writeback: do not sleep on the congestion queue if there are no congested BDIs or...

[pandora-kernel.git] / include / linux / mmzone.h

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 3984c4e..39c24eb 100644 (file)
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -104,6 +104,8 @@ enum zone_stat_item {
        NR_ISOLATED_ANON,       /* Temporary isolated pages from anon lru */
        NR_ISOLATED_FILE,       /* Temporary isolated pages from file lru */
        NR_SHMEM,               /* shmem pages (included tmpfs/GEM pages) */
+       NR_DIRTIED,             /* page dirtyings since bootup */
+       NR_WRITTEN,             /* page writings since bootup */
 #ifdef CONFIG_NUMA
        NUMA_HIT,               /* allocated in intended node */
        NUMA_MISS,              /* allocated in non intended node */
@@ -421,6 +423,9 @@ struct zone {
 typedef enum {
        ZONE_RECLAIM_LOCKED,            /* prevents concurrent reclaim */
        ZONE_OOM_LOCKED,                /* zone is in OOM killer zonelist */
+       ZONE_CONGESTED,                 /* zone has many dirty pages backed by
+                                        * a congested BDI
+                                        */
 } zone_flags_t;
 
 static inline void zone_set_flag(struct zone *zone, zone_flags_t flag)
@@ -438,6 +443,11 @@ static inline void zone_clear_flag(struct zone *zone, zone_flags_t flag)
        clear_bit(flag, &zone->flags);
 }
 
+static inline int zone_is_reclaim_congested(const struct zone *zone)
+{
+       return test_bit(ZONE_CONGESTED, &zone->flags);
+}
+
 static inline int zone_is_reclaim_locked(const struct zone *zone)
 {
        return test_bit(ZONE_RECLAIM_LOCKED, &zone->flags);