linux-kernel - Re: [PATCH 10/13] cpuset: make CPU / memory hotplug propagation asynchronous

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Message-ID: <50E935D5.4040402@huawei.com>
Date:	Sun, 6 Jan 2013 16:29:09 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	<paul@...lmenage.org>, <glommer@...allels.com>,
	<containers@...ts.linux-foundation.org>, <cgroups@...r.kernel.org>,
	<peterz@...radead.org>, <mhocko@...e.cz>, <bsingharora@...il.com>,
	<hannes@...xchg.org>, <kamezawa.hiroyu@...fujitsu.com>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/13] cpuset: make CPU / memory hotplug propagation asynchronous

> +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);
>  }

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