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

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Message-ID: <1342808550.2583.48.camel@twins>
Date:	Fri, 20 Jul 2012 20:22:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	tglx@...utronix.de, linux-pm@...r.kernel.org
Subject: Re: [PATCHSET] workqueue: reimplement CPU hotplug to keep idle
 workers

On Fri, 2012-07-20 at 10:50 -0700, Tejun Heo wrote:
> Also, re-binding busy workers is easy.  The idle ones are difficult
> and we have to do that anyway for PM optimization.  What would be the
> benefit of not re-binding busy ones at the risk of continually
> transferring workers to another CPU given the right workload + CPU
> down/up patterns? 

I really think people who use hotplug at high frequencies are on drugs
and doing it wrong.


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