Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763114AbXFASoo (ORCPT ); Fri, 1 Jun 2007 14:44:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761787AbXFASoi (ORCPT ); Fri, 1 Jun 2007 14:44:38 -0400 Received: from viefep18-int.chello.at ([213.46.255.22]:59196 "EHLO viefep19-int.chello.at" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1761617AbXFASoh (ORCPT ); Fri, 1 Jun 2007 14:44:37 -0400 Subject: Re: [PATCH 3/5] lockstat: core infrastructure From: Peter Zijlstra To: Daniel Walker Cc: Ingo Molnar , Steven Rostedt , linux-kernel@vger.kernel.org, Andrew Morton , Jason Baron , Thomas Gleixner In-Reply-To: <1180714263.15884.52.camel@imap.mvista.com> References: <20070529125248.877196281@chello.nl> <20070529130107.112347096@chello.nl> <1180470525.32594.71.camel@imap.mvista.com> <20070530132431.GA23947@elte.hu> <20070530134907.GA27085@elte.hu> <1180544796.32594.184.camel@imap.mvista.com> <1180545380.2958.1.camel@lappy> <1180545913.32594.194.camel@imap.mvista.com> <20070601131249.GA17059@elte.hu> <1180711606.15884.32.camel@imap.mvista.com> <1180713154.5676.4.camel@lappy> <1180714263.15884.52.camel@imap.mvista.com> Content-Type: text/plain Date: Fri, 01 Jun 2007 20:43:40 +0200 Message-Id: <1180723421.5676.8.camel@lappy> Mime-Version: 1.0 X-Mailer: Evolution 2.10.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 865 Lines: 22 On Fri, 2007-06-01 at 09:11 -0700, Daniel Walker wrote: > On Fri, 2007-06-01 at 17:52 +0200, Peter Zijlstra wrote: > > The whole issue is that you don't have any control over what clocksource > > you'll end up with. If it so happens that pmtimer gets selected your > > whole box will crawl if its used liberaly, like the patch under > > discussion does. > > You can have control over it, which I think the whole point of this > discussion .. No you don't, clocksource will gladly discard the TSC when its not found stable enough (the majority of the systems today). While it would be good enough for sched_clock(). - 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/