Andrew Morton wrote:
> On Mon, 10 Sep 2007 11:45:10 +0200 (CEST) Simon Derr <[email protected]> wrote:
>
>> 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.
>>
>
> Yeah. Bug, surely. But I guess it's always been there.
>
> What are the implications of this for cpusets-via-containers?
>
I suspect the functionality of cpusets is not affected by containers.
I wonder if containers should become suspend/resume aware and pass
that option on to controllers. I think it's only the bus drivers
and device drivers that do that now.
--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL
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