linux-kernel - Re: [PATCH] sched: Prevent raising SCHED

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Message-ID: <87zh2erri3.fsf@nanos.tec.linutronix.de>
Date:   Wed, 16 Dec 2020 11:10:12 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Anna-Maria Behnsen <anna-maria@...utronix.de>,
        linux-kernel@...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>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: Re: [PATCH] sched: Prevent raising SCHED_SOFTIRQ when CPU is !active

On Wed, Dec 16 2020 at 09:19, Peter Zijlstra wrote:
> On Tue, Dec 15, 2020 at 06:52:49PM +0100, Thomas Gleixner wrote:
>> I might be missing something, but how is the CPU which runs the pinned
>> kernel thread, i.e. the hotplug thread, supposed to go idle between the
>> two calls?
>
> Take a mutex or something other daft. My disabling preemption around it
> we basically assert the two functions are non-blocking and none of that
> cruft matters.

That'd be really daft, but yes we can do that for paranoia sake.

Thanks,

        tglx