linux-kernel - Re: [RFC][mm] [PATCH 4/4] Memory cgroup hierarchy feature selector (v2)

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Date:	Sat, 08 Nov 2008 17:39:17 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Balbir Singh <balbir@...ux.vnet.ibm.com>
CC:	linux-mm@...ck.org, YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC][mm] [PATCH 4/4] Memory cgroup hierarchy feature selector
 (v2)

> +static int mem_cgroup_hierarchy_write(struct cgroup *cont, struct cftype *cft,
> +					u64 val)
> +{
> +	int retval = 0;
> +	struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
> +
> +	if (val == 1) {
> +		if (list_empty(&cont->children))

cgroup_lock should be held before checking cont->children.

> +			mem->use_hierarchy = val;
> +		else
> +			retval = -EBUSY;
> +	} else if (val == 0) {

And code duplicate.

> +		if (list_empty(&cont->children))
> +			mem->use_hierarchy = val;
> +		else
> +			retval = -EBUSY;
> +	} else
> +		retval = -EINVAL;
> +
> +	return retval;
> +}
> +

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