On Fri, Sep 21, 2012 at 11:14:45PM +0300, Pekka Enberg wrote:

On Fri, Sep 21, 2012 at 11:07 PM, Tejun Heo [off-list ref] wrote:

quoted

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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