linux-kernel - Re: sched: Remove pointless preemption disable in sched_submit

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Date:   Tue, 28 Sep 2021 08:41:08 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>, Peter Oskolkov <posk@...k.io>,
        Tejun Heo <tj@...nel.org>
Subject: Re: sched: Remove pointless preemption disable in sched_submit_work()

On 9/28/21 8:30 AM, Thomas Gleixner wrote:
> Neither wq_worker_sleeping() nor io_wq_worker_sleeping() require to be invoked
> with preemption disabled:
> 
>   - The worker flag checks operations only need to be serialized against
>     the worker thread itself.
> 
>   - The accounting and worker pool operations are serialized with locks.
> 
> which means that disabling preemption has neither a reason nor a
> value. Remove it.

Reviewed-by: Jens Axboe <axboe@...nel.dk>

-- 
Jens Axboe