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hugetlb/cgroup: migrate hugetlb cgroup info from oldpage to new page during migration

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With HugeTLB pages, hugetlb cgroup is uncharged in compound page
destructor.  Since we are holding a hugepage reference, we can be sure
that old page won't get uncharged till the last put_page().

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>
Cc: 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 16:42:27 -07:00
committed by Linus Torvalds
parent abb8206cb0
commit 8e6ac7fab3
3 changed files with 33 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
mm/hugetlb_cgroup.c
+20
View File
@@ -386,6 +386,26 @@ int __init hugetlb_cgroup_file_init(int idx)
return 0;
}
void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
{
struct hugetlb_cgroup *h_cg;
if (hugetlb_cgroup_disabled())
return;
VM_BUG_ON(!PageHuge(oldhpage));
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);
spin_unlock(&hugetlb_lock);
cgroup_release_and_wakeup_rmdir(&h_cg->css);
return;
}
struct cgroup_subsys hugetlb_subsys = {
.name = "hugetlb",
.create = hugetlb_cgroup_create,