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Message-ID: <CAB8ipk9rFjgkyXu50a5CSkfNMuRi7GU_Tq8j++kxNLoy3pminA@mail.gmail.com>
Date: Thu, 27 Apr 2023 19:50:44 +0800
From: Xuewen Yan <xuewen.yan94@...il.com>
To: Juri Lelli <juri.lelli@...hat.com>
Cc: Waiman Long <longman@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>,
Qais Yousef <qyousef@...alina.io>, Tejun Heo <tj@...nel.org>,
Zefan Li <lizefan.x@...edance.com>,
Johannes Weiner <hannes@...xchg.org>,
Hao Luo <haoluo@...gle.com>,
Dietmar Eggemann <dietmar.eggemann@....com>,
Steven Rostedt <rostedt@...dmis.org>,
linux-kernel@...r.kernel.org, luca.abeni@...tannapisa.it,
claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it,
bristot@...hat.com, mathieu.poirier@...aro.org,
cgroups@...r.kernel.org,
Vincent Guittot <vincent.guittot@...aro.org>,
Wei Wang <wvw@...gle.com>, Rick Yiu <rickyiu@...gle.com>,
Quentin Perret <qperret@...gle.com>,
Heiko Carstens <hca@...ux.ibm.com>,
Vasily Gorbik <gor@...ux.ibm.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>,
Sudeep Holla <sudeep.holla@....com>,
王科 (Ke Wang) <Ke.Wang@...soc.com>,
zhiguo.niu@...issoc.com
Subject: Re: [PATCH 2/6] sched/cpuset: Bring back cpuset_mutex
On Thu, Apr 27, 2023 at 1:53 PM Juri Lelli <juri.lelli@...hat.com> wrote:
>
> Hi,
>
> On 27/04/23 10:58, Xuewen Yan wrote:
> > HI Juri,
> >
> > Would this patch be merged tobe stable-rc? In kernel5.15, we also find
> > that the rwsem would be blocked for a long time, when we change the
> > task's cpuset cgroup.
> > And when we revert to the mutex, the delay would disappear.
>
> Honestly, I'm not sure. This change is mostly improving performance, but
> it is also true that it's fixing some priority inheritance corner cases.
> So, I'm not sure it qualifies for stable, but it would be probably good to
> have it there.
>
Dear Juri,
Thanks for the reply! We will test more in kernel5.15.
Thanks!
BR
> Thanks,
> Juri
>
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