From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751769AbVJTGUR (ORCPT ); Thu, 20 Oct 2005 02:20:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751772AbVJTGUQ (ORCPT ); Thu, 20 Oct 2005 02:20:16 -0400 Received: from ms-smtp-03.nyroc.rr.com ([24.24.2.57]:24248 "EHLO ms-smtp-03.nyroc.rr.com") by vger.kernel.org with ESMTP id S1751769AbVJTGUP (ORCPT ); Thu, 20 Oct 2005 02:20:15 -0400 Date: Thu, 20 Oct 2005 02:19:41 -0400 (EDT) From: Steven Rostedt X-X-Sender: rostedt@localhost.localdomain To: Thomas Gleixner cc: john stultz , Ingo Molnar , linux-kernel@vger.kernel.org Subject: Re: Ktimer / -rt9 (+custom) monotonic_clock going backwards. In-Reply-To: <1129734626.19559.275.camel@tglx.tec.linutronix.de> Message-ID: References: <1129734626.19559.275.camel@tglx.tec.linutronix.de> 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 On Wed, 19 Oct 2005, Thomas Gleixner wrote: > On Wed, 2005-10-19 at 10:59 -0400, Steven Rostedt wrote: > > The ktimer code itself calls the timeofday code, which provides the > monotonic clock. I have no idea what might go wrong. > > Is this reproducible ? > Right now I'm compiling for the -rt kernel without my updates, to see if it is reproducible there. It is reproducible with my customizations. One thing that my kernel does is take the CPU from all other processes (including tasklet threads) for long periods of time. I'll see if I can trigger this with the hackbench of highest priority on -rt, which does the same thing. -- Steve