linux-kernel - Re: [mm] [PATCH 4/4] Memory cgroup hierarchy feature selector (v4)

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Date:	Mon, 17 Nov 2008 12:46:05 +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: [mm] [PATCH 4/4] Memory cgroup hierarchy feature selector (v4)

> +	/*
> +	 * If parent's use_hiearchy is set, we can't make any modifications
> +	 * in the child subtrees. If it is unset, then the change can
> +	 * occur, provided the current cgroup has no children.
> +	 *
> +	 * For the root cgroup, parent_mem is NULL, we allow value to be
> +	 * set if there are no children.
> +	 */
> +	if (!parent_mem || (!parent_mem->use_hierarchy &&
> +				(val == 1 || val == 0))) {

Should be :

if ((!parent_mem || !parent_mem->use_hierarchy) &&
    (val == 1 || val == 0)) {

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

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