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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2012-07-31 16:42:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 18:42:41 -0700
commit75754681fe79b84dde1048470a44eeb64192fad6 (patch)
tree70951e240cf1f5f6e7e9b6cb8c0626f3b5ffcfba /mm/hugetlb_cgroup.c
parent94ae8ba7176666d1e7d8bbb9f93670a27540b6a8 (diff)
downloadlinux-75754681fe79b84dde1048470a44eeb64192fad6.tar.gz
hugetlb/cgroup: remove exclude and wakeup rmdir calls from migrate
We already hold the hugetlb_lock. That should prevent a parallel cgroup rmdir from touching page's hugetlb cgroup. So remove the exclude and wakeup calls. 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>
Diffstat (limited to 'mm/hugetlb_cgroup.c')
-rw-r--r--mm/hugetlb_cgroup.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index 9834a01c79d..a3f358fb8a0 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -385,6 +385,10 @@ int __init hugetlb_cgroup_file_init(int idx)
return 0;
}
+/*
+ * hugetlb_lock will make sure a parallel cgroup rmdir won't happen
+ * when we migrate hugepages
+ */
void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
{
struct hugetlb_cgroup *h_cg;
@@ -397,13 +401,11 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
spin_lock(&hugetlb_lock);
h_cg = hugetlb_cgroup_from_page(oldhpage);
set_hugetlb_cgroup(oldhpage, NULL);
- cgroup_exclude_rmdir(&h_cg->css);
/* 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;
}