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

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Date:	Fri, 22 Jun 2012 15:11:21 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	<linux-mm@...ck.org>, <kamezawa.hiroyu@...fujitsu.com>,
	<dhillf@...il.com>, <rientjes@...gle.com>, <mhocko@...e.cz>,
	<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

On Thu, 14 Jun 2012 16:58:05 +0800
Li Zefan <lizefan@...wei.com> wrote:

> > +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.
> 

Aneesh?
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