linux-kernel - Re: [PATCH] sched/deadline: Fix server stopping with runnable tasks

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Message-ID: <9366bb54fa7529e79608b56a394d375789d28aa5.camel@redhat.com>
Date: Tue, 13 Jan 2026 10:42:02 +0100
From: Gabriele Monaco <gmonaco@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: juri.lelli@...hat.com, Ingo Molnar <mingo@...hat.com>, 
	linux-kernel@...r.kernel.org, williams@...hat.com
Subject: Re: [PATCH] sched/deadline: Fix server stopping with runnable tasks

On Tue, 2026-01-13 at 10:37 +0100, Peter Zijlstra wrote:
> >  static void update_curr_dl_se(struct rq *rq, struct sched_dl_entity *dl_se,
> > s64 delta_exec)
> >  {
> > -	bool idle = rq->curr == rq->idle;
> > +	bool idle = rq->curr == rq->idle && !rq->nr_running && !rq-
> > >ttwu_pending;
> 
> This is idle_cpu(), perhaps we can lift that thing into sched.h or so.
> 

Yeah, that's what I meant by quick and dirty.. I have idle_cpu() on the model
side (and have them matching simplifies a lot of things).

I just wasn't sure if we wanted a function call in there. But we can probably do
something nicer without it too.

Thanks,
Gabriele