From: Yu Liao <liaoyu15@huawei.com>
To: <frederic@kernel.org>
Cc: <paulmck@kernel.org>, <linux-kernel@vger.kernel.org>,
<liwei391@huawei.com>
Subject: Re: Question about nohz and sysidle
Date: Mon, 14 Feb 2022 17:40:55 +0800 [thread overview]
Message-ID: <b6dc758b-492d-1000-24e5-643e38d3166e@huawei.com> (raw)
In-Reply-To: <b881759b-d281-fdc3-71b7-4429d84cd734@huawei.com>
Sorry, I sent to the old email address.
On 2022/2/14 16:28, Yu Liao wrote:
> Hi Frederic,
>
> I'm working on an issue about nohz. When NO_HZ_FULL is enabled, CPU 0
> handles the timekeeping duty on behalf of all other CPUs, which means
> CPU 0 never stop tick even in sysidle state. This is a powersaving issue.
>
> I found your patchset (nohz: Support sysidle) in the below link.
> https://lore.kernel.org/all/1406569056-30217-1-git-send-email-fweisbec@gmail.com/
>
> But these patches haven't been merged into mainline yet and sysidle
> state detection has been removed by commit fe5ac724d81a (rcu: Remove
> nohz_full full-system-idle state machine) as well.
>
> I tried your patches and it does work, why are we no longer
> working on stopping timekeeping duty when all full dynticks CPUs are idle?
>
> Thanks,
> Yu
next prev parent reply other threads:[~2022-02-14 9:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-14 8:28 Yu Liao
2022-02-14 9:40 ` Yu Liao [this message]
2022-02-14 10:57 ` Frederic Weisbecker
2022-02-14 14:49 ` Paul E. McKenney
2022-02-15 1:57 ` Xiongfeng Wang
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