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hugetlb/cgroup: add the cgroup pointer to page lru

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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@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aneesh Kumar K.V
2012-07-31 16:42:15 -07:00
committed by Linus Torvalds
parent 2bc64a2046
commit 9dd540e231
2 changed files with 41 additions and 0 deletions
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37
include/linux/hugetlb_cgroup.h
View File

@@ -18,8 +18,34 @@
#include <linux/res_counter.h>
struct hugetlb_cgroup;
/*
* Minimum page order trackable by hugetlb cgroup.
* At least 3 pages are necessary for all the tracking information.
*/
#define HUGETLB_CGROUP_MIN_ORDER 2
#ifdef CONFIG_CGROUP_HUGETLB
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
{
VM_BUG_ON(!PageHuge(page));
if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
return NULL;
return (struct hugetlb_cgroup *)page[2].lru.next;
}
static inline
int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
{
VM_BUG_ON(!PageHuge(page));
if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER)
return -1;
page[2].lru.next = (void *)h_cg;
return 0;
}
static inline bool hugetlb_cgroup_disabled(void)
{
if (hugetlb_subsys.disabled)
@@ -28,6 +54,17 @@ static inline bool hugetlb_cgroup_disabled(void)
}
#else
static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page)
{
return NULL;
}
static inline
int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg)
{
return 0;
}
static inline bool hugetlb_cgroup_disabled(void)
{
return true;