Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756050AbXJBTiO (ORCPT ); Tue, 2 Oct 2007 15:38:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751451AbXJBTh7 (ORCPT ); Tue, 2 Oct 2007 15:37:59 -0400 Received: from ms-smtp-01.nyroc.rr.com ([24.24.2.55]:53326 "EHLO ms-smtp-01.nyroc.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751448AbXJBTh6 (ORCPT ); Tue, 2 Oct 2007 15:37:58 -0400 Date: Tue, 2 Oct 2007 15:37:28 -0400 (EDT) From: Steven Rostedt X-X-Sender: rostedt@gandalf.stny.rr.com To: Mike Kravetz cc: Ingo Molnar , Linux Kernel Mailing List , Thomas Gleixner , Clark Williams Subject: Re: -rt scheduling: wakeup bug? In-Reply-To: <20071002193050.GB3162@monkey.ibm.com> Message-ID: References: <20071001221519.GA20671@monkey.ibm.com> <20071002050632.GB28345@elte.hu> <20071002193050.GB3162@monkey.ibm.com> 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: 1247 Lines: 33 -- On Tue, 2 Oct 2007, Mike Kravetz wrote: > On Tue, Oct 02, 2007 at 07:06:32AM +0200, Ingo Molnar wrote: > > * Mike Kravetz wrote: > > > > > > My observations/debugging/conclusions are based on an earlier version > > > of the code. It appears the same code/issue still exists in the most > > > version. But, I have not not done any work with the latest version. > > > > I believe you are right - nice catch of this very nontrivial bug! The > > patch below is against .23-rc - do you think this fix (of moving the rt > > wakeup sequence to after the activate_task()) is adequate? > > Yes, I have been running with a similar patch on a (much) earlier > version of the code. It has helped quite a bit. I would have > put together a patch for a later version, but my test environment > is limited to this earlier version. FYI, I've incorporated Ingo's patch into the lastest -rt release. http://www.kernel.org/pub/linux/kernel/projects/rt/patch-2.6.23-rc9-rt1.bz2 -- 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/