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Date:   Wed, 16 Dec 2020 11:10:12 +0100
From:   Thomas Gleixner <>
To:     Peter Zijlstra <>
Cc:     Steven Rostedt <>,
        Anna-Maria Behnsen <>,, Ingo Molnar <>,
        Juri Lelli <>,
        Vincent Guittot <>,
        Dietmar Eggemann <>,
        Ben Segall <>, Mel Gorman <>,
        Daniel Bristot de Oliveira <>
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.



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