linux-kernel - Re: [PATCH -V7 07/14] mm/page_cgroup: Make page_cgroup point to the cgroup rather than the mem

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Message-ID: <87sje72bab.fsf@skywalker.in.ibm.com>
Date:	Fri, 08 Jun 2012 00:35:00 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.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 -V7 07/14] mm/page_cgroup: Make page_cgroup point to the cgroup rather than the mem_cgroup

Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com> writes:

> You can use other pages than head/tails.
> For example,I think you have 512 pages per 2M pages.

How about the below. This limit the usage to hugetlb cgroup to only
hugepages with more than 3 normal pages. I guess that is an acceptable limitation.

static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
{
	if (!PageHuge(page))
		return NULL;
	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;
	if (compound_order(page) < 3)
		return -1;
	page[2].lru.next = (void *)h_cg;
	return 0;
}


-aneesh

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