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

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Message-ID: <1338912565.2749.9.camel@twins>
Date:	Tue, 05 Jun 2012 18:09:25 +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 16:02 +0000, Yu, Fenghua wrote:
> 
> Users can consolidate processes on a few online CPU's and offline the
> rest when workload is light. 

No they can't, hotplug is a root only op.

> This consolidation can save more power and have better performance
> than idling CPU's because hot cache in online CPU's and offline CPU's
> can be allocated in same package. 

Yeah, or you fix the load-balancer to do this.
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