From: z00281421 <z00281421@xxxxxxxxxxxxxxxxxxxx>
more mapcount page as kpage could reduce total replacement
times than fewer mapcount one when ksmd scan and replace
among forked pages later.
Signed-off-by: z00281421 <z00281421@xxxxxxxxxxxxxxxxxxxx>
---
mm/ksm.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/mm/ksm.c b/mm/ksm.c
index 4786b41..17a238c 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1094,6 +1094,21 @@ static struct page *try_to_merge_two_pages(struct rmap_item *rmap_item,
{
int err;
+ /*
+ * select more mapcount page as kpage
+ */
+ if (page_mapcount(page) < page_mapcount(tree_page)) {
+ struct page *tmp_page;
+ struct rmap_item *tmp_rmap_item;
+
+ tmp_page = page;
+ page = tree_page;
+ tree_page = tmp_page;
+ tmp_rmap_item = rmap_item;
+ rmap_item = tree_rmap_item;
+ tree_rmap_item = tmp_rmap_item;
+ }
+
err = try_to_merge_with_ksm_page(rmap_item, page, NULL);
if (!err) {
err = try_to_merge_with_ksm_page(tree_rmap_item,
--
1.7.9.5
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