Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758934AbYAKKrX (ORCPT ); Fri, 11 Jan 2008 05:47:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755458AbYAKKrQ (ORCPT ); Fri, 11 Jan 2008 05:47:16 -0500 Received: from mail1-relais-roc.national.inria.fr ([192.134.164.82]:44390 "EHLO mail1-relais-roc.national.inria.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753939AbYAKKrP (ORCPT ); Fri, 11 Jan 2008 05:47:15 -0500 X-Greylist: delayed 339 seconds by postgrey-1.27 at vger.kernel.org; Fri, 11 Jan 2008 05:47:14 EST X-IronPort-AV: E=Sophos;i="4.24,271,1196636400"; d="scan'208";a="6532234" Date: Fri, 11 Jan 2008 11:47:13 +0100 From: Guillaume Chazarain To: Ingo Molnar Cc: Jens Axboe , David Dillow , linux-kernel@vger.kernel.org, linux-btrace@vger.kernel.org, mingo@redhat.com, tglx@linutronix.de Subject: Re: [patch] block: fix blktrace timestamps Message-ID: <20080111114713.0a2df9ee@cheypa.inria.fr> In-Reply-To: <20080111102953.GA27223@elte.hu> References: <1199918912.8388.13.camel@lap75545.ornl.gov> <1199996752.9159.46.camel@lap75545.ornl.gov> <20080110234438.4826f658@inria.fr> <1200020661.5099.3.camel@obelisk.thedillows.org> <20080111090723.GI6258@kernel.dk> <20080111092334.GA8143@elte.hu> <20080111092513.GO6258@kernel.dk> <20080111094205.GE8143@elte.hu> <20080111095654.GR6258@kernel.dk> <20080111102953.GA27223@elte.hu> X-Mailer: Claws Mail 3.2.0 (GTK+ 2.12.3; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 613 Lines: 16 Ingo Molnar wrote: > Correction: it was not a high res time source, it was "the scheduler's > per-cpu, non-exported, non-coherent, warps-and-jumps-like-hell high-res > timesource that was intentionally called the _sched_ clock" ;-) I think the warts of cpu_clock() are fixable, except maybe unsynchronization on SMP which is harder. -- Guillaume -- 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/