linux-kernel - Re: [PATCH] [RFC] rt: kernel/sched/core: fix kthread_park() pending too long when CPU un-plugged

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Message-ID: <20210108111948.g7szdc3b46hffz24@linutronix.de>
Date:   Fri, 8 Jan 2021 12:19:48 +0100
From:   Sebastian Siewior <bigeasy@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ran Wang <ran.wang_1@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jiafei Pan <jiafei.pan@....com>,
        linux-rt-users@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC] rt: kernel/sched/core: fix kthread_park() pending
 too long when CPU un-plugged

On 2021-01-08 10:32:36 [+0100], Peter Zijlstra wrote:
> It's a single task wakeup (the caller), doing that from hardirq context
> really should not be a problem, we do lots of that in RT already.

I'm not worry about that single wakeup but about an artificial case
where you manage to accumulate multiple single wake ups in a short
time frame.

Sebastian