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    SubjectRe: [PATCH v3 09/16] sl[au]b: always get the cache from its page in kfree
    On Fri, Sep 21, 2012 at 11:14:45PM +0300, Pekka Enberg wrote:
    > On Fri, Sep 21, 2012 at 11:07 PM, Tejun Heo <tj@kernel.org> wrote:
    > > Not necessarily disagreeing, but I don't think it's helpful to set the
    > > bar impossibly high. Even static_key doesn't have "exactly *zero*"
    > > impact. Let's stick to as minimal as possible when not in use and
    > > reasonable in use.
    >
    > For !CONFIG_MEMCG_KMEM, it should be exactly zero. No need to play
    > games with static_key.

    Ah, misread, though you were talking about MEMCG_KMEM && not in use.
    Yeap, if turned off in Kconfig, it shouldn't have any performance
    overhead.

    Thanks.

    --
    tejun


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