linux-kernel - Re: [PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css

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Date:	Fri, 02 Nov 2012 18:23:10 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>
CC:	lizefan@...wei.com, hannes@...xchg.org, mhocko@...e.cz,
	bsingharora@...il.com, containers@...ts.linux-foundation.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/8] cgroup: kill cgroup_subsys->__DEPRECATED_clear_css_refs

(2012/10/31 13:22), Tejun Heo wrote:
> 2ef37d3fe4 ("memcg: Simplify mem_cgroup_force_empty_list error
> handling") removed the last user of __DEPRECATED_clear_css_refs.  This
> patch removes __DEPRECATED_clear_css_refs and mechanisms to support
> it.
> 
> * Conditionals dependent on __DEPRECATED_clear_css_refs removed.
> 
> * ->pre_destroy() now can only fail if a new task is attached or child
>    cgroup is created while ->pre_destroy()s are being called.  As the
>    condition is checked again after re-acquiring cgroup_mutex
>    afterwards, we don't need to take any immediate action on
>    ->pre_destroy() failures.  This reduces cgroup_call_pre_destroy() to
>    a simple loop surrounding ->pre_destory().  Remove
>    cgroup_call_pre_destroy() and open-code the loop into
>    cgroup_rmdir().
> 
> * cgroup_clear_css_refs() can no longer fail.  All that needs to be
>    done are deactivating refcnts, setting CSS_REMOVED and putting the
>    base reference on each css.  Remove cgroup_clear_css_refs() and the
>    failure path, and open-code the loops into cgroup_rmdir().
> 
> Note that cgroup_rmdir() will see more cleanup soon.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>

I thank you and Michal for this work.

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujisu.com>




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