linux-kernel - Re: [PATCH 5/6] cgroup/cpuset: optimize cpuset_mems_allowed

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Message-ID: <ZkOWRa_hFFhcbpVf@slm.duckdns.org>
Date: Tue, 14 May 2024 06:50:13 -1000
From: Tejun Heo <tj@...nel.org>
To: Waiman Long <longman@...hat.com>
Cc: Yury Norov <yury.norov@...il.com>, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Ben Segall <bsegall@...gle.com>,
	Daniel Bristot de Oliveira <bristot@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Frederic Weisbecker <frederic@...nel.org>,
	Imran Khan <imran.f.khan@...cle.com>,
	Ingo Molnar <mingo@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Leonardo Bras <leobras@...hat.com>, Mel Gorman <mgorman@...e.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...riel.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Zefan Li <lizefan.x@...edance.com>, cgroups@...r.kernel.org
Subject: Re: [PATCH 5/6] cgroup/cpuset: optimize
 cpuset_mems_allowed_intersects()

On Tue, May 14, 2024 at 12:47:59PM -0400, Waiman Long wrote:
> > diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> > index 4237c8748715..47ed206d4890 100644
> > --- a/kernel/cgroup/cpuset.c
> > +++ b/kernel/cgroup/cpuset.c
> > @@ -5010,6 +5010,9 @@ EXPORT_SYMBOL_GPL(cpuset_mem_spread_node);
> >   int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
> >   				   const struct task_struct *tsk2)
> >   {
> > +	if (tsk1 == tsk2)
> > +		return 1;
> > +
> >   	return nodes_intersects(tsk1->mems_allowed, tsk2->mems_allowed);
> >   }
> Reviewed-by: Waiman Long <longman@...hat.com>

I'm not sure this is worth the added code.

Thanks.

-- 
tejun