Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965062AbVJUSNO (ORCPT ); Fri, 21 Oct 2005 14:13:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965060AbVJUSNN (ORCPT ); Fri, 21 Oct 2005 14:13:13 -0400 Received: from 213-239-205-147.clients.your-server.de ([213.239.205.147]:10434 "EHLO mail.tglx.de") by vger.kernel.org with ESMTP id S965065AbVJUSNL (ORCPT ); Fri, 21 Oct 2005 14:13:11 -0400 Subject: Re: Ktimer / -rt9 (+custom) monotonic_clock going backwards. From: Thomas Gleixner Reply-To: tglx@linutronix.de To: john stultz Cc: Steven Rostedt , Ingo Molnar , linux-kernel@vger.kernel.org In-Reply-To: <1129918192.27168.218.camel@cog.beaverton.ibm.com> References: <20051020073416.GA28581@elte.hu> <20051020080107.GA31342@elte.hu> <20051020085955.GB2903@elte.hu> <1129826750.27168.163.camel@cog.beaverton.ibm.com> <20051020193214.GA21613@elte.hu> <1129918192.27168.218.camel@cog.beaverton.ibm.com> Content-Type: text/plain Organization: linutronix Date: Fri, 21 Oct 2005 20:15:42 +0200 Message-Id: <1129918542.15748.22.camel@tglx.tec.linutronix.de> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1117 Lines: 27 On Fri, 2005-10-21 at 11:09 -0700, john stultz wrote: > On Fri, 2005-10-21 at 02:03 -0400, Steven Rostedt wrote: > > With rc4-rt13 and changing cycle_t to u64, my machine ran all night > > without one backward step. Since it use to show up after a couple of > > hours, I would say that this is the fix. > > Great. I've committed that change to my tree already. > > > > John, Do you want me to take a crack at changing the periodic_hook into > > using the ktimer code? I understand Ingo's kernel much more than you, but > > you definitely understand the timing code better than I. > > If Thomas doesn't think its a good idea, then don't worry about it. I'd > be somewhat curious just how bad it is, but that can wait for now. We actually try to keep everything out of hard interrupt context what can be done elsewhere. Especially out of the timer interrupt. tglx - 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/