linux-kernel - Re: [PATCH v2] sched/deadline: Reset dl

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Message-ID: <aXzTxh2jgcGf3JdD@jlelli-thinkpadt14gen4.remote.csb>
Date: Fri, 30 Jan 2026 16:52:38 +0100
From: Juri Lelli <juri.lelli@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Andrea Righi <arighi@...dia.com>, Gabriele Monaco <gmonaco@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>, Tejun Heo <tj@...nel.org>,
	Joel Fernandes <joelagnelf@...dia.com>,
	David Vernet <void@...ifault.com>,
	Changwoo Min <changwoo@...lia.com>,
	Daniel Hodges <hodgesd@...a.com>, sched-ext@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sched/deadline: Reset dl_server execution state on
 stop

On 30/01/26 13:41, Peter Zijlstra wrote:
> On Fri, Jan 30, 2026 at 01:26:20PM +0100, Peter Zijlstra wrote:
> > On Fri, Jan 30, 2026 at 01:24:13PM +0100, Peter Zijlstra wrote:
> > > On Wed, Jan 28, 2026 at 02:41:40PM +0100, Andrea Righi wrote:
> > > 
> > > > Just to make sure we're testing the same thing, I'm currently using
> > > > https://git.kernel.org/pub/scm/linux/kernel/git/arighi/linux.git, branch
> > > > scx-dl-server.
> > > > 
> > > > I'm running this test inside virtme-ng:
> > > >   $ vng -vb --config tools/testing/selftests/sched_ext/config
> > > >   $ vng -v -- tools/testing/selftests/sched_ext/runner -t rt_stall
> > > 
> > > Apparently you also have to actually have that runner thing built from
> > > that tree.
> > > 
> > > Anyway, all I seem to be able to get (on x86) is PASS: 1 :/
> > 
> > Argh, that tree has the dodgy 'fix' in. Let me go revert that.
> 
> This seems to work?

Makes sense to me. Also handles nicely the CBS wakeup rule.

Thanks,
Juri