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Message-ID: <1328889127.25989.14.camel@laptop> Date: Fri, 10 Feb 2012 16:52:07 +0100 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: Ingo Molnar <mingo@...e.hu> Cc: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>, paul@...lmenage.org, rjw@...k.pl, tj@...nel.org, frank.rowand@...sony.com, pjt@...gle.com, tglx@...utronix.de, lizf@...fujitsu.com, prashanth@...ux.vnet.ibm.com, paulmck@...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 Thu, 2012-02-09 at 16:11 +0100, Ingo Molnar wrote: > > My understanding of the code is that when a CPU is taken > > offline, it is removed from all the cpusets and then the > > scan_for_empty_cpusets() function is run to move tasks from > > empty cpusets to their parent cpusets. > > Why is that done that way? offlining a CPU should be an > invariant as far as cpusets are concerned. Can't, tasks need to run someplace. There's two choices, add a still online cpu to the now empty cpuset or move the tasks to a parent that still has online cpus. Both are destructive. -- 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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