blkio: Add io controller stats like

[mv-sheeva.git] / block / blk-cgroup.h

diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index fe445178f586b8705baa8f9391826ffb62ace8ae..5c5e5294b5066b797221570b93c2f2f3640e8c2b 100644 (file)
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -23,6 +23,14 @@ extern struct cgroup_subsys blkio_subsys;
 #define blkio_subsys_id blkio_subsys.subsys_id
 #endif
 
+enum io_type {
+       IO_READ = 0,
+       IO_WRITE,
+       IO_SYNC,
+       IO_ASYNC,
+       IO_TYPE_MAX
+};
+
 struct blkio_cgroup {
        struct cgroup_subsys_state css;
        unsigned int weight;
@@ -30,6 +38,23 @@ struct blkio_cgroup {
        struct hlist_head blkg_list;
 };
 
+struct blkio_group_stats {
+       /* total disk time and nr sectors dispatched by this group */
+       uint64_t time;
+       uint64_t sectors;
+       /* Total disk time used by IOs in ns */
+       uint64_t io_service_time[IO_TYPE_MAX];
+       uint64_t io_service_bytes[IO_TYPE_MAX]; /* Total bytes transferred */
+       /* Total IOs serviced, post merge */
+       uint64_t io_serviced[IO_TYPE_MAX];
+       /* Total time spent waiting in scheduler queue in ns */
+       uint64_t io_wait_time[IO_TYPE_MAX];
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+       /* How many times this group has been removed from service tree */
+       unsigned long dequeue;
+#endif
+};
+
 struct blkio_group {
        /* An rcu protected unique identifier for the group */
        void *key;
@@ -38,15 +63,13 @@ struct blkio_group {
 #ifdef CONFIG_DEBUG_BLK_CGROUP
        /* Store cgroup path */
        char path[128];
-       /* How many times this group has been removed from service tree */
-       unsigned long dequeue;
 #endif
        /* The device MKDEV(major, minor), this group has been created for */
        dev_t   dev;
 
-       /* total disk time and nr sectors dispatched by this group */
-       unsigned long time;
-       unsigned long sectors;
+       /* Need to serialize the stats in the case of reset/update */
+       spinlock_t stats_lock;
+       struct blkio_group_stats stats;
 };
 
 typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);
@@ -105,8 +128,8 @@ extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
 extern int blkiocg_del_blkio_group(struct blkio_group *blkg);
 extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
                                                void *key);
-void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
-                                               unsigned long time);
+void blkiocg_update_timeslice_used(struct blkio_group *blkg,
+                                       unsigned long time);
 #else
 struct cgroup;
 static inline struct blkio_cgroup *
@@ -122,7 +145,7 @@ blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; }
 
 static inline struct blkio_group *
 blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; }
-static inline void blkiocg_update_blkio_group_stats(struct blkio_group *blkg,
+static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
                                                unsigned long time) {}
 #endif
 #endif /* _BLK_CGROUP_H */