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    Subject[PATCH 2/3] slub: reduce failure of this_cpu_cmpxchg in put_cpu_partial() after unfreezing
    In current implementation, after unfreezing, we doesn't touch oldpage,
    so it remain 'NOT NULL'. When we call this_cpu_cmpxchg()
    with this old oldpage, this_cpu_cmpxchg() is mostly be failed.

    We can change value of oldpage to NULL after unfreezing,
    because unfreeze_partial() ensure that all the cpu partial slabs is removed
    from cpu partial list. In this time, we could expect that
    this_cpu_cmpxchg is mostly succeed.

    Signed-off-by: Joonsoo Kim <>

    diff --git a/mm/slub.c b/mm/slub.c
    index 92f1c0e..531d8ed 100644
    --- a/mm/slub.c
    +++ b/mm/slub.c
    @@ -1968,6 +1968,7 @@ int put_cpu_partial(struct kmem_cache *s, struct page *page, int drain)
    + oldpage = NULL;
    pobjects = 0;
    pages = 0;
    stat(s, CPU_PARTIAL_DRAIN);

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      Last update: 2012-06-22 21:01    [W:0.022 / U:21.528 seconds]
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