linux-kernel - Re: [PATCH v3 5/5] cpusets, suspend: Save and restore cpusets during suspend/resume

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Message-ID: <1337203449.4281.15.camel@twins>
Date:	Wed, 16 May 2012 23:24:09 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	David Rientjes <rientjes@...gle.com>,
	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>,
	mingo@...nel.org, pjt@...gle.com, paul@...lmenage.org,
	akpm@...ux-foundation.org, rjw@...k.pl, nacc@...ibm.com,
	paulmck@...ux.vnet.ibm.com, tglx@...utronix.de,
	seto.hidetoshi@...fujitsu.com, tj@...nel.org, mschmidt@...hat.com,
	berrange@...hat.com, nikunj@...ux.vnet.ibm.com,
	vatsa@...ux.vnet.ibm.com, liuj97@...il.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v3 5/5] cpusets, suspend: Save and restore cpusets
 during suspend/resume

On Wed, 2012-05-16 at 03:46 +0530, Srivatsa S. Bhat wrote:
> 
> However, the cpu_active_mask was introduced to handle situations where hotplug
> transition is still in progress, and the scheduler needs to take appropriate
> decisions even with some of its data-structures in an inconsistent/stale state.
> But once the hotplug operation is completed, the scheduler doesn't need to
> depend on cpu_active_mask.

> (And on those lines, making the scheduler work correctly even in such cases
> is only a good-to-have as a robustness measure and not a "bugfix".) 

I think those 2(?) cases you found not covered by active mask could
actually happen during a hotplug. So far they simply haven't.
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