Re: [PATCH 06/12] memcg: don't use mem_cgroup_get() when creatinga kmemcg cache
From: Kamezawa Hiroyuki
Date: Mon Apr 08 2013 - 22:53:42 EST
(2013/04/08 15:34), Li Zefan wrote:
> Use css_get()/css_put() instead of mem_cgroup_get()/mem_cgroup_put().
> There are two things being done in the current code:
> First, we acquired a css_ref to make sure that the underlying cgroup
> would not go away. That is a short lived reference, and it is put as
> soon as the cache is created.
> At this point, we acquire a long-lived per-cache memcg reference count
> to guarantee that the memcg will still be alive.
> so it is:
> enqueue: css_get
> create : memcg_get, css_put
> destroy: memcg_put
> So we only need to get rid of the memcg_get, change the memcg_put to
> css_put, and get rid of the now extra css_put.
> (This changelog is basically written by Glauber)
> Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>
> Acked-by: Michal Hocko <mhocko@xxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
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