Messages in this thread | | | Date | Mon, 10 Sep 2007 11:45:10 +0200 (CEST) | From | Simon Derr <> | Subject | Re: cpuset trouble after hibernate |
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On Sat, 8 Sep 2007, Nicolas Capit wrote:
> Hello, > > This is my situation: > - I mounted the pseudo cpuset filesystem into /dev/cpuset > - I created a cpuset named oar with my 2 cpus > > cat /dev/cpuset/oar/cpus > 0-1 > > - Then I hibernate my computer with 'echo -n "disk" >/sys/power/state' > - After reboot: > > cat /dev/cpuset/oar/cpus > 0 > > Why did I lost a cpu? > Is this a normal behavior???
Hi Nicolas,
I believe this is related to the fact that hibernation uses the hotplug subsystem to disable all CPUs except the boot CPU.
Thus guarantee_online_cpus() is called on each cpuset and removes all CPUs, except CPU 0, from all cpusets.
I'm not quite sure about if/how this should be fixed in the kernel, though. Looks like a very simple user-land workaround would be enough.
Simon.
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