linux-kernel - Re: [PATCH 1/3] sched/isolation: Add HK_FLAG_SCHED to nohz

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Message-ID: <20240904140210.GK4723@noisy.programming.kicks-ass.net>
Date: Wed, 4 Sep 2024 16:02:10 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Phil Auld <pauld@...hat.com>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Waiman Long <longman@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	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>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] sched/isolation: Add HK_FLAG_SCHED to nohz_full

On Wed, Sep 04, 2024 at 09:44:27AM -0400, Phil Auld wrote:

> > You can create single CPU partitions using cpusets dynamically.
> >
> 
> This is somewhat new though...   Although you could turn off load balancing with
> groups v1, in v2 you could not. 

I can't remember, but I think I stalled cpuset-v2 until this was
adressed -- that is, AFAIR any v2 can actually do this too. You create
many 1 cpu partitions. It is more cumbersome that v1, but it is very
much doable.