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

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Message-ID: <87txykfmco.fsf@skywalker.in.ibm.com>
Date:	Sat, 09 Jun 2012 22:34:23 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	linux-mm@...ck.org, kamezawa.hiroyu@...fujitsu.com,
	dhillf@...il.com, rientjes@...gle.com, mhocko@...e.cz,
	akpm@...ux-foundation.org, hannes@...xchg.org
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH -V8 10/16] hugetlb/cgroup: Add the cgroup pointer to page lru

"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> writes:

> 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;
> +	if (compound_order(page) < 3)

That should be if (compound_order(page) < 2) ? I will send an updated
patchset with this fix and other review changes.


-aneesh 

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