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

[Aneesh Kumar K.V]

Kamezawa Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> 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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