linux-kernel - Re: [RFC/PATCH] sched: Support moving kthreads into cpuset cgroups

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Message-ID: <aBuaN-xtOMs17ers@slm.duckdns.org>
Date: Wed, 7 May 2025 07:36:55 -1000
From: Tejun Heo <tj@...nel.org>
To: Xi Wang <xii@...gle.com>
Cc: Frederic Weisbecker <frederic@...nel.org>, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>,
	David Rientjes <rientjes@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Waiman Long <longman@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Koutný <mkoutny@...e.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Dan Carpenter <dan.carpenter@...aro.org>,
	Chen Yu <yu.c.chen@...el.com>, Kees Cook <kees@...nel.org>,
	Yu-Chun Lin <eleanor15x@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mickaël Salaün <mic@...ikod.net>,
	jiangshanlai@...il.com
Subject: Re: [RFC/PATCH] sched: Support moving kthreads into cpuset cgroups

Hello,

On Wed, May 07, 2025 at 10:23:24AM -0700, Xi Wang wrote:
> Overall I think your arguments depend on kernel and application threads are
> significantly different for cpu affinity management, but there isn't enough
> evidence for it. If cpuset is a bad idea for kernel threads it's probably not
> a good idea for user threads either. Maybe we should just remove cpuset from
> kernel and let applications threads go with boot time global variables and
> set their own cpu affinities.

I can't tell whether you're making a good faith argument. Even if you are,
you're making one bold claim without much substance and then jumping to the
other extreme based on that. This isn't a productive way to discuss these
things.

Thanks.

-- 
tejun