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    SubjectRe: [PATCH 2/2] slub: fix Objects count
    On Sat, 3 Nov 2007, Hugh Dickins wrote:

    > The count of active Objects shown by Slub's slabinfo is too approximate,
    > because each cpu slab is counted as all in use, even when lots are free.
    > That makes tracing leaks harder than it need be.

    True but that is the way it is for performance reasons.

    > Add a free count into kmem_cache_cpu (which doesn't enlarge it on 64-bit),
    > to keep that count in the hot and dirty per-cpu cacheline.

    Adds to much overhead to the fast paths and will make the current
    optimizations in mm impossible.

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