linux-kernel - Re: [tip: sched/core] sched/rt: Make rt_rq->pushable_tasks updates drive rto

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Message-ID: <ZRXuZmjU2tP8ETP5@gmail.com>
Date:   Thu, 28 Sep 2023 23:21:42 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Valentin Schneider <vschneid@...hat.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        x86@...nel.org
Subject: Re: [tip: sched/core] sched/rt: Make rt_rq->pushable_tasks updates
 drive rto_mask


* Valentin Schneider <vschneid@...hat.com> wrote:

> > sched/deadline.c has something very similar, does that need updating 
> > too?
> 
> Hm I think so yes:
> - push_dl_task() is an obvious noop if the pushable tree is empty
> - pull_dl_task() can be kicked if !rq->dl.overloaded, which similarly to rt
>   is driven by nr_migratory but could be boiled down to having pushable
>   tasks (due to the nr_cpus_allowed > 1 constraint).
> 
> Lemme poke at it.

For reference, the matching DL change now lives in tip:sched/core as:

   177f608a4c82 ("sched/deadline: Make dl_rq->pushable_dl_tasks update drive dl_rq->overloaded")

Thanks,

	Ingo