Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755304Ab2FFIn7 (ORCPT ); Wed, 6 Jun 2012 04:43:59 -0400 Received: from merlin.infradead.org ([205.233.59.134]:48955 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753415Ab2FFIn5 convert rfc822-to-8bit (ORCPT ); Wed, 6 Jun 2012 04:43:57 -0400 Message-ID: <1338972223.2749.79.camel@twins> Subject: Re: [PATCH 0/6] x86/cpu hotplug: Wake up offline CPU via mwait or nmi From: Peter Zijlstra To: paulmck@linux.vnet.ibm.com Cc: Thomas Gleixner , "Luck, Tony" , "Yu, Fenghua" , Rusty Russell , Ingo Molnar , H Peter Anvin , "Siddha, Suresh B" , "Mallick, Asit K" , Arjan Dan De Ven , linux-kernel , x86 , linux-pm , "Srivatsa S. Bhat" Date: Wed, 06 Jun 2012 10:43:43 +0200 In-Reply-To: <20120605221240.GW2388@linux.vnet.ibm.com> References: <3E5A0FA7E9CA944F9D5414FEC6C7122007727023@ORSMSX105.amr.corp.intel.com> <1338912565.2749.9.camel@twins> <3E5A0FA7E9CA944F9D5414FEC6C7122007728081@ORSMSX105.amr.corp.intel.com> <1338913190.2749.10.camel@twins> <3908561D78D1C84285E8C5FCA982C28F19300965@ORSMSX104.amr.corp.intel.com> <1338918625.2749.29.camel@twins> <1338925756.2749.36.camel@twins> <1338931856.2749.57.camel@twins> <20120605221240.GW2388@linux.vnet.ibm.com> Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Mailer: Evolution 3.2.2- Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 824 Lines: 16 On Tue, 2012-06-05 at 15:12 -0700, Paul E. McKenney wrote: > > What I can't see is the isolated functional, aside from the above > > mentioned things, that's not strictly a per-cpu property, we can have a > > group that's isolated from the rest but not from each other. > > I suspect that Thomas is thinking that the CPU is so idle that it no > longer has to participate in TLB invalidation or RCU. (Thomas will > correct me if I am confused.) But Peter, is that the level of idle > you are thinking of? No, we're talking about isolated, so its very much running something. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/