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Subject[PATCH] mm: trivial mark_page_accessed() cleanup
This avoids duplicated PageReferenced() calls.
No behavior change.

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
mm/swap.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/mm/swap.c b/mm/swap.c
index 38a52b9..c55720c 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -373,9 +373,15 @@ void mark_page_accessed(struct page *page)
page = compound_head(page);
inc_node_page_state(page, NR_ACCESSED);

- if (!PageActive(page) && !PageUnevictable(page) &&
- PageReferenced(page)) {
-
+ if (!PageReferenced(page)) {
+ SetPageReferenced(page);
+ } else if (PageUnevictable(page)) {
+ /*
+ * Unevictable pages are on the "LRU_UNEVICTABLE" list. But,
+ * this list is never rotated or maintained, so marking an
+ * evictable page accessed has no effect.
+ */
+ } else if (!PageActive(page)) {
/*
* If the page is on the LRU, queue it for activation via
* activate_page_pvecs. Otherwise, assume the page is on a
@@ -389,8 +395,6 @@ void mark_page_accessed(struct page *page)
ClearPageReferenced(page);
if (page_is_file_cache(page))
workingset_activation(page);
- } else if (!PageReferenced(page)) {
- SetPageReferenced(page);
}
if (page_is_idle(page))
clear_page_idle(page);
--
2.7.4
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