linux-kernel - Re: [PATCH RT] Fix RT balancing tasks pulling

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Message-ID: <20070725072700.GC26955@elte.hu>
Date:	Wed, 25 Jul 2007 09:27:00 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Sébastien Dugué <sebastien.dugue@...l.net>
Cc:	Linux RT Users <linux-rt-users@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jean Pierre Dion <jean-pierre.dion@...l.net>,
	Darren Hart <dvhltc@...ibm.com>,
	john stultz <johnstul@...ibm.com>,
	Josh Triplett <josht@...ux.vnet.ibm.com>
Subject: Re: [PATCH RT] Fix RT balancing tasks pulling


* Sébastien Dugué <sebastien.dugue@...l.net> wrote:

>   Hi Ingo, Thomas,
> 
>   this one-liner fixes a bug in balance_rt_tasks() which sometimes 
> manifests by having a lower prio task being scheduled while a higher 
> prio task is sitting waiting on another runqueue.
> 
>   This is pretty hard to reproduce on low cpu count machines, for 
> example, I had to have sched_football run in a loop for ~38h before it 
> failed on a dual HT Xeon box.

really nice catch! Applied.

	Ingo
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