linux-kernel - Re: [PATCH v3 2/5] sched/deadline: Fix reclaim inaccuracy with SMP

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Date:   Fri, 26 May 2023 10:54:09 -0400
From:   Vineeth Remanan Pillai <vineeth@...byteword.org>
To:     luca abeni <luca.abeni@...tannapisa.it>
Cc:     Juri Lelli <juri.lelli@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Valentin Schneider <vschneid@...hat.com>,
        Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v3 2/5] sched/deadline: Fix reclaim inaccuracy with SMP

Hi Luca,

On Tue, May 23, 2023 at 10:11 PM Vineeth Remanan Pillai
<vineeth@...byteword.org> wrote:
>
> Hi Luca,
>
> [...]
>
> Will send it out tomorrow after a bit more testing.
>
Sorry for the delay. I was trying to fix the inaccuracy when normal
and SCHED_FLAG_RECLAIM tasks are present. Its a bit complicated than
I initially thought as Umax_reclaim and Uextra needs to be computed
at the root domain level and this would mean more locking. I have a
patch ready but I think I need to do more testing to understand the
performance implications and it is better to batch it as a separate
series.

So, I am just sending out the GRUB equation fix which is tested well
and I am confident about. Will send out rest of the fixes later as
a separate series.

Thanks,
Vineeth