Re: [RFC:Patch: 000/008](memory hotplug) rough idea of pgdat removing

[Christoph Lameter]

Yasunori Goto wrote:

>>> Thanks for your comment.
>> Duh. Then the use of RCU would also mean that all of reclaim must
>>  be in a rcu period. So  reclaim cannot sleep anymore.
> 
> I use srcu_read_lock() (sleepable rcu lock) if kernel must be sleep for
> page reclaim. So, my patch basic idea is followings.

But that introduces more overhead in __alloc_pages.
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