linux-kernel - [PATCH -V3 4/4] hugetlb/cgroup: Remove exclude and wakeup rmdir calls from migrate

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Message-Id: <1339764082-1611-5-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
Date:	Fri, 15 Jun 2012 18:11:22 +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,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Subject: [PATCH -V3 4/4] hugetlb/cgroup: Remove exclude and wakeup rmdir calls from migrate

From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>

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@...ux.vnet.ibm.com>
---
 mm/hugetlb_cgroup.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index 55e109a..a7a0a79 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -387,6 +387,10 @@ 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;
@@ -399,13 +403,11 @@ 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;
 }
 
-- 
1.7.10

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