linux-kernel - Re: [PATCH] sched/schedutil: Fix deadlock between cpuset and cpu hotplug when using schedutil

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Message-ID: <20220711074724.tbwefl42fpf2aq5a@vireshk-i7>
Date:   Mon, 11 Jul 2022 13:17:24 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Xuewen Yan <xuewen.yan94@...il.com>
Cc:     Lukasz Luba <lukasz.luba@....com>,
        Xuewen Yan <xuewen.yan@...soc.com>, rafael@...nel.org,
        mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, linux-kernel@...r.kernel.org,
        ke.wang@...soc.com, xuewyan@...mail.com, linux-pm@...r.kernel.org
Subject: Re: [PATCH] sched/schedutil: Fix deadlock between cpuset and cpu
 hotplug when using schedutil

On 11-07-22, 15:43, Xuewen Yan wrote:
> This deadlock occurs when we run the monkey test on an Android phone,
> at the same time, randomly put online or offline a cpu core.
> Indeed the thread-A which get the cgroup_threadgroup_rwsem and waiting
> for the cpu_hotplug_lock is the thread whose name is "OomAdjuster" in
> android.

It would be better to reproduce this on mainline kernel, no android,
and tell us the steps. We don't want to chase an Android only issue,
just in case.

Thanks.

-- 
viresh