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

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Message-ID: <20240904143207.GB136544@pauld.westford.csb>
Date: Wed, 4 Sep 2024 10:32:07 -0400
From: Phil Auld <pauld@...hat.com>
To: Peter Zijlstra <peterz@...radead.org>
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 04:02:10PM +0200 Peter Zijlstra wrote:
> 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.
> 
> 

v2 can do this _now_. It couldn't before. Or at least not in a way that was
usable until Waiman's partitioning patches I believe.

I did say that in the past tense :)



Cheers,
Phil

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