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

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Message-ID: <20120614092539.GI27397@tiehlicka.suse.cz>
Date:	Thu, 14 Jun 2012 11:25:40 +0200
From:	Michal Hocko <mhocko@...e.cz>
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, 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

On Wed 13-06-12 15:57:30, Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> 
> This patchset add the charge and uncharge routines for hugetlb cgroup.
> We do cgroup charging in page alloc and uncharge in compound page
> destructor. Assigning page's hugetlb cgroup is protected by hugetlb_lock.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

Reviewed-by: Michal Hocko <mhocko@...e.cz>

One minor comment
[...]
> +void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
> +				  struct hugetlb_cgroup *h_cg,
> +				  struct page *page)
> +{
> +	if (hugetlb_cgroup_disabled() || !h_cg)
> +		return;
> +
> +	spin_lock(&hugetlb_lock);
> +	set_hugetlb_cgroup(page, h_cg);
> +	spin_unlock(&hugetlb_lock);
> +	return;
> +}

I guess we can remove the lock here because nobody can see the page yet,
right?

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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