" <hasegawa-hitomi@fujitsu.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        "'mgorman@suse.de'" <mgorman@suse.de>,
        "'mingo@kernel.org'" <mingo@kernel.org>,
        "'tglx@linutronix.de'" <tglx@linutronix.de>,
        "'juri.lelli@redhat.com'" <juri.lelli@redhat.com>,
        "'vincent.guittot@linaro.org'" <vincent.guittot@linaro.org>,
        "'fweisbec@gmail.com'" <fweisbec@gmail.com>,
        "'dietmar.eggemann@arm.com'" <dietmar.eggemann@arm.com>,
        "'rostedt@goodmis.org'" <rostedt@goodmis.org>,
        "'bsegall@google.com'" <bsegall@google.com>,
        "'bristot@redhat.com'" <bristot@redhat.com>,
        "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Subject: Re: Utime and stime are less when getrusage (RUSAGE_THREAD) is
 executed on a tickless CPU.
Message-ID: <20210628141300.GA5710@lothringen>
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On Mon, Jun 28, 2021 at 02:36:27AM +0000, hasegawa-hitomi@fujitsu.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!