Re: [PATCH] mm: do not use page_count without a page pin

Andrea Arcangeli
2012-06-11T14:41:47Z

Hi Minchan,

On Mon, Jun 11, 2012 at 10:30:43PM +0900, Minchan Kim wrote:
> AFAIUC, you mean we have to increase reference count of head page?
> If so, it's not in __count_immobile_pages because it is already race-likely function
> so it shouldn't be critical although race happens.

I meant, shouldn't we take into account the full size? If it's in the
lru the whole thing can be moved away.

if (!PageLRU(page)) {
nr_pages = hpage_nr_pages(page);
barrier();
found += nr_pages;
iter += nr_pages-1;
}