linux-kernel - Re: [PATCHSET] workqueue: reimplement CPU hotplug to keep idle workers

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Message-ID: <20120720183400.GL32763@google.com>
Date:	Fri, 20 Jul 2012 11:34:00 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	tglx@...utronix.de, linux-pm@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [PATCHSET] workqueue: reimplement CPU hotplug to keep idle
 workers

Hello,

On Fri, Jul 20, 2012 at 08:22:30PM +0200, Peter Zijlstra wrote:
> I really think people who use hotplug at high frequencies are on drugs
> and doing it wrong.

I don't know.  It does make some sense.  It's not like we have any
other mechanism to keep some processors completely quiesient, which
could make a noticeable difference from powersaving POV compared to
mostly idle.  Rafael, can you please chime in and explain how / where
/ how freqeuntly / etc CPU hotplug is used for powersaving?

Thanks.

-- 
tejun
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