linux-kernel - Re: [PATCH v2 0/7] CPU hotplug, cpusets: Fix issues with cpusets handling upon CPU hotplug

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Message-ID: <1336165294.6509.76.camel@twins>
Date:	Fri, 04 May 2012 23:01:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...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, rob@...dley.net, tj@...nel.org,
	mschmidt@...hat.com, berrange@...hat.com,
	nikunj@...ux.vnet.ibm.com, vatsa@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH v2 0/7] CPU hotplug, cpusets: Fix issues with cpusets
 handling upon CPU hotplug

On Fri, 2012-05-04 at 13:49 -0700, Nishanth Aravamudan wrote:
> I think it's ok for hotplug to be destructive. But I guess I'm not
> entirely sure why cpusets can't retain user-inputted
> configuration/policy information even while destroying things currently?
> And re-instating that policy if possible in the future? 

Two issues here:
 - if you retain it for cpuset but not others that's confusing (too);
 - we never retain anything, if you unload a module you loose all state
that was associated with it too. What makes this special?


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