From 94ae8ba7176666d1e7d8bbb9f93670a27540b6a8 Mon Sep 17 00:00:00 2001
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Date: Tue, 31 Jul 2012 16:42:35 -0700
Subject: [PATCH] hugetlb/cgroup: assign the page hugetlb cgroup when we move
the page to active list.
A page's hugetlb cgroup assignment and movement to the active list should
occur with hugetlb_lock held. Otherwise when we remove the hugetlb cgroup
we will iterate the active list and find pages with NULL hugetlb cgroup
values.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/hugetlb.c | 22 ++++++++++------------
mm/hugetlb_cgroup.c | 5 +++--
2 files changed, 13 insertions(+), 14 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ec7b86ebf9d9..c39e4beeb63a 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -928,14 +928,8 @@ struct page *alloc_huge_page_node(struct hstate *h, int nid)
page = dequeue_huge_page_node(h, nid);
spin_unlock(&hugetlb_lock);
- if (!page) {
+ if (!page)
page = alloc_buddy_huge_page(h, nid);
- if (page) {
- spin_lock(&hugetlb_lock);
- list_move(&page->lru, &h->hugepage_activelist);
- spin_unlock(&hugetlb_lock);
- }
- }
return page;
}
@@ -1150,9 +1144,13 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
}
spin_lock(&hugetlb_lock);
page = dequeue_huge_page_vma(h, vma, addr, avoid_reserve);
- spin_unlock(&hugetlb_lock);
-
- if (!page) {
+ if (page) {
+ /* update page cgroup details */
+ hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h),
+ h_cg, page);
+ spin_unlock(&hugetlb_lock);
+ } else {
+ spin_unlock(&hugetlb_lock);
page = alloc_buddy_huge_page(h, NUMA_NO_NODE);
if (!page) {
hugetlb_cgroup_uncharge_cgroup(idx,
@@ -1162,6 +1160,8 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
return ERR_PTR(-ENOSPC);
}
spin_lock(&hugetlb_lock);
+ hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h),
+ h_cg, page);
list_move(&page->lru, &h->hugepage_activelist);
spin_unlock(&hugetlb_lock);
}
@@ -1169,8 +1169,6 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
set_page_private(page, (unsigned long)spool);
vma_commit_reservation(h, vma, addr);
- /* update page cgroup details */
- hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page);
return page;
}
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index 680e4819e077..9834a01c79dc 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -213,6 +213,7 @@ int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages,
return ret;
}
+/* Should be called with hugetlb_lock held */
void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
struct hugetlb_cgroup *h_cg,
struct page *page)
@@ -220,9 +221,7 @@ void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
if (hugetlb_cgroup_disabled() || !h_cg)
return;
- spin_lock(&hugetlb_lock);
set_hugetlb_cgroup(page, h_cg);
- spin_unlock(&hugetlb_lock);
return;
}
@@ -389,6 +388,7 @@ int __init hugetlb_cgroup_file_init(int idx)
void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
{
struct hugetlb_cgroup *h_cg;
+ struct hstate *h = page_hstate(oldhpage);
if (hugetlb_cgroup_disabled())
return;
@@ -401,6 +401,7 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
/* move the h_cg details to new cgroup */
set_hugetlb_cgroup(newhpage, h_cg);
+ list_move(&newhpage->lru, &h->hugepage_activelist);
spin_unlock(&hugetlb_lock);
cgroup_release_and_wakeup_rmdir(&h_cg->css);
return;
--
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