linux-kernel - Re: [PATCH] sched: fix rt-bandwidth hotplug race

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Message-ID: <20080814135122.GB14333@elte.hu>
Date:	Thu, 14 Aug 2008 15:51:22 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Alex Nixon <alex.nixon@...rix.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: fix rt-bandwidth hotplug race


* Peter Zijlstra <peterz@...radead.org> wrote:

> Subject: sched: fix rt-bandwidth hotplug race
> From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Date: Thu Aug 14 15:42:44 CEST 2008
> 
> When we hot-unplug a cpu and rebuild the sched-domain, all cpus will be
> detatched. Alex observed the case where a runqueue was stealing bandwidth
> from an already disabled runqueue to satisfy its own needs.
> 
> Stop this by skipping over already disabled runqueues.
> 
> Reported-by: Alex Nixon <alex.nixon@...rix.com>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Tested-by: Alex Nixon <alex.nixon@...rix.com>

applied to tip/sched/urgent - thanks!

	Ingo
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