From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261568AbTFCWLv (ORCPT ); Tue, 3 Jun 2003 18:11:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261840AbTFCWLu (ORCPT ); Tue, 3 Jun 2003 18:11:50 -0400 Received: from mail.gmx.net ([213.165.64.20]:46243 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S261568AbTFCWLs (ORCPT ); Tue, 3 Jun 2003 18:11:48 -0400 Message-Id: <5.2.0.9.2.20030604001215.00ce2850@pop.gmx.net> X-Mailer: QUALCOMM Windows Eudora Version 5.2.0.9 Date: Wed, 04 Jun 2003 00:29:44 +0200 To: "J.A. Magallon" From: Mike Galbraith Subject: Re: sched.c gives ICE [Was: Re: web page on O(1) scheduler] Cc: linux-kernel@vger.kernel.org In-Reply-To: <20030603205929.GC3661@werewolf.able.es> References: <5.2.0.9.2.20030522114349.00cfd8f8@pop.gmx.net> <5.2.0.9.2.20030521111037.01ed0d58@pop.gmx.net> <16075.8557.309002.866895@napali.hpl.hp.com> <5.2.0.9.2.20030521111037.01ed0d58@pop.gmx.net> <5.2.0.9.2.20030522114349.00cfd8f8@pop.gmx.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org At 10:59 PM 6/3/2003 +0200, J.A. Magallon wrote: >On 05.22, Mike Galbraith wrote: > > At 10:56 AM 5/21/2003 -0700, David Mosberger wrote: > > > >>>>> On Wed, 21 May 2003 11:26:31 +0200, Mike Galbraith > > > said: > > > > > > Mike> The page mentions persistent starvation. My own explorations > > > Mike> of this issue indicate that the primary source is always > > > Mike> selecting the highest priority queue. > > > > > >My working assumption is that the problem is a bug with the dynamic > > >prioritization. The task receiving the signals calls sleep() after > > >handling a signal and hence it's dynamic priority should end up higher > > >than the priority of the task sending signals (since the sender never > > >relinquishes the CPU voluntarily). > > > > > >However, I haven't actually had time to look at the relevant code, so > > >I may be missing something. If you understand the issue better, > > >please explain to me why this isn't a dynamic priority issue. > > > > You're right, it looks like a corner case. It works fine here with the > > attached diff. > > > >Have you tried to build with gcc-3.3 ? I applied it on top of 2.4.x-aa, >and I just get an ICE: No, I use 2.95.3. >End of search list. >sched.c: In function `do_schedule': >sched.c:1003: internal compiler error: in merge_assigned_reloads, at >reload1.c:6134 >Please submit a full bug report, >with preprocessed source if appropriate. >See for instructions. > >sched.c::1003 is the closing brace for do_schedule(). > >Any idea ? Nope... gcc can have the blame if it wants it :) -Mike