linux-kernel - Re: [patch 08/15] sched: migrate throttled tasks on HOTPLUG

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Message-ID: <1302010092.2225.1317.camel@twins>
Date:	Tue, 05 Apr 2011 15:28:12 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Turner <pjt@...gle.com>
Cc:	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...e.hu>, Pavel Emelyanov <xemul@...nvz.org>
Subject: Re: [patch 08/15] sched: migrate throttled tasks on HOTPLUG

On Tue, 2011-03-22 at 20:03 -0700, Paul Turner wrote:
> Throttled tasks are invisisble to cpu-offline since they are not eligible for
> selection by pick_next_task().  The regular 'escape' path for a thread that is
> blocked at offline is via ttwu->select_task_rq, however this will not handle a
> throttled group since there are no individual thread wakeups on an unthrottle.
> 
> Resolve this by unthrottling offline cpus so that threads can be migrated.

Fair enough, the flip side is that they all can again increase their
debt by a whole tick, right?
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