aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--block/blk-cgroup.c178
-rw-r--r--block/blk-cgroup.h39
-rw-r--r--block/cfq-iosched.c2
3 files changed, 194 insertions, 25 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 5be39813fc9..ad6843f2e0a 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -55,12 +55,15 @@ struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
}
EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup);
-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)
{
- blkg->time += time;
+ unsigned long flags;
+
+ spin_lock_irqsave(&blkg->stats_lock, flags);
+ blkg->stats.time += time;
+ spin_unlock_irqrestore(&blkg->stats_lock, flags);
}
-EXPORT_SYMBOL_GPL(blkiocg_update_blkio_group_stats);
+EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used);
void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
struct blkio_group *blkg, void *key, dev_t dev)
@@ -170,13 +173,121 @@ blkiocg_weight_write(struct cgroup *cgroup, struct cftype *cftype, u64 val)
return 0;
}
-#define SHOW_FUNCTION_PER_GROUP(__VAR) \
+static int
+blkiocg_reset_write(struct cgroup *cgroup, struct cftype *cftype, u64 val)
+{
+ struct blkio_cgroup *blkcg;
+ struct blkio_group *blkg;
+ struct hlist_node *n;
+ struct blkio_group_stats *stats;
+
+ blkcg = cgroup_to_blkio_cgroup(cgroup);
+ spin_lock_irq(&blkcg->lock);
+ hlist_for_each_entry(blkg, n, &blkcg->blkg_list, blkcg_node) {
+ spin_lock(&blkg->stats_lock);
+ stats = &blkg->stats;
+ memset(stats, 0, sizeof(struct blkio_group_stats));
+ spin_unlock(&blkg->stats_lock);
+ }
+ spin_unlock_irq(&blkcg->lock);
+ return 0;
+}
+
+void get_key_name(int type, char *disk_id, char *str, int chars_left)
+{
+ strlcpy(str, disk_id, chars_left);
+ chars_left -= strlen(str);
+ if (chars_left <= 0) {
+ printk(KERN_WARNING
+ "Possibly incorrect cgroup stat display format");
+ return;
+ }
+ switch (type) {
+ case IO_READ:
+ strlcat(str, " Read", chars_left);
+ break;
+ case IO_WRITE:
+ strlcat(str, " Write", chars_left);
+ break;
+ case IO_SYNC:
+ strlcat(str, " Sync", chars_left);
+ break;
+ case IO_ASYNC:
+ strlcat(str, " Async", chars_left);
+ break;
+ case IO_TYPE_MAX:
+ strlcat(str, " Total", chars_left);
+ break;
+ default:
+ strlcat(str, " Invalid", chars_left);
+ }
+}
+
+typedef uint64_t (get_var) (struct blkio_group *, int);
+
+#define MAX_KEY_LEN 100
+uint64_t get_typed_stat(struct blkio_group *blkg, struct cgroup_map_cb *cb,
+ get_var *getvar, char *disk_id)
+{
+ uint64_t disk_total;
+ char key_str[MAX_KEY_LEN];
+ int type;
+
+ for (type = 0; type < IO_TYPE_MAX; type++) {
+ get_key_name(type, disk_id, key_str, MAX_KEY_LEN);
+ cb->fill(cb, key_str, getvar(blkg, type));
+ }
+ disk_total = getvar(blkg, IO_READ) + getvar(blkg, IO_WRITE);
+ get_key_name(IO_TYPE_MAX, disk_id, key_str, MAX_KEY_LEN);
+ cb->fill(cb, key_str, disk_total);
+ return disk_total;
+}
+
+uint64_t get_stat(struct blkio_group *blkg, struct cgroup_map_cb *cb,
+ get_var *getvar, char *disk_id)
+{
+ uint64_t var = getvar(blkg, 0);
+ cb->fill(cb, disk_id, var);
+ return var;
+}
+
+#define GET_STAT_INDEXED(__VAR) \
+uint64_t get_##__VAR##_stat(struct blkio_group *blkg, int type) \
+{ \
+ return blkg->stats.__VAR[type]; \
+} \
+
+GET_STAT_INDEXED(io_service_bytes);
+GET_STAT_INDEXED(io_serviced);
+GET_STAT_INDEXED(io_service_time);
+GET_STAT_INDEXED(io_wait_time);
+#undef GET_STAT_INDEXED
+
+#define GET_STAT(__VAR, __CONV) \
+uint64_t get_##__VAR##_stat(struct blkio_group *blkg, int dummy) \
+{ \
+ uint64_t data = blkg->stats.__VAR; \
+ if (__CONV) \
+ data = (uint64_t)jiffies_to_msecs(data) * NSEC_PER_MSEC;\
+ return data; \
+}
+
+GET_STAT(time, 1);
+GET_STAT(sectors, 0);
