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Date: Sat, 11 Feb 2012 09:56:57 +0530 From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> CC: "Rafael J. Wysocki" <rjw@...k.pl>, Alan Stern <stern@...land.harvard.edu>, paulmck@...ux.vnet.ibm.com, Ingo Molnar <mingo@...e.hu>, 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 02/11/2012 07:37 AM, Peter Zijlstra wrote: > 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? > Sure! After you pointed out that CPU Hotplug is destructive in general and hence it is not a good idea to put back online CPUs to cpusets, the next thing I thought of trying was a special case handling for suspend/resume alone, IOW, not calling the cpuset update upon CPU_TASKS_FROZEN. So, yes, I'll write up a patch for that and post it soon :-) Regards, Srivatsa S. Bhat -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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