linux-kernel - Re: [RFC][PATCH 2/3] sched: Add support to pick functions to take rf

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Message-ID: <aO00yNQozDw6N6jS@slm.duckdns.org>
Date: Mon, 13 Oct 2025 07:20:08 -1000
From: Tejun Heo <tj@...nel.org>
To: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>, linux-kernel@...r.kernel.org,
	mingo@...nel.org, juri.lelli@...hat.com, dietmar.eggemann@....com,
	rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
	vschneid@...hat.com, longman@...hat.com, hannes@...xchg.org,
	mkoutny@...e.com, void@...ifault.com, arighi@...dia.com,
	changwoo@...lia.com, cgroups@...r.kernel.org,
	sched-ext@...ts.linux.dev, liuwenfang@...or.com, tglx@...utronix.de,
	Joel Fernandes <joelagnelf@...dia.com>
Subject: Re: [RFC][PATCH 2/3] sched: Add support to pick functions to take rf

On Mon, Oct 13, 2025 at 03:06:33PM +0200, Vincent Guittot wrote:
...
> > And then we have next_active_class() skip fair_sched_class entirely when
> > scx_switch_all().
> 
> Ah yes you're right. fair is not called in case of scx_switched_all()

Yeah, when siwtch_all this isn't an issue at all. In partial mode, the extra
new idle may be noticeable but I don't think many people are using partial
mode, so we can worry about it when it becomes a problem.

Thanks.

-- 
tejun