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

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Message-ID: <YuG1vwqs1GgE/twg@worktop.programming.kicks-ass.net>
Date:   Thu, 28 Jul 2022 00:01:35 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Tejun Heo <tj@...nel.org>
Cc:     Qais Yousef <qais.yousef@....com>,
        Xuewen Yan <xuewen.yan@...soc.com>, rafael@...nel.org,
        viresh.kumar@...aro.org, mingo@...hat.com, 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,
        Waiman Long <longman@...hat.com>
Subject: Re: [PATCH] sched/schedutil: Fix deadlock between cpuset and cpu
 hotplug when using schedutil

On Tue, Jul 12, 2022 at 06:13:46AM -1000, Tejun Heo wrote:

> But now we're failing user-initiated operations randomly. I have a hard time
> seeing that as an acceptable solution. 

There (sadly) is precedent for that; grep for "cpu_hotplug_disable".