Re: [PATCH V2 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non_movable()

[Benjamin LaHaise]

On Wed, Feb 06, 2013 at 09:42:34AM +0900, Minchan Kim wrote:
> THP degradation by increasing MIGRATE_UNMOVABLE?
> Lin said most of GUP pages release the page in short so is it really problem?
> Even in embedded, we don't use THP yet but CMA and GUP call would be not too often
> but failing of CMA would be critical.
> 
> I'd like to hear opinions.

If aio was given a callback to migrate the pages on, it could just migrate 
the pages as needed.  There's nothing fundamental preventing that approach.

		-ben
-- 
"Thought is the essence of where you are now."
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