linux-kernel - Re: [PATCH 0/4] CPU hotplug, cpusets: Fix CPU online handling related to cpusets

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Message-ID: <1328926042.2476.3.camel@laptop>
Date:	Sat, 11 Feb 2012 03:07:22 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Alan Stern <stern@...land.harvard.edu>, paulmck@...ux.vnet.ibm.com,
	Ingo Molnar <mingo@...e.hu>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	paul@...lmenage.org, tj@...nel.org, frank.rowand@...sony.com,
	pjt@...gle.com, tglx@...utronix.de, lizf@...fujitsu.com,
	prashanth@...ux.vnet.ibm.com, vatsa@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/4] CPU hotplug, cpusets: Fix CPU online handling
 related to cpusets

On Fri, 2012-02-10 at 23:39 +0100, Rafael J. Wysocki wrote:
> 
> > I don't see why not.  Presumably no CPUs will be added or removed while 
> > the system is asleep.
> 
> ACPI explicitly forbids that level of hardware reconfiguration in a sleep
> state (even in S4), AFAICS.  Still, people may try to do that ... 

I'm ok with breaking that :-) If its really really important to someone
we (him most likely) could fix it by detecting the topology changed over
the suspend and do a fixup. Assuming it actually gets that far.

Srivatsa, wanna give this (the proposal to not modify cpusets on
CPU_TASKS_FROZEN) a try?


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