linux-kernel - Re: [PATCH] sched_ext: use msecs_to

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Date:   Sun, 11 Dec 2022 16:17:06 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Julia Lawall <julia.lawall@...ia.fr>
Cc:     torvalds@...ux-foundation.org, mingo@...hat.com,
        peterz@...radead.org, 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, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, martin.lau@...nel.org,
        joshdon@...gle.com, brho@...gle.com, pjt@...gle.com,
        derkling@...gle.com, haoluo@...gle.com, dvernet@...a.com,
        dschatzberg@...a.com, dskarlat@...cmu.edu, riel@...riel.com,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        kernel-team@...a.com
Subject: Re: [PATCH] sched_ext: use msecs_to_jiffies consistently

On Sun, Dec 11, 2022 at 11:43:30PM +0100, Julia Lawall wrote:
> The watchdog's timeout is processed by msecs_to_jiffies when it is
> checked, but not when the delay for running the watchdog is set.  The
> watchdog will thus run at a time that is later than that time at which it
> is checked that it has run, and the scheduler aborts.
> 
> Add the needed calls to msecs_to_jiffies.
> 
> Signed-off-by: Julia Lawall <julia.lawall@...ia.fr>
> 
> ---
> 
> Another solution would be to use jiffies everywhere.

Yeah, that was how David Vernet implemented it in the first place and I
insisted on using non-jiffies unit, which clearly seems like a mistake. I
think the right thing to do here is using jiffies for everything.

Thanks.

-- 
tejun