Re: [PATCH -mmotm 2/8] cgroup: introduce coalesce css_get() and css_put()

[Paul Menage <menage@google.com>]

On Sun, Dec 13, 2009 at 10:19 PM, Daisuke Nishimura
<nishimura@mxp.nes.nec.co.jp> wrote:
> Current css_get() and css_put() increment/decrement css->refcnt one by one.
>
> This patch add a new function __css_get(), which takes "count" as a arg and
> increment the css->refcnt by "count". And this patch also add a new arg("count")
> to __css_put() and change the function to decrement the css->refcnt by "count".
>
> These coalesce version of __css_get()/__css_put() will be used to improve
> performance of memcg's moving charge feature later, where instead of calling
> css_get()/css_put() repeatedly, these new functions will be used.
>
> No change is needed for current users of css_get()/css_put().
>
> Changelog: 2009/12/14
> - new patch(I split "[4/7] memcg: improbe performance in moving charge" of
>  04/Dec version into 2 part: cgroup part and memcg part. This is the cgroup
>  part.)
>
> Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>

Acked-by: Paul Menage <menage@google.com>

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