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    SubjectRe: [patch 11/11] mm: memcg: only check anon swapin page charges for swap cache
    (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@cmpxchg.org>

    Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>




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