Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752999AbYKSVvM (ORCPT ); Wed, 19 Nov 2008 16:51:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750780AbYKSVu5 (ORCPT ); Wed, 19 Nov 2008 16:50:57 -0500 Received: from zrtps0kn.nortel.com ([47.140.192.55]:45989 "EHLO zrtps0kn.nortel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750747AbYKSVu4 (ORCPT ); Wed, 19 Nov 2008 16:50:56 -0500 Message-ID: <49248A35.4080401@nortel.com> Date: Wed, 19 Nov 2008 15:50:45 -0600 From: "Chris Friesen" User-Agent: Mozilla Thunderbird 1.0.2-6 (X11/20050513) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Peter Zijlstra CC: Ken Chen , Ingo Molnar , Linux Kernel Mailing List , Dhaval Giani Subject: Re: [patch] sched: add locking when update the task_group's cfs_rq[] array. References: <1227113662.29743.46.camel@lappy.programming.kicks-ass.net> <1227128331.29743.61.camel@lappy.programming.kicks-ass.net> In-Reply-To: <1227128331.29743.61.camel@lappy.programming.kicks-ass.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 19 Nov 2008 21:50:49.0089 (UTC) FILETIME=[E2669710:01C94A90] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 622 Lines: 15 Peter Zijlstra wrote: > Will it scale, half-way, I'd say. It races a little, but should > converge. The biggest issue is that we're running with 10 bit fixed > point math, and on large cpu machines you get into granularity problems. Is there any way to get higher resolution math on 64-bit machines? (I'm assuming that most larger SMP boxes will be 64-bit capable.) Chris -- 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/