Re: [patch v2 2/6] memcg: keep prev's css alive for the whole mem_cgroup_iter

[Kamezawa Hiroyuki]

(2012/11/27 3:47), Michal Hocko wrote:
> css reference counting keeps the cgroup alive even though it has been
> already removed. mem_cgroup_iter relies on this fact and takes a
> reference to the returned group. The reference is then released on the
> next iteration or mem_cgroup_iter_break.
> mem_cgroup_iter currently releases the reference right after it gets the
> last css_id.
> This is correct because neither prev's memcg nor cgroup are accessed
> after then. This will change in the next patch so we need to hold the
> group alive a bit longer so let's move the css_put at the end of the
> function.
> 
> Signed-off-by: Michal Hocko <mhocko@xxxxxxx>

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


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/