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    Subject[PATCH] mm: sync rss-counters at the end of exit_mm()
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    On task's exit do_exit() calls sync_mm_rss() but this is not enough,
    there can be page-faults after this point, for example exit_mm() ->
    mm_release() -> put_user() (for processing tsk->clear_child_tid).
    Thus there may be some rss-counters delta in current->rss_stat.

    Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
    Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
    Cc: Hugh Dickins <hughd@google.com>
    Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    ---
    kernel/exit.c | 1 +
    1 file changed, 1 insertion(+)

    diff --git a/kernel/exit.c b/kernel/exit.c
    index d8bd3b42..8e09dbe 100644
    --- a/kernel/exit.c
    +++ b/kernel/exit.c
    @@ -683,6 +683,7 @@ static void exit_mm(struct task_struct * tsk)
    enter_lazy_tlb(mm, current);
    task_unlock(tsk);
    mm_update_next_owner(mm);
    + sync_mm_rss(mm);
    mmput(mm);
    }



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