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Date: Sat, 9 Jun 2012 14:29:55 +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, "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> Subject: [PATCH -V8 10/16] hugetlb/cgroup: Add the cgroup pointer to page lru 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) + 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; +} + static inline bool hugetlb_cgroup_disabled(void) { if (hugetlb_subsys.disabled) @@ -43,6 +63,17 @@ extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, struct hugetlb_cgroup *h_cg); #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; diff --git a/mm/hugetlb.c b/mm/hugetlb.c index e899a2d..1ca2d8f 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -28,6 +28,7 @@ #include <linux/io.h> #include <linux/hugetlb.h> +#include <linux/hugetlb_cgroup.h> #include <linux/node.h> #include "internal.h" @@ -591,6 +592,7 @@ static void update_and_free_page(struct hstate *h, struct page *page) 1 << PG_active | 1 << PG_reserved | 1 << PG_private | 1 << PG_writeback); } + BUG_ON(hugetlb_cgroup_from_page(page)); set_compound_page_dtor(page, NULL); set_page_refcounted(page); arch_release_hugepage(page); @@ -643,6 +645,7 @@ static void prep_new_huge_page(struct hstate *h, struct page *page, int nid) INIT_LIST_HEAD(&page->lru); set_compound_page_dtor(page, free_huge_page); spin_lock(&hugetlb_lock); + set_hugetlb_cgroup(page, NULL); h->nr_huge_pages++; h->nr_huge_pages_node[nid]++; spin_unlock(&hugetlb_lock); @@ -892,6 +895,7 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid) INIT_LIST_HEAD(&page->lru); r_nid = page_to_nid(page); set_compound_page_dtor(page, free_huge_page); + set_hugetlb_cgroup(page, NULL); /* * We incremented the global counters already */ -- 1.7.10 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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