linux-kernel - Re: [PATCH -V8 10/16] hugetlb/cgroup: Add the cgroup pointer to page lru

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Date:	Tue, 12 Jun 2012 16:52:16 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
CC:	linux-mm@...ck.org, 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 -V8 10/16] hugetlb/cgroup: Add the cgroup pointer to page
 lru

(2012/06/09 17:59), Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V"<aneesh.kumar@...ux.vnet.ibm.com>
> 
> Add the hugetlb cgroup pointer to 3rd page lru.next. This limit
> the usage to hugetlb cgroup to only hugepages with 3 or more
> normal pages. I guess that is an acceptable limitation.
> 
> Signed-off-by: Aneesh Kumar K.V<aneesh.kumar@...ux.vnet.ibm.com>
> ---
>   include/linux/hugetlb_cgroup.h |   31 +++++++++++++++++++++++++++++++
>   mm/hugetlb.c                   |    4 ++++
>   2 files changed, 35 insertions(+)
> 
> diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
> index 5794be4..ceff1d5 100644
> --- a/include/linux/hugetlb_cgroup.h
> +++ b/include/linux/hugetlb_cgroup.h
> @@ -26,6 +26,26 @@ struct hugetlb_cgroup {
>   };
> 
>   #ifdef CONFIG_CGROUP_HUGETLB_RES_CTLR
> +static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
> +{
> +	if (!PageHuge(page))
> +		return NULL;

I'm not very sure but....

	VM_BUG_ON(!PageHuge(page)) ??



> +	if (compound_order(page)<  3)
> +		return NULL;
> +	return (struct hugetlb_cgroup *)page[2].lru.next;
> +}
> +
> +static inline
> +int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
> +{
> +	if (!PageHuge(page))
> +		return -1;

ditto.

> +	if (compound_order(page)<  3)
> +		return -1;
> +	page[2].lru.next = (void *)h_cg;
> +	return 0;
> +}
> +

Thanks,
-Kame

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