From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763463AbYEPTKh (ORCPT ); Fri, 16 May 2008 15:10:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758667AbYEPTKY (ORCPT ); Fri, 16 May 2008 15:10:24 -0400 Received: from mx1.redhat.com ([66.187.233.31]:50393 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758457AbYEPTKW (ORCPT ); Fri, 16 May 2008 15:10:22 -0400 Date: Fri, 16 May 2008 16:10:15 -0300 From: Arnaldo Carvalho de Melo To: Jesse Barnes Cc: Matthew Wilcox , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-rt-users@vger.kernel.org, Steven Rostedt Subject: Re: [PATCH][PCI]: Introduce pci_find_capability_cached and make MSI use it Message-ID: <20080516191015.GB8111@ghostprotocols.net> Mail-Followup-To: Arnaldo Carvalho de Melo , Jesse Barnes , Matthew Wilcox , linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-rt-users@vger.kernel.org, Steven Rostedt References: <20080515160426.GD14846@ghostprotocols.net> <200805161044.34938.jbarnes@virtuousgeek.org> <20080516183356.GA7307@ghostprotocols.net> <200805161201.48644.jbarnes@virtuousgeek.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200805161201.48644.jbarnes@virtuousgeek.org> X-Url: http://oops.ghostprotocols.net:81/blog User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Em Fri, May 16, 2008 at 12:01:48PM -0700, Jesse Barnes escreveu: > On Friday, May 16, 2008 11:33 am Arnaldo Carvalho de Melo wrote: > > > There are a few other common cap checks, but I don't think they compare > > > to MSI in terms of latency sensitivity (though I didn't audit all the > > > CAP_ID_EXP checks, there are quite a few of those). > > > > > > Since we know MSI is a problem, let's just go with fixing that for now. > > > If we find that other caps are also causing problems we can revisit > > > caching all of them; the patch is simple enough. > > > > Do you want me to submit another patch or can you cook up one? > > I can hack it up, probably not until Monday though (I'll be out of town this > weekend). OK, for now this patch should be in the next rt patchset, we'll drop it when you get The Right Thing merged 8) - Arnaldo