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    SubjectRe: [patch 7/8] mm: memcg: modify PageCgroupAcctLRU non-atomically
    On Thu, Nov 24, 2011 at 09:09:15AM +0900, KAMEZAWA Hiroyuki wrote:
    > On Wed, 23 Nov 2011 16:42:30 +0100
    > Johannes Weiner <hannes@cmpxchg.org> wrote:
    >
    > > From: Johannes Weiner <jweiner@redhat.com>
    > >
    > > This bit is protected by zone->lru_lock, there is no need for locked
    > > operations when setting and clearing it.
    > >
    > > Signed-off-by: Johannes Weiner <jweiner@redhat.com>
    >
    > This atomic ops are for avoiding race with other ops as lock_page_cgroup().
    > Or other Set/ClearPageCgroup....
    >
    > Do I misunderstand atomic ops v.s. non-atomic ops race ?

    Nope, you are spot-on. I'm the cretin. ;-) See my reply to Hugh's
    email.


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