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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