Re: [patch 11/11] mm: memcg: only check anon swapin page chargesfor swap cache

[Kamezawa Hiroyuki]

(2012/07/05 9:45), Johannes Weiner wrote:
> shmem knows for sure that the page is in swap cache when attempting to
> charge a page, because the cache charge entry function has a check for
> it.  Only anon pages may be removed from swap cache already when
> trying to charge their swapin.
> 
> Adjust the comment, though: '4969c11 mm: fix swapin race condition'
> added a stable PageSwapCache check under the page lock in the
> do_swap_page() before calling the memory controller, so it's
> unuse_pte()'s pte_same() that may fail.
> 
> Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>


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