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

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Date:	Mon, 5 Nov 2012 13:34:27 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	<hannes@...xchg.org>, <mhocko@...e.cz>, <bsingharora@...il.com>,
	<kamezawa.hiroyu@...fujitsu.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

On 2012/11/1 3:44, 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.
> 
> * 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().
> 
> This patch keeps the two for_each_subsys() loops separate while open
> coding them.  They can be merged now but there are scheduled changes
> which need them to be separate, so keep them separate to reduce the
> amount of churn.
> 
> local_irq_save/restore() from cgroup_clear_css_refs() are replaced
> with local_irq_disable/enable() for simplicity.  This is safe as
> cgroup_rmdir() is always called with IRQ enabled.  Note that this IRQ
> switching is necessary to make CSS deactivation and CSS_REMOVED
> assertion atomic against css_tryget() and will be removed by future
> changes.
> 
> v2: cgroup_call_pre_destroy() removal dropped per Michal.  Commit
>     message updated to explain local_irq_disable/enable() conversion.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Reviewed-by: Michal Hocko <mhocko@...e.cz>

Acked-by: Li Zefan <lizefan@...wei.com>


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