Re: [RFC][PATCH v3 1/6] mm: Don't unmap gup()ed page

[Andrea Arcangeli]

On Tue, Apr 14, 2009 at 10:39:54PM +0900, KOSAKI Motohiro wrote:
> I guess you dislike get_user_page_fast() grab pte_lock too, right?

If get_user_page_fast is vetoed to run a set_bit on the already cache
hot and exclusive struct page, I doubt taking a potentially cache
cold, mm-wide or pmd-wide pte_lock is ok.
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