From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754282AbYECThl (ORCPT ); Sat, 3 May 2008 15:37:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752751AbYECThU (ORCPT ); Sat, 3 May 2008 15:37:20 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:60143 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752643AbYECThT (ORCPT ); Sat, 3 May 2008 15:37:19 -0400 Date: Sat, 3 May 2008 21:37:01 +0200 From: Ingo Molnar To: David Miller Cc: a.p.zijlstra@chello.nl, efault@gmx.de, elendil@planet.nl, parag.warudkar@gmail.com, linux-kernel@vger.kernel.org, guichaz@yahoo.fr, andi@firstfloor.org Subject: Re: 'global' rq->clock Message-ID: <20080503193701.GA25097@elte.hu> References: <20080503082849.GA29605@elte.hu> <20080503.020502.226847930.davem@davemloft.net> <20080503101016.GA18801@elte.hu> <20080503.122734.01023096.davem@davemloft.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080503.122734.01023096.davem@davemloft.net> User-Agent: Mutt/1.5.17 (2007-11-01) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * David Miller wrote: > From: Ingo Molnar > Date: Sat, 3 May 2008 12:10:16 +0200 > > > ( although please note that the growing generalization that goes on > > _did_ find a subtle nohz problem on sparc64 early in the merge > > window, so it's not like these changes are totally useless to you. > > ) > > Note that this bug theoretically exists on every platform, even x86, > and only sparc64 is fixed at the moment by adding the > irq_{entry,exit}() guards around all of it's IPI handlers. > > Just a reminder. yeah, indeed - it's masked on x86 by the suckiness of most clockevents hw timers. We dont get unlimited sleep time like sparc64 does :-/ Ingo