linux-kernel - Re: [PATCH 1/1] sched: unthrottle rt runqueues in __disable

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Message-ID: <1345105317.29668.1.camel@twins>
Date:	Thu, 16 Aug 2012 10:21:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Peter Boonstoppel <pboonstoppel@...dia.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 1/1] sched: unthrottle rt runqueues in
 __disable_runtime()

On Thu, 2012-08-09 at 15:34 -0700, Peter Boonstoppel wrote:
> migrate_tasks() uses _pick_next_task_rt() to get tasks from the
> real-time runqueues to be migrated. When rt_rq is throttled
> _pick_next_task_rt() won't return anything, in which case
> migrate_tasks() can't move all threads over and gets stuck in an
> infinite loop.
> 
> Instead unthrottle rt runqueues before migrating tasks.
> 
> Additionally: move unthrottle_offline_cfs_rqs() to rq_offline_fair()

Thanks!
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