linux-kernel - Re: [PATCH -V9 11/15] hugetlb/cgroup: Add charge/uncharge routines for hugetlb cgroup

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Message-ID: <4FD9A79D.9030303@huawei.com>
Date:	Thu, 14 Jun 2012 16:58:05 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
CC:	<linux-mm@...ck.org>, <kamezawa.hiroyu@...fujitsu.com>,
	<dhillf@...il.com>, <rientjes@...gle.com>, <mhocko@...e.cz>,
	<akpm@...ux-foundation.org>, <hannes@...xchg.org>,
	<linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>
Subject: Re: [PATCH -V9 11/15] hugetlb/cgroup: Add charge/uncharge routines
 for hugetlb cgroup

> +int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,

> +				 struct hugetlb_cgroup **ptr)
> +{
> +	int ret = 0;
> +	struct res_counter *fail_res;
> +	struct hugetlb_cgroup *h_cg = NULL;
> +	unsigned long csize = nr_pages * PAGE_SIZE;
> +
> +	if (hugetlb_cgroup_disabled())
> +		goto done;
> +	/*
> +	 * We don't charge any cgroup if the compound page have less
> +	 * than 3 pages.
> +	 */
> +	if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER)
> +		goto done;
> +again:
> +	rcu_read_lock();
> +	h_cg = hugetlb_cgroup_from_task(current);
> +	if (!h_cg)


In no circumstances should h_cg be NULL.

> +		h_cg = root_h_cgroup;
> +
> +	if (!css_tryget(&h_cg->css)) {
> +		rcu_read_unlock();
> +		goto again;
> +	}
> +	rcu_read_unlock();
> +
> +	ret = res_counter_charge(&h_cg->hugepage[idx], csize, &fail_res);
> +	css_put(&h_cg->css);
> +done:
> +	*ptr = h_cg;
> +	return ret;
> +}


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