linux-kernel - [PATCH 4/7] hugetlb: add hugepage check in mem_cgroup_{register,end}

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Date:	Fri,  2 Jul 2010 14:47:23 +0900
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	Wu Fengguang <fengguang.wu@...el.com>,
	"Jun'ichi Nomura" <j-nomura@...jp.nec.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/7] hugetlb: add hugepage check in mem_cgroup_{register,end}_migration()

Currently memory cgroup doesn't charge hugepage,
so avoid calling these functions in hugepage migration context.

Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@...jp.nec.com>
---
 mm/memcontrol.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git v2.6.35-rc3-hwpoison/mm/memcontrol.c v2.6.35-rc3-hwpoison/mm/memcontrol.c
index c6ece0a..fed32de 100644
--- v2.6.35-rc3-hwpoison/mm/memcontrol.c
+++ v2.6.35-rc3-hwpoison/mm/memcontrol.c
@@ -2504,6 +2504,8 @@ int mem_cgroup_prepare_migration(struct page *page,
 
 	if (mem_cgroup_disabled())
 		return 0;
+	if (PageHuge(page))
+		return 0;
 
 	pc = lookup_page_cgroup(page);
 	lock_page_cgroup(pc);
@@ -2591,6 +2593,9 @@ void mem_cgroup_end_migration(struct mem_cgroup *mem,
 
 	if (!mem)
 		return;
+	if (PageHuge(oldpage))
+		return;
+
 	/* blocks rmdir() */
 	cgroup_exclude_rmdir(&mem->css);
 	/* at migration success, oldpage->mapping is NULL. */
-- 
1.7.1

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