linux-kernel - [PATCH 3.8 021/121] mm/hugetlb.c: add cond_resched_lock() in return_unused_surplus

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Message-Id: <1403021714-16320-22-git-send-email-kamal@canonical.com>
Date:	Tue, 17 Jun 2014 09:13:34 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Masayoshi Mizuma <m.mizuma@...fujitsu.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Michal Hocko <mhocko@...e.cz>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 021/121] mm/hugetlb.c: add cond_resched_lock() in return_unused_surplus_pages()

3.8.13.24 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Mizuma, Masayoshi" <m.mizuma@...fujitsu.com>

commit 7848a4bf51b34f41fcc9bd77e837126d99ae84e3 upstream.

soft lockup in freeing gigantic hugepage fixed in commit 55f67141a892 "mm:
hugetlb: fix softlockup when a large number of hugepages are freed." can
happen in return_unused_surplus_pages(), so let's fix it.

Signed-off-by: Masayoshi Mizuma <m.mizuma@...fujitsu.com>
Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@....com>
Cc: Michal Hocko <mhocko@...e.cz>
Cc: Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 mm/hugetlb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index db8bc0a..35fc5eb 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1076,6 +1076,7 @@ static void return_unused_surplus_pages(struct hstate *h,
 	while (nr_pages--) {
 		if (!free_pool_huge_page(h, &node_states[N_MEMORY], 1))
 			break;
+		cond_resched_lock(&hugetlb_lock);
 	}
 }
 
-- 
1.9.1

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