Re: [PATCH 07/12] memcg: use css_get/put when charging/unchargingkmem

From: Kamezawa Hiroyuki
Date: Mon Apr 08 2013 - 22:55:40 EST

(2013/04/08 15:34), Li Zefan wrote:
> Use css_get/put instead of mem_cgroup_get/put.
> We can't do a simple replacement, because here mem_cgroup_put()
> is called during mem_cgroup_css_free(), while mem_cgroup_css_free()
> won't be called until css refcnt goes down to 0.
> Instead we increment css refcnt in mem_cgroup_css_offline(), and
> then check if there's still kmem charges. If not, css refcnt will
> be decremented immediately, otherwise the refcnt won't be decremented
> when kmem charges goes down to 0.
> v2:
> - added wmb() in kmem_cgroup_css_offline(), pointed out by Michal
> - revised comments as suggested by Michal
> - fixed to check if kmem is activated in kmem_cgroup_css_offline()
> Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

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