From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760862AbYHAWxh (ORCPT ); Fri, 1 Aug 2008 18:53:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759087AbYHAWxF (ORCPT ); Fri, 1 Aug 2008 18:53:05 -0400 Received: from out01.mta.xmission.com ([166.70.13.231]:47487 "EHLO out01.mta.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759441AbYHAWxE (ORCPT ); Fri, 1 Aug 2008 18:53:04 -0400 From: ebiederm@xmission.com (Eric W. Biederman) To: "Yinghai Lu" Cc: "Ingo Molnar" , "Thomas Gleixner" , hpa , "Dhaval Giani" , "Mike Travis" , "Andrew Morton" , linux-kernel@vger.kernel.org References: <1217583464-28494-1-git-send-email-yhlu.kernel@gmail.com> <86802c440808011430i6cf5cb8cn519777a78dd987b0@mail.gmail.com> <86802c440808011457g5b72d69bq768cf815046957ec@mail.gmail.com> Date: Fri, 01 Aug 2008 15:45:23 -0700 In-Reply-To: <86802c440808011457g5b72d69bq768cf815046957ec@mail.gmail.com> (Yinghai Lu's message of "Fri, 1 Aug 2008 14:57:13 -0700") Message-ID: User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-SA-Exim-Connect-IP: 24.130.11.59 X-SA-Exim-Mail-From: ebiederm@xmission.com X-Spam-DCC: XMission; sa01 1397; Body=1 Fuz1=1 Fuz2=1 X-Spam-Combo: **;"Yinghai Lu" X-Spam-Relay-Country: X-Spam-Report: * 7.0 XM_URI_RBL URI's domain appears in surbl.xmission.com * [URIs: lkml.org] * -1.8 ALL_TRUSTED Passed through trusted hosts only via SMTP * 0.0 T_TM2_M_HEADER_IN_MSG BODY: T_TM2_M_HEADER_IN_MSG * -2.6 BAYES_00 BODY: Bayesian spam probability is 0 to 1% * [score: 0.0000] * -0.0 DCC_CHECK_NEGATIVE Not listed in DCC * [sa01 1397; Body=1 Fuz1=1 Fuz2=1] * 0.0 XM_SPF_Neutral SPF-Neutral Subject: Re: [PATCH 00/16] dyn_array and nr_irqs support v2 X-SA-Exim-Version: 4.2 (built Thu, 03 Mar 2005 10:44:12 +0100) X-SA-Exim-Scanned: Yes (on mgr1.xmission.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org "Yinghai Lu" writes: > On Fri, Aug 1, 2008 at 2:30 PM, Yinghai Lu wrote: >> On Fri, Aug 1, 2008 at 1:46 PM, Eric W. Biederman > wrote: > >>> http://lkml.org/lkml/2008/7/10/439 > > you moved kstat_irqs to irqdesc, and it will not numa-aware. if > irq_desc is not go with every cpu. That part is a limitation of the per cpu allocator that the sgi guys are in the process of fixing. Which is one of the following goals of folding the pda into a per cpu structure. In practice it matters little as irqs only occur on one cpu at a time, so we shouldn't have cache line contention. I never got to the arch specific part of allocating irq_desc in a numa aware fashion. But I have always figured that if we move the work to arch code it won't be too difficult, to do things appropriately. Eric