linux-kernel - Re: [PATCH] sched: Consider task_struct::saved_state in wait_task

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Message-ID: <Y/eaGdGD0sOAXWW+@linutronix.de>
Date:   Thu, 23 Feb 2023 17:53:45 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Mel Gorman <mgorman@...e.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Valentin Schneider <vschneid@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH] sched: Consider task_struct::saved_state in
 wait_task_inactive().

On 2023-02-22 14:36:14 [+0100], Peter Zijlstra wrote:
> Which if the very few wait_task_inactive() users requires this?

ptrace is the remaining (known) one (just verified on v6.2-rt3).
ptrace_check_attach() waits for the child which blocks on tasklist_lock.

tglx argued that wait_task_inactive() should work regardless of the
task, that is being waited for, blocks on a sleeping lock.

Sebastian