Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754044AbXE3Nls (ORCPT ); Wed, 30 May 2007 09:41:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752122AbXE3Nll (ORCPT ); Wed, 30 May 2007 09:41:41 -0400 Received: from ms-smtp-05.nyroc.rr.com ([24.24.2.59]:57499 "EHLO ms-smtp-05.nyroc.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751655AbXE3Nlk (ORCPT ); Wed, 30 May 2007 09:41:40 -0400 Date: Wed, 30 May 2007 09:40:28 -0400 (EDT) From: Steven Rostedt X-X-Sender: rostedt@gandalf.stny.rr.com To: Ingo Molnar cc: Daniel Walker , Peter Zijlstra , linux-kernel@vger.kernel.org, Andrew Morton , Bill Huey , Jason Baron , Christoph Hellwig Subject: Re: [PATCH 3/5] lockstat: core infrastructure In-Reply-To: <20070530132431.GA23947@elte.hu> Message-ID: References: <20070529125248.877196281@chello.nl> <20070529130107.112347096@chello.nl> <1180470525.32594.71.camel@imap.mvista.com> <20070530132431.GA23947@elte.hu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1113 Lines: 27 > > > [...] Most architecture implement a jiffies sched_clock() w/ 1 > > millisecond or worse resolution.. [...] > > weird that you count importance by 'number of architectures', while 98% > of the installed server base is x86 or x86_64, where sched_clock() is > pretty precise ;-) > I can understand Daniel's POV (from working at TimeSys once upon a time). He works for Monta Vista which does a lot with embedded systems running on something other than x86. So from Daniel's POV, those "number of architectures" is of importance. While, from those that do server work where x86 is now becoming the dominant platform, our focus is on those. As long as the work doesn't "break" an arch. We can argue that sched_clock is "good enough". If someone wants better accounting of locks on some other arch, they can simply change sched_clock to be more precise. -- Steve - 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/