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+GET_STAT(dequeue, 0);
+#endif
+#undef GET_STAT
+
+#define SHOW_FUNCTION_PER_GROUP(__VAR, get_stats, getvar, show_total) \
static int blkiocg_##__VAR##_read(struct cgroup *cgroup, \
- struct cftype *cftype, struct seq_file *m) \
+ struct cftype *cftype, struct cgroup_map_cb *cb) \
{ \
struct blkio_cgroup *blkcg; \
struct blkio_group *blkg; \
struct hlist_node *n; \
+ uint64_t cgroup_total = 0; \
+ char disk_id[10]; \
\
if (!cgroup_lock_live_group(cgroup)) \
return -ENODEV; \
@@ -184,19 +295,32 @@ static int blkiocg_##__VAR##_read(struct cgroup *cgroup, \
blkcg = cgroup_to_blkio_cgroup(cgroup); \
rcu_read_lock(); \
hlist_for_each_entry_rcu(blkg, n, &blkcg->blkg_list, blkcg_node) {\
- if (blkg->dev) \
- seq_printf(m, "%u:%u %lu\n", MAJOR(blkg->dev), \
- MINOR(blkg->dev), blkg->__VAR); \
+ if (blkg->dev) { \
+ spin_lock_irq(&blkg->stats_lock); \
+ snprintf(disk_id, 10, "%u:%u", MAJOR(blkg->dev),\
+ MINOR(blkg->dev)); \
+ cgroup_total += get_stats(blkg, cb, getvar, \
+ disk_id); \
+ spin_unlock_irq(&blkg->stats_lock); \
+ } \
} \
+ if (show_total) \
+ cb->fill(cb, "Total", cgroup_total); \
rcu_read_unlock(); \
cgroup_unlock(); \
return 0; \
}
-SHOW_FUNCTION_PER_GROUP(time);
-SHOW_FUNCTION_PER_GROUP(sectors);
+SHOW_FUNCTION_PER_GROUP(time, get_stat, get_time_stat, 0);
+SHOW_FUNCTION_PER_GROUP(sectors, get_stat, get_sectors_stat, 0);
+SHOW_FUNCTION_PER_GROUP(io_service_bytes, get_typed_stat,
+ get_io_service_bytes_stat, 1);
+SHOW_FUNCTION_PER_GROUP(io_serviced, get_typed_stat, get_io_serviced_stat, 1);
+SHOW_FUNCTION_PER_GROUP(io_service_time, get_typed_stat,
+ get_io_service_time_stat, 1);
+SHOW_FUNCTION_PER_GROUP(io_wait_time, get_typed_stat, get_io_wait_time_stat, 1);
#ifdef CONFIG_DEBUG_BLK_CGROUP
-SHOW_FUNCTION_PER_GROUP(dequeue);
+SHOW_FUNCTION_PER_GROUP(dequeue, get_stat, get_dequeue_stat, 0);
#endif
#undef SHOW_FUNCTION_PER_GROUP
@@ -204,7 +328,7 @@ SHOW_FUNCTION_PER_GROUP(dequeue);
void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
unsigned long dequeue)
{
- blkg->dequeue += dequeue;
+ blkg->stats.dequeue += dequeue;
}
EXPORT_SYMBOL_GPL(blkiocg_update_blkio_group_dequeue_stats);
#endif
@@ -217,16 +341,38 @@ struct cftype blkio_files[] = {
},
{
.name = "time",
- .read_seq_string = blkiocg_time_read,
+ .read_map = blkiocg_time_read,
+ .write_u64 = blkiocg_reset_write,
},
{
.name = "sectors",
- .read_seq_string = blkiocg_sectors_read,
+ .read_map = blkiocg_sectors_read,
+ .write_u64 = blkiocg_reset_write,
+ },
+ {
+ .name = "io_service_bytes",
+ .read_map = blkiocg_io_service_bytes_read,
+ .write_u64 = blkiocg_reset_write,
+ },
+ {
+ .name = "io_serviced",
+ .read_map = blkiocg_io_serviced_read,
+ .write_u64 = blkiocg_reset_write,
+ },
+ {
+ .name = "io_service_time",
+ .read_map = blkiocg_io_service_time_read,
+ .write_u64 = blkiocg_reset_write,
+ },
+ {
+ .name = "io_wait_time",
+ .read_map = blkiocg_io_wait_time_read,
+ .write_u64 = blkiocg_reset_write,
},
#ifdef CONFIG_DEBUG_BLK_CGROUP
{
.name = "dequeue",
- .read_seq_string = blkiocg_dequeue_read,
+ .read_map = blkiocg_dequeue_read,
},
#endif
};
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index fe445178f58..5c5e5294b50 100644
--- 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 */
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 7471d36bce8..c5161bbf2fe 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -915,7 +915,7 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg,
cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime,
st->min_vdisktime);
- blkiocg_update_blkio_group_stats(&cfqg->blkg, used_sl);
+ blkiocg_update_timeslice_used(&cfqg->blkg, used_sl);
}
#ifdef CONFIG_CFQ_GROUP_IOSCHED