From: Peter Zijlstra <peterz@infradead.org>
To: Tejun Heo <tj@kernel.org>
Cc: Joel Fernandes <joelagnelf@nvidia.com>,
linux-kernel@vger.kernel.org, Andrea Righi <arighi@nvidia.com>,
Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
David Vernet <void@manifault.com>,
Changwoo Min <changwoo@igalia.com>,
Luigi De Matteis <ldematteis123@gmail.com>,
paulmck@kernel.org, boqun.feng@gmail.com
Subject: Re: [PATCH RFC 3/8] sched/ext: Add a DL server for sched_ext tasks
Date: Mon, 17 Mar 2025 18:06:02 +0100 [thread overview]
Message-ID: <20250317170602.GE6888@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <Z9hUby9e1JYaE6iC@slm.duckdns.org>
On Mon, Mar 17, 2025 at 06:57:19AM -1000, Tejun Heo wrote:
> Hello,
>
> On Mon, Mar 17, 2025 at 11:31:01AM +0100, Peter Zijlstra wrote:
> > On Sat, Mar 15, 2025 at 07:15:27PM -0400, Joel Fernandes wrote:
> > > If so, that will not handle the case where the system has both
> > > FAIR and EXT tasks in the mix (EXT has a partial mode where certain tasks can be
> > > made EXT with certain others left as FAIR) and FAIR runs 100% and starves EXT.
> >
> > Well, you did not mention that issue, you only babbled about RT.
> >
> > I did point out that issue with ext, and TJ said this mixed mode wasn't
> > really meant to be used or somesuch.
>
> It's true that most of the current use cases don't use mixed mode. That
> said, some folks are interested in it and if we can prevent starvation from
> fair saturating CPUs in mixed mode with a DL server, that'd be really nice.
> Would it be possible to toggle the reservations depending on the ext's
> operation mode?
Yeah, that should be doable.
next prev parent reply other threads:[~2025-03-17 17:06 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-15 2:21 [PATCH RFC 0/8] Add a deadline server for sched_ext tasks Joel Fernandes
2025-03-15 2:21 ` [PATCH RFC 1/8] sched: Add support to pick functions to take rf Joel Fernandes
2025-03-15 2:21 ` [PATCH RFC 2/8] sched: Add a server arg to dl_server_update_idle_time() Joel Fernandes
2025-03-15 2:21 ` [PATCH RFC 3/8] sched/ext: Add a DL server for sched_ext tasks Joel Fernandes
2025-03-15 7:22 ` Peter Zijlstra
2025-03-15 23:15 ` Joel Fernandes
2025-03-17 10:31 ` Peter Zijlstra
2025-03-17 16:57 ` Tejun Heo
2025-03-17 17:06 ` Peter Zijlstra [this message]
2025-03-17 21:48 ` Joel Fernandes
2025-03-17 22:16 ` Tejun Heo
2025-03-17 22:39 ` Joel Fernandes
2025-03-17 22:48 ` Tejun Heo
2025-03-18 10:07 ` Joel Fernandes
2025-03-17 21:53 ` Joel Fernandes
2025-03-15 17:56 ` Andrea Righi
2025-03-15 23:17 ` Joel Fernandes
2025-03-15 2:21 ` [PATCH RFC 4/8] sched/debug: Fix updating of ppos on server write ops Joel Fernandes
2025-03-15 2:21 ` [PATCH RFC 5/8] sched/debug: Stop and start server based on if it was active Joel Fernandes
2025-03-15 2:21 ` [PATCH RFC 6/8] sched/debug: Add support to change sched_ext server params Joel Fernandes
2025-03-15 2:21 ` [PATCH RFC 7/8] sched/deadline: Clear defer params Joel Fernandes
2025-03-15 2:21 ` [PATCH RFC 8/8] selftests/sched_ext: Add test for sched_ext dl_server Joel Fernandes
2025-03-15 23:22 ` Joel Fernandes
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