From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758980Ab2DZTsE (ORCPT ); Thu, 26 Apr 2012 15:48:04 -0400 Received: from merlin.infradead.org ([205.233.59.134]:48768 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758898Ab2DZTsA (ORCPT ); Thu, 26 Apr 2012 15:48:00 -0400 Subject: Re: [PATCH RFC tip/core/rcu 6/6] rcu: Reduce cache-miss initialization latencies for large systems From: Peter Zijlstra To: paulmck@linux.vnet.ibm.com Cc: linux-kernel@vger.kernel.org, mingo@elte.hu, laijs@cn.fujitsu.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca, josh@joshtriplett.org, niv@us.ibm.com, tglx@linutronix.de, rostedt@goodmis.org, Valdis.Kletnieks@vt.edu, dhowells@redhat.com, eric.dumazet@gmail.com, darren@dvhart.com, fweisbec@gmail.com, patches@linaro.org In-Reply-To: <1335469319.2463.97.camel@laptop> References: <20120423164159.GA13819@linux.vnet.ibm.com> <1335199347-13926-1-git-send-email-paulmck@linux.vnet.ibm.com> <1335199347-13926-6-git-send-email-paulmck@linux.vnet.ibm.com> <1335444707.13683.14.camel@twins> <20120426141213.GB2407@linux.vnet.ibm.com> <1335454137.13683.95.camel@twins> <20120426161509.GE2407@linux.vnet.ibm.com> <1335469319.2463.97.camel@laptop> Content-Type: text/plain; charset="UTF-8" Date: Thu, 26 Apr 2012 21:47:44 +0200 Message-ID: <1335469664.2463.98.camel@laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.32.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2012-04-26 at 21:41 +0200, Peter Zijlstra wrote: > > I can very easily give you the size (nr cpus in) a node, still as long > as you iterate the cpu space linearly that's not going to be much > help. > Oh, I forgot, the numa masks etc are available, depending on CONFIG_NUMA, as cpumask_of_node(n).