Date: Tue, 3 Jun 2003 22:59:29 +0200
From: "J.A. Magallon" <jamagallon@able.es>
To: Mike Galbraith <efault@gmx.de>
Cc: linux-kernel@vger.kernel.org
Subject: sched.c gives ICE [Was: Re: web page on O(1) scheduler]
Message-ID: <20030603205929.GC3661@werewolf.able.es>
References: <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>
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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 <efault@gmx.de> 
> > 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:

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 <URL:https://qa.mandrakesoft.com/> for instructions.

sched.c::1003 is the closing brace for do_schedule().

Any idea ?

-- 
J.A. Magallon <jamagallon@able.es>      \                 Software is like sex:
werewolf.able.es                         \           It's better when it's free
Mandrake Linux release 9.2 (Cooker) for i586
Linux 2.4.21-rc6-jam1 (gcc 3.2.3 (Mandrake Linux 9.2 3.2.3-1mdk))
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