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Date:	Mon, 9 Nov 2009 15:58:23 +0000 (GMT)
From:	Hugh Dickins <>
To:	Linus Torvalds <>
cc:	Andrew Morton <>,
	Izik Eidus <>,
	Andrea Arcangeli <>,
Subject: [PATCH] ksm: cond_resched in unstable tree

KSM needs a cond_resched() for CONFIG_PREEMPT_NONE, in its unbounded
search of the unstable tree.  The stable tree cases already have one,
and originally there was one down inside get_user_pages();
but I missed it when I converted to follow_page() instead.

Signed-off-by: Hugh Dickins <>

 mm/ksm.c |    1 +
 1 file changed, 1 insertion(+)

--- 2.6.32-rc6/mm/ksm.c	2009-10-12 00:26:43.000000000 +0100
+++ linux/mm/ksm.c	2009-11-07 14:44:58.000000000 +0000
@@ -1012,6 +1012,7 @@ static struct rmap_item *unstable_tree_s
 		struct rmap_item *tree_rmap_item;
 		int ret;
+		cond_resched();
 		tree_rmap_item = rb_entry(*new, struct rmap_item, node);
 		page2[0] = get_mergeable_page(tree_rmap_item);
 		if (!page2[0])
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