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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Waiman Long <longman@redhat.com>
Cc: Frederic Weisbecker <frederic@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Anna-Maria Behnsen <anna-maria@linutronix.de>,
	Gabriele Monaco <gmonaco@redhat.com>,
	Ingo Molnar <mingo@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	Marco Crivellari <marco.crivellari@suse.com>,
	Michal Hocko <mhocko@kernel.org>,
	"Paul E . McKenney" <paulmck@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>, Phil Auld <pauld@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Valentin Schneider <vschneid@redhat.com>,
	Vlastimil Babka <vbabka@suse.cz>, linux-doc@vger.kernel.org
Subject: Re: [PATCH] doc: Add CPU Isolation documentation
Message-ID: <20260324164005.eBNX2ppQ@linutronix.de>
References: <20250809094247.8384-1-frederic@kernel.org>
 <20260324153823.VKwebBuG@linutronix.de>
 <579827ac-a933-45ec-b396-01656c30c9e4@redhat.com>
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On 2026-03-24 12:00:17 [-0400], Waiman Long wrote:
> > while looking at this again, shouldn't you also do
> > 	echo 7 > cpuset.cpus.exclusive
> > 
> > to ensure the CPU isn't used somewhere else?
> 
> For backport compatibility, the use of cpuset.cpus.exclusive is optional for
> creating a local partition underneath the cgroup root. The example should
> still work without setting cpuset.cpus.exclusive.

I would have to double check but I think only after the
cpuset.cpus.exclusive the CPU vanished from the cpumask of my current
task.

> Cheers,
> Longman

Sebastian