aboutsummaryrefslogtreecommitdiffstats
path: root/block/blk-cgroup.h
diff options
context:
space:
mode:
Diffstat (limited to 'block/blk-cgroup.h')
-rw-r--r--block/blk-cgroup.h178
1 files changed, 153 insertions, 25 deletions
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 8ccc20464da..2b866ec1dce 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -23,11 +23,84 @@ extern struct cgroup_subsys blkio_subsys;
#define blkio_subsys_id blkio_subsys.subsys_id
#endif
+enum stat_type {
+ /* Total time spent (in ns) between request dispatch to the driver and
+ * request completion for IOs doen by this cgroup. This may not be
+ * accurate when NCQ is turned on. */
+ BLKIO_STAT_SERVICE_TIME = 0,
+ /* Total bytes transferred */
+ BLKIO_STAT_SERVICE_BYTES,
+ /* Total IOs serviced, post merge */
+ BLKIO_STAT_SERVICED,
+ /* Total time spent waiting in scheduler queue in ns */
+ BLKIO_STAT_WAIT_TIME,
+ /* Number of IOs merged */
+ BLKIO_STAT_MERGED,
+ /* Number of IOs queued up */
+ BLKIO_STAT_QUEUED,
+ /* All the single valued stats go below this */
+ BLKIO_STAT_TIME,
+ BLKIO_STAT_SECTORS,
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ BLKIO_STAT_AVG_QUEUE_SIZE,
+ BLKIO_STAT_IDLE_TIME,
+ BLKIO_STAT_EMPTY_TIME,
+ BLKIO_STAT_GROUP_WAIT_TIME,
+ BLKIO_STAT_DEQUEUE
+#endif
+};
+
+enum stat_sub_type {
+ BLKIO_STAT_READ = 0,
+ BLKIO_STAT_WRITE,
+ BLKIO_STAT_SYNC,
+ BLKIO_STAT_ASYNC,
+ BLKIO_STAT_TOTAL
+};
+
+/* blkg state flags */
+enum blkg_state_flags {
+ BLKG_waiting = 0,
+ BLKG_idling,
+ BLKG_empty,
+};
+
struct blkio_cgroup {
struct cgroup_subsys_state css;
unsigned int weight;
spinlock_t lock;
struct hlist_head blkg_list;
+ struct list_head policy_list; /* list of blkio_policy_node */
+};
+
+struct blkio_group_stats {
+ /* total disk time and nr sectors dispatched by this group */
+ uint64_t time;
+ uint64_t sectors;
+ uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL];
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ /* Sum of number of IOs queued across all samples */
+ uint64_t avg_queue_size_sum;
+ /* Count of samples taken for average */
+ uint64_t avg_queue_size_samples;
+ /* How many times this group has been removed from service tree */
+ unsigned long dequeue;
+
+ /* Total time spent waiting for it to be assigned a timeslice. */
+ uint64_t group_wait_time;
+ uint64_t start_group_wait_time;
+
+ /* Time spent idling for this blkio_group */
+ uint64_t idle_time;
+ uint64_t start_idle_time;
+ /*
+ * Total time when we have requests queued and do not contain the
+ * current active queue.
+ */
+ uint64_t empty_time;
+ uint64_t start_empty_time;
+ uint16_t flags;
+#endif
};
struct blkio_group {
@@ -35,20 +108,25 @@ struct blkio_group {
void *key;
struct hlist_node blkcg_node;
unsigned short blkcg_id;
-#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;
+ 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;
};
+struct blkio_policy_node {
+ struct list_head node;
+ dev_t dev;
+ unsigned int weight;
+};
+
+extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg,
+ dev_t dev);
+
typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg);
typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg,
unsigned int weight);
@@ -67,6 +145,11 @@ struct blkio_policy_type {
extern void blkio_policy_register(struct blkio_policy_type *);
extern void blkio_policy_unregister(struct blkio_policy_type *);
+static inline char *blkg_path(struct blkio_group *blkg)
+{
+ return blkg->path;
+}
+
#else
struct blkio_group {
@@ -78,6 +161,8 @@ struct blkio_policy_type {
static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { }
static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
+static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
+
#endif
#define BLKIO_WEIGHT_MIN 100
@@ -85,16 +170,42 @@ static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { }
#define BLKIO_WEIGHT_DEFAULT 500
#ifdef CONFIG_DEBUG_BLK_CGROUP
-static inline char *blkg_path(struct blkio_group *blkg)
-{
- return blkg->path;
-}
-void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
+void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg);
+void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
unsigned long dequeue);
+void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg);
+void blkiocg_update_idle_time_stats(struct blkio_group *blkg);
+void blkiocg_set_start_empty_time(struct blkio_group *blkg);
+
+#define BLKG_FLAG_FNS(name) \
+static inline void blkio_mark_blkg_##name( \
+ struct blkio_group_stats *stats) \
+{ \
+ stats->flags |= (1 << BLKG_##name); \
+} \
+static inline void blkio_clear_blkg_##name( \
+ struct blkio_group_stats *stats) \
+{ \
+ stats->flags &= ~(1 << BLKG_##name); \
+} \
+static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \
+{ \
+ return (stats->flags & (1 << BLKG_##name)) != 0; \
+} \
+
+BLKG_FLAG_FNS(waiting)
+BLKG_FLAG_FNS(idling)
+BLKG_FLAG_FNS(empty)
+#undef BLKG_FLAG_FNS
#else
-static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
-static inline void blkiocg_update_blkio_group_dequeue_stats(
- struct blkio_group *blkg, unsigned long dequeue) {}
+static inline void blkiocg_update_avg_queue_size_stats(
+ struct blkio_group *blkg) {}
+static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
+ unsigned long dequeue) {}
+static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
+{}
+static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {}
+static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
#endif
#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
@@ -105,26 +216,43 @@ 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, unsigned long sectors);
+void blkiocg_update_timeslice_used(struct blkio_group *blkg,
+ unsigned long time);
+void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes,
+ bool direction, bool sync);
+void blkiocg_update_completion_stats(struct blkio_group *blkg,
+ uint64_t start_time, uint64_t io_start_time, bool direction, bool sync);
+void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction,
+ bool sync);
+void blkiocg_update_io_add_stats(struct blkio_group *blkg,
+ struct blkio_group *curr_blkg, bool direction, bool sync);
+void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
+ bool direction, bool sync);
#else
struct cgroup;
static inline struct blkio_cgroup *
cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; }
static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
- struct blkio_group *blkg, void *key, dev_t dev)
-{
-}
+ struct blkio_group *blkg, void *key, dev_t dev) {}
static inline int
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,
- unsigned long time, unsigned long sectors)
-{
-}
+static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
+ unsigned long time) {}
+static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
+ uint64_t bytes, bool direction, bool sync) {}
+static inline void blkiocg_update_completion_stats(struct blkio_group *blkg,
+ uint64_t start_time, uint64_t io_start_time, bool direction,
+ bool sync) {}
+static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg,
+ bool direction, bool sync) {}
+static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg,
+ struct blkio_group *curr_blkg, bool direction, bool sync) {}
+static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg,
+ bool direction, bool sync) {}
#endif
#endif /* _BLK_CGROUP_H */