[PATCH] mm/hugetlb_cgroup: Add list_del to remove unused page from hugepage_activelist when hugepage migration

[Wanpeng Li <liwp.linux@gmail.com>]

From: Wanpeng Li <liwp@linux.vnet.ibm.com>

hugepage_activelist is used to track currently used HugeTLB pages.
We can find the in-use HugeTLB pages to support HugeTLB cgroup
removal. Don't keep unused page in hugetlb_activelist too long.
Otherwise, on cgroup removal we should update the unused page's 
charge to parent count. To reduce this overhead, remove unused page 
from hugepage_activelist immediately.

Signed-off-by: Wanpeng Li <liwp.linux@gmail.com>
---
 mm/hugetlb_cgroup.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index b834e8d..d819d66 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -398,6 +398,7 @@ 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);
+	list_del(&oldhpage->lru);
 
 	/* move the h_cg details to new cgroup */
 	set_hugetlb_cgroup(newhpage, h_cg);
-- 
1.7.5.4

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