linux-kernel - Re: [PATCH v5 1/2] sched/rt: fix bad task migration for rt tasks

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Date:   Tue, 12 Jul 2022 22:37:05 +0800
From:   Schspa Shi <schspa@...il.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com,
        vschneid@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/2] sched/rt: fix bad task migration for rt tasks


Steven Rostedt <rostedt@...dmis.org> writes:

> On Tue, 12 Jul 2022 09:31:24 +0800
> Schspa Shi <schspa@...il.com> wrote:
>
>> @@ -1998,11 +1998,15 @@ static struct rq *find_lock_lowest_rq(struct task_struct *task, struct rq *rq)
>>  			 * the mean time, task could have
>>  			 * migrated already or had its affinity changed.
>>  			 * Also make sure that it wasn't scheduled on its rq.
>> +			 * It is possible the task was scheduled, set
>> +			 * "migrate_disabled" and then got preempted, And we
>> +			 * check task migration disable flag here too.
>
> Nit.  "got preempted, so we must check the task migration disable flag here
> too".
>

OK, I will make a upload for this too.

> But other than that.
>
> Reviewed-by: Steven Rostedt (Google) <rostedt@...dmis.org>
>
> -- Steve
>
>>  			 */


-- 
BRs
Schspa Shi