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From:   Xuewen Yan <xuewen.yan94@gmail.com>
Date:   Thu, 27 Apr 2023 19:50:44 +0800
Message-ID: <CAB8ipk9rFjgkyXu50a5CSkfNMuRi7GU_Tq8j++kxNLoy3pminA@mail.gmail.com>
Subject: Re: [PATCH 2/6] sched/cpuset: Bring back cpuset_mutex
To:     Juri Lelli <juri.lelli@redhat.com>
Cc:     Waiman Long <longman@redhat.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>,
        Qais Yousef <qyousef@layalina.io>, Tejun Heo <tj@kernel.org>,
        Zefan Li <lizefan.x@bytedance.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Hao Luo <haoluo@google.com>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        linux-kernel@vger.kernel.org, luca.abeni@santannapisa.it,
        claudio@evidence.eu.com, tommaso.cucinotta@santannapisa.it,
        bristot@redhat.com, mathieu.poirier@linaro.org,
        cgroups@vger.kernel.org,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Wei Wang <wvw@google.com>, Rick Yiu <rickyiu@google.com>,
        Quentin Perret <qperret@google.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        Sudeep Holla <sudeep.holla@arm.com>,
        =?UTF-8?B?546L56eRIChLZSBXYW5nKQ==?= <Ke.Wang@unisoc.com>,
        zhiguo.niu@uniissoc.com
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On Thu, Apr 27, 2023 at 1:53=E2=80=AFPM Juri Lelli <juri.lelli@redhat.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 t=
o
> have it there.
>
Dear Juri,

Thanks for the reply! We will test more in kernel5.15.

Thanks!
BR

> Thanks,
> Juri
>