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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2012-07-31 16:42:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 18:42:40 -0700
commit0edaecfab218d747d30de4575e911907371e2cd2 (patch)
tree352ef3e6d2dd13b90efddfd275e4472caeb4a697
parent189ebff2894a9d0f4e250dd1e154d282ef0a6779 (diff)
hugetlb: add a list for tracking in-use HugeTLB pages
hugepage_activelist will be used to track currently used HugeTLB pages. We need to find the in-use HugeTLB pages to support HugeTLB cgroup removal. On cgroup removal we update the page's HugeTLB cgroup to point to parent cgroup. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: David Rientjes <rientjes@google.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>
-rw-r--r--include/linux/hugetlb.h1
-rw-r--r--mm/hugetlb.c12
2 files changed, 8 insertions, 5 deletions
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 0f23c1840c9b..ed550d819044 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -211,6 +211,7 @@ struct hstate {
unsigned long resv_huge_pages;
unsigned long surplus_huge_pages;
unsigned long nr_overcommit_huge_pages;
+ struct list_head hugepage_activelist;
struct list_head hugepage_freelists[MAX_NUMNODES];
unsigned int nr_huge_pages_node[MAX_NUMNODES];
unsigned int free_huge_pages_node[MAX_NUMNODES];
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e54b695336f9..b5b6e156ca76 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -510,7 +510,7 @@ void copy_huge_page(struct page *dst, struct page *src)
static void enqueue_huge_page(struct hstate *h, struct page *page)
{
int nid = page_to_nid(page);
- list_add(&page->lru, &h->hugepage_freelists[nid]);
+ list_move(&page->lru, &h->hugepage_freelists[nid]);
h->free_huge_pages++;
h->free_huge_pages_node[nid]++;
}
@@ -522,7 +522,7 @@ static struct page *dequeue_huge_page_node(struct hstate *h, int nid)
if (list_empty(&h->hugepage_freelists[nid]))
return NULL;
page = list_entry(h->hugepage_freelists[nid].next, struct page, lru);
- list_del(&page->lru);
+ list_move(&page->lru, &h->hugepage_activelist);
set_page_refcounted(page);
h->free_huge_pages--;
h->free_huge_pages_node[nid]--;
@@ -626,10 +626,11 @@ static void free_huge_page(struct page *page)
page->mapping = NULL;
BUG_ON(page_count(page));
BUG_ON(page_mapcount(page));
- INIT_LIST_HEAD(&page->lru);
spin_lock(&hugetlb_lock);
if (h->surplus_huge_pages_node[nid] && huge_page_order(h) < MAX_ORDER) {
+ /* remove the page from active list */
+ list_del(&page->lru);
update_and_free_page(h, page);
h->surplus_huge_pages--;
h->surplus_huge_pages_node[nid]--;
@@ -642,6 +643,7 @@ static void free_huge_page(struct page *page)
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);
h->nr_huge_pages++;
@@ -890,6 +892,7 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid)
spin_lock(&hugetlb_lock);
if (page) {
+ INIT_LIST_HEAD(&page->lru);
r_nid = page_to_nid(page);
set_compound_page_dtor(page, free_huge_page);
/*
@@ -994,7 +997,6 @@ retry:
list_for_each_entry_safe(page, tmp, &surplus_list, lru) {
if ((--needed) < 0)
break;
- list_del(&page->lru);
/*
* This page is now managed by the hugetlb allocator and has
* no users -- drop the buddy allocator's reference.
@@ -1009,7 +1011,6 @@ free:
/* Free unnecessary surplus pages to the buddy allocator */
if (!list_empty(&surplus_list)) {
list_for_each_entry_safe(page, tmp, &surplus_list, lru) {
- list_del(&page->lru);
put_page(page);
}
}
@@ -1909,6 +1910,7 @@ void __init hugetlb_add_hstate(unsigned order)
h->free_huge_pages = 0;
for (i = 0; i < MAX_NUMNODES; ++i)
INIT_LIST_HEAD(&h->hugepage_freelists[i]);
+ INIT_LIST_HEAD(&h->hugepage_activelist);
h->next_nid_to_alloc = first_node(node_states[N_HIGH_MEMORY]);
h->next_nid_to_free = first_node(node_states[N_HIGH_MEMORY]);
snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB",