Re: [PATCH 1/10] memory-hotplug : check whether memory is offlineor not when removing memory

From: Wen Congyang
Date: Fri Oct 19 2012 - 21:47:35 EST

At 10/20/2012 02:33 AM, KOSAKI Motohiro Wrote:
>> I think it again, and found that this check is necessary. Because we only
>> lock memory hotplug when offlining pages. Here is the steps to offline and
>> remove memory:
>> 1. lock memory hotplug
>> 2. offline a memory section
>> 3. unlock memory hotplug
>> 4. repeat 1-3 to offline all memory sections
>> 5. lock memory hotplug
>> 6. remove memory
>> 7. unlock memory hotplug
>> All memory sections must be offlined before removing memory. But we don't
>> hold
>> the lock in the whole operation. So we should check whether all memory
>> sections
>> are offlined before step6.
> You should describe the race scenario in the patch description. OK?


Wen Congyang
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