linux-kernel - Re: [PATCH 10/24] sched/uclamg: Handle delayed dequeue

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Message-ID: <a2c60338c82fa77e82def64c95134df9b8a5626e.camel@gmx.de>
Date: Wed, 25 Sep 2024 07:14:39 +0200
From: Mike Galbraith <efault@....de>
To: Luis Machado <luis.machado@....com>, Peter Zijlstra
 <peterz@...radead.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>, Vincent Guittot
 <vincent.guittot@...aro.org>, Hongyan Xia <hongyan.xia2@....com>, 
 mingo@...hat.com, juri.lelli@...hat.com, rostedt@...dmis.org,
 bsegall@...gle.com,  mgorman@...e.de, vschneid@...hat.com,
 linux-kernel@...r.kernel.org,  kprateek.nayak@....com,
 wuyun.abel@...edance.com, youssefesmat@...omium.org,  tglx@...utronix.de
Subject: Re: [PATCH 10/24] sched/uclamg: Handle delayed dequeue

On Tue, 2024-09-24 at 19:35 +0200, Mike Galbraith wrote:
> On Tue, 2024-09-24 at 16:16 +0100, Luis Machado wrote:
> > On 9/14/24 04:40, Mike Galbraith wrote:
> > > On Fri, 2024-09-13 at 18:39 +0200, Mike Galbraith wrote:
> > > > tip 4c293d0fa315 (sans sched/eevdf: More PELT vs DELAYED_DEQUEUE)
> > > > seems
> > > > to be stable.
> > >
> > > Belay that, it went boom immediately this morning while trying to
> > > trigger a warning I met elsewhere.
> > >
> > >         -Mike
> >
> > Are you still hitting this one?
> >
> > I was trying to reproduce this one on the Pixel 6 (manifests as
> > a boot crash) but couldn't so far. Something might've changed a bit.
>
> I'm also having no luck triggering it.

BTW, that includes hefty RT/!RT config beating sessions w/wo..

   sched/eevdf: More PELT vs DELAYED_DEQUEUE

..and w/wo your mod to same, with dequeue on unthrottle patchlet to
keep sched_delayed encounter there from interrupting the hunt.

	-Mike