linux-kernel - Re: [PATCH] sched/core: Fix the bug that sched_core

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Date:   Thu, 1 Sep 2022 11:02:10 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Cruz Zhao <CruzZhao@...ux.alibaba.com>
Cc:     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, vschneid@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/core: Fix the bug that sched_core_find() may
 return throttled task

On Wed, Aug 31, 2022 at 02:49:18PM +0800, Cruz Zhao wrote:
> When a cfs_rq is throttled, the cookie'd task in this cfs_rq wouldn't
> dequeue from the core tree, and sched_core_find() may return this task,
> which will result that the throttled task running on the cpu.
> 
> To resolve this problem, we pick the first cookie matched task and
> unthrottled task.

You mean: first that that both matches the cookie and is not throttled.

Except I think you can have the same problem with the RT crud.