linux-kernel - Re: [PATCH v9 1/3] smpboot: allow excluding cpus from the smpboot threads

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Message-Id: <20150429152613.1c93dc1387eb4b7af4faa954@linux-foundation.org>
Date:	Wed, 29 Apr 2015 15:26:13 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Chris Metcalf <cmetcalf@...hip.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Don Zickus <dzickus@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Jones <drjones@...hat.com>,
	chai wen <chaiw.fnst@...fujitsu.com>,
	Ulrich Obergfell <uobergfe@...hat.com>,
	Fabian Frederick <fabf@...net.be>,
	Aaron Tomlin <atomlin@...hat.com>,
	Ben Zhang <benzh@...omium.org>,
	"Christoph Lameter" <cl@...ux.com>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	<linux-kernel@...r.kernel.org>, "Jonathan Corbet" <corbet@....net>,
	<linux-doc@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v9 1/3] smpboot: allow excluding cpus from the smpboot
 threads

On Fri, 17 Apr 2015 14:37:16 -0400 Chris Metcalf <cmetcalf@...hip.com> wrote:

> This change allows some cores to be excluded from running the
> smp_hotplug_thread tasks.  The following commit to update
> kernel/watchdog.c to use this functionality is the motivating
> example, and more information on the motivation is provided there.
> 
> A new smp_hotplug_thread field is introduced, "cpumask", which
> is cpumask field managed by the smpboot subsystem that indicates whether
> or not the given smp_hotplug_thread should run on that core; the
> cpumask is checked when deciding whether to unpark the thread.
> 
> To limit the cpumask to less than cpu_possible, you must call
> smpboot_update_cpumask_percpu_thread() after registering.

Has Thomas commented on any version of this?   t'would be nice.
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