Re: [PATCH] sched/core: Fix the bug that sched_core_find() may return throttled task

From: Peter Zijlstra
Date: Thu Sep 01 2022 - 05:03:56 EST


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.