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-rw-r--r--block/blk-cgroup.c159
-rw-r--r--block/blk-cgroup.h54
-rw-r--r--block/cfq-iosched.c50
3 files changed, 242 insertions, 21 deletions
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 1e0c497..1ecff7a 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -105,6 +105,76 @@ static void blkio_check_and_dec_stat(uint64_t *stat, bool direction, bool sync)
}
#ifdef CONFIG_DEBUG_BLK_CGROUP
+/* This should be called with the blkg->stats_lock held. */
+static void blkio_set_start_group_wait_time(struct blkio_group *blkg,
+ struct blkio_group *curr_blkg)
+{
+ if (blkio_blkg_waiting(&blkg->stats))
+ return;
+ if (blkg == curr_blkg)
+ return;
+ blkg->stats.start_group_wait_time = sched_clock();
+ blkio_mark_blkg_waiting(&blkg->stats);
+}
+
+/* This should be called with the blkg->stats_lock held. */
+static void blkio_update_group_wait_time(struct blkio_group_stats *stats)
+{
+ unsigned long long now;
+
+ if (!blkio_blkg_waiting(stats))
+ return;
+
+ now = sched_clock();
+ if (time_after64(now, stats->start_group_wait_time))
+ stats->group_wait_time += now - stats->start_group_wait_time;
+ blkio_clear_blkg_waiting(stats);
+}
+
+/* This should be called with the blkg->stats_lock held. */
+static void blkio_end_empty_time(struct blkio_group_stats *stats)
+{
+ unsigned long long now;
+
+ if (!blkio_blkg_empty(stats))
+ return;
+
+ now = sched_clock();
+ if (time_after64(now, stats->start_empty_time))
+ stats->empty_time += now - stats->start_empty_time;
+ blkio_clear_blkg_empty(stats);
+}
+
+void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&blkg->stats_lock, flags);
+ BUG_ON(blkio_blkg_idling(&blkg->stats));
+ blkg->stats.start_idle_time = sched_clock();
+ blkio_mark_blkg_idling(&blkg->stats);
+ spin_unlock_irqrestore(&blkg->stats_lock, flags);
+}
+EXPORT_SYMBOL_GPL(blkiocg_update_set_idle_time_stats);
+
+void blkiocg_update_idle_time_stats(struct blkio_group *blkg)
+{
+ unsigned long flags;
+ unsigned long long now;
+ struct blkio_group_stats *stats;
+
+ spin_lock_irqsave(&blkg->stats_lock, flags);
+ stats = &blkg->stats;
+ if (blkio_blkg_idling(stats)) {
+ now = sched_clock();
+ if (time_after64(now, stats->start_idle_time))
+ stats->idle_time += now - stats->start_idle_time;
+ blkio_clear_blkg_idling(stats);
+ }
+ spin_unlock_irqrestore(&blkg->stats_lock, flags);
+}
+EXPORT_SYMBOL_GPL(blkiocg_update_idle_time_stats);
+
void blkiocg_update_set_active_queue_stats(struct blkio_group *blkg)
{
unsigned long flags;
@@ -116,9 +186,14 @@ void blkiocg_update_set_active_queue_stats(struct blkio_group *blkg)
stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] +
stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE];
stats->avg_queue_size_samples++;
+ blkio_update_group_wait_time(stats);
spin_unlock_irqrestore(&blkg->stats_lock, flags);
}
EXPORT_SYMBOL_GPL(blkiocg_update_set_active_queue_stats);
+#else
+static inline void blkio_set_start_group_wait_time(struct blkio_group *blkg,
+ struct blkio_group *curr_blkg) {}
+static inline void blkio_end_empty_time(struct blkio_group_stats *stats) {}
#endif
void blkiocg_update_request_add_stats(struct blkio_group *blkg,
@@ -130,6 +205,8 @@ void blkiocg_update_request_add_stats(struct blkio_group *blkg,
spin_lock_irqsave(&blkg->stats_lock, flags);
blkio_add_stat(blkg->stats.stat_arr[BLKIO_STAT_QUEUED], 1, direction,
sync);
+ blkio_end_empty_time(&blkg->stats);
+ blkio_set_start_group_wait_time(blkg, curr_blkg);
spin_unlock_irqrestore(&blkg->stats_lock, flags);
}
EXPORT_SYMBOL_GPL(blkiocg_update_request_add_stats);
@@ -156,6 +233,33 @@ void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time)
}
EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used);
+void blkiocg_set_start_empty_time(struct blkio_group *blkg, bool ignore)
+{
+ unsigned long flags;
+ struct blkio_group_stats *stats;
+
+ spin_lock_irqsave(&blkg->stats_lock, flags);
+ stats = &blkg->stats;
+
+ if (stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_READ] ||
+ stats->stat_arr[BLKIO_STAT_QUEUED][BLKIO_STAT_WRITE]) {
+ spin_unlock_irqrestore(&blkg->stats_lock, flags);
+ return;
+ }
+
+ /*
+ * If ignore is set, we do not panic on the empty flag being set
+ * already. This is to avoid cases where there are superfluous timeslice
+ * complete events (for eg., forced_dispatch in CFQ) when no IOs are
+ * served which could result in triggering the empty check incorrectly.
+ */
+ BUG_ON(!ignore && blkio_blkