1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h
index 2eb599465d56..f451fedd1e75 100644
--- a/include/linux/mm_inline.h
+++ b/include/linux/mm_inline.h
@@ -117,4 +117,23 @@ static inline enum lru_list page_lru(struct page *page)
         return lru;
 }
 
+/**
+ * inactive_anon_is_low - check if anonymous pages need to be deactivated
+ * @zone: zone to check
+ *
+ * Returns true if the zone does not have enough inactive anon pages,
+ * meaning some active anon pages need to be deactivated.
+ */
+static inline int inactive_anon_is_low(struct zone *zone)
+{
+        unsigned long active, inactive;
+
+        active = zone_page_state(zone, NR_ACTIVE_ANON);
+        inactive = zone_page_state(zone, NR_INACTIVE_ANON);
+
+        if (inactive * zone->inactive_ratio < active)
+                return 1;
+
+        return 0;
+}
 #endif