linux-kernel - Re: [git pull] scheduler updates for v2.6.24

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Message-ID: <20071015185307.GA26763@elte.hu>
Date:	Mon, 15 Oct 2007 20:53:07 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [git pull] scheduler updates for v2.6.24


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Mon, 15 Oct 2007 16:17:23 +0200
> Ingo Molnar <mingo@...e.hu> wrote:
> 
> > Linus, please pull the latest scheduler git tree from:
> > 
> >    git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched.git
> 
> Did Paul Jackson's crash get fixed?

yes - that crash was a showstopper that was holding up the pull request 
for 2 days. Paul bisected it down to the culprit and the fix was to do 
this in wake_up_new_task():

-       if (!p->sched_class->task_new || !current->se.on_rq) {
+       if (!p->sched_class->task_new || !current->se.on_rq || !rq->cfs.curr) {

(during early bootup the cfs_rq has no curr pointer yet.) It's not clear 
why this race did not trigger earlier. (and the two checks can probably 
be consolidated into a single "!rq->cfs.curr" condition.)

	Ingo
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