From: Tejun Heo <tj@kernel.org>
To: Peter Zijlstra <peterz@infradead.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 06:57:19 -1000 [thread overview]
Message-ID: <Z9hUby9e1JYaE6iC@slm.duckdns.org> (raw)
In-Reply-To: <20250317103101.GC34541@noisy.programming.kicks-ass.net>
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?
Thanks.
--
tejun
next prev parent reply other threads:[~2025-03-17 16:57 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 " 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 [this message]
2025-03-17 17:06 ` Peter Zijlstra
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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