linux-kernel - Re: [PATCHSET v6] sched: Implement BPF extensible scheduler class

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Date: Mon, 24 Jun 2024 15:01:01 -0700
From: Peter Oskolkov <posk@...gle.com>
To: Tejun Heo <tj@...nel.org>
Cc: Chris Mason <clm@...a.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Linus Torvalds <torvalds@...ux-foundation.org>, mingo@...hat.com, peterz@...radead.org, 
	juri.lelli@...hat.com, vincent.guittot@...aro.org, dietmar.eggemann@....com, 
	rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, bristot@...hat.com, 
	vschneid@...hat.com, ast@...nel.org, daniel@...earbox.net, andrii@...nel.org, 
	martin.lau@...nel.org, joshdon@...gle.com, brho@...gle.com, pjt@...gle.com, 
	derkling@...gle.com, haoluo@...gle.com, dvernet@...a.com, 
	dschatzberg@...a.com, dskarlat@...cmu.edu, riel@...riel.com, 
	changwoo@...lia.com, himadrics@...ia.fr, memxor@...il.com, 
	andrea.righi@...onical.com, joel@...lfernandes.org, 
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCHSET v6] sched: Implement BPF extensible scheduler class

On Mon, Jun 24, 2024 at 11:11 AM Tejun Heo <tj@...nel.org> wrote:
[...]
> > >     - How is this supposed to work with different applications requiring
> > >       different sched_ext schedulers?
[...]
> Long term, the tentative plan is to support a hierarchy of schedulers where
> the intermediate schedulers are responsible for granting CPUs to leaf
> schedulers which are responsible for scheduling tasks. Barret Rhoden has a
> framework called flux on top of ghost which already implements this albeit
> with compile time composition. Nothing is set in stone yet but it's likely
> that I'll follow what Barret is doing in many parts.
>
> Taking a step back, because sched_ext currently supports a single
> system-wide scheduler, many of the techniques that the current crop of
> schedulers are playing with are pretty generic, at least to a class of
> problems - e.g. gaming.

[...]

> So, the summary is that there are plans to support a tree of schedulers but
> we're currently mostly focusing on more generic single scheduler
> experiments.

[...]

Yes, as I've just mentioned in another message in this thread, we plan
to explore building UMCG-like per-process scheduling infra on top of
sched_ext once it is merged into the mainline kernel. This is not a
promise to actually do that (build such an infra); but rather a claim
that we believe it is possible to do that and that we plan to look
into the technical details once sched_ext is merged.