linux-kernel - RE: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi

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Message-ID: <1338913190.2749.10.camel@twins>
Date:	Tue, 05 Jun 2012 18:19:50 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Yu, Fenghua" <fenghua.yu@...el.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, H Peter Anvin <hpa@...or.com>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	Arjan Dan De Ven <arjan@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	x86 <x86@...nel.org>, linux-pm <linux-pm@...r.kernel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Subject: RE: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or
 nmi

On Tue, 2012-06-05 at 16:18 +0000, Yu, Fenghua wrote:
> Actually some Linux people are adjusting online/offline CPU's based on
> workload to save power in their business. There are some advantages
> for online/offline CPU's than idling CPU's.

Like what? Offline is nothing more than a C state on x86. 
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