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Date: Sun, 6 Jan 2013 16:29:09 +0800
From: Li Zefan <lizefan@huawei.com>
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To: Tejun Heo <tj@kernel.org>
CC: <paul@paulmenage.org>, <glommer@parallels.com>,
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        <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 10/13] cpuset: make CPU / memory hotplug propagation asynchronous
References: <1357248967-24959-1-git-send-email-tj@kernel.org> <1357248967-24959-11-git-send-email-tj@kernel.org>
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> +static void schedule_cpuset_propagate_hotplug(struct cpuset *cs)
> +{
> +	/*
> +	 * Pin @cs.  The refcnt will be released when the work item
> +	 * finishes executing.
> +	 */
> +	if (!css_tryget(&cs->css))
> +		return;
> +
> +	/*
> +	 * Queue @cs->empty_cpuset_work.  If already pending, lose the css

cs->hotplug_work

> +	 * ref.  cpuset_propagate_hotplug_wq is ordered and propagation
> +	 * will happen in the order this function is called.
> +	 */
> +	if (!queue_work(cpuset_propagate_hotplug_wq, &cs->hotplug_work))
> +		css_put(&cs->css);
>  }