1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 5c76737d836b..2aaf72f7e345 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -495,6 +495,10 @@ typedef enum {
         ZONE_CONGESTED,                 /* zone has many dirty pages backed by
                                          * a congested BDI
                                          */
+        ZONE_TAIL_LRU_DIRTY,            /* reclaim scanning has recently found
+                                         * many dirty file pages at the tail
+                                         * of the LRU.
+                                         */
 } zone_flags_t;
 
 static inline void zone_set_flag(struct zone *zone, zone_flags_t flag)
@@ -517,6 +521,11 @@ static inline int zone_is_reclaim_congested(const struct zone *zone)
         return test_bit(ZONE_CONGESTED, &zone->flags);
 }
 
+static inline int zone_is_reclaim_dirty(const struct zone *zone)
+{
+        return test_bit(ZONE_TAIL_LRU_DIRTY, &zone->flags);
+}
+
 static inline int zone_is_reclaim_locked(const struct zone *zone)
 {
         return test_bit(ZONE_RECLAIM_LOCKED, &zone->flags);