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authorHugh Dickins <hugh.dickins@tiscali.co.uk>2009-11-09 15:58:23 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-11-09 09:55:44 -0800
commitd178f27fc5150d680d9df865ea9dfe3269cf00a6 (patch)
treec2e87a755ce78765a8dd7752d7608c57ace29bec /mm
parentb7b69c7e97bc0a6694e7052a200609fd48baafc2 (diff)
downloadlwn-d178f27fc5150d680d9df865ea9dfe3269cf00a6.tar.gz
lwn-d178f27fc5150d680d9df865ea9dfe3269cf00a6.zip
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 <hugh.dickins@tiscali.co.uk> Acked-by: Izik Eidus <ieidus@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/ksm.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/ksm.c b/mm/ksm.c
index bef1af4f77e3..5575f8628fef 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1012,6 +1012,7 @@ static struct rmap_item *unstable_tree_search_insert(struct page *page,
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])