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Date: Thu, 9 Feb 2012 08:57:01 +0100 From: Ingo Molnar <mingo@...e.hu> To: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>, 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 * Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com> wrote: > IOW, consider: > > cpuset A has 0-10 > > - Take CPU 10 offline > [We are forced to remove CPU 10 from cpuset A, which becomes 0-9 now] > > > <Userspace didn't request any change to cpuset A> > > > - Bring back CPU 10 online > > Now cpuset A is still 0-9! IMO, it should have been 0-10. Why is CPU 10 taken out of the cpuset to begin with? The cpuset code should be fixed to work with offline CPUs as well - it can obviously not schedule to them, but otherwise it should be fine to have a wider cpuset than the hw can support. Thanks, Ingo -- 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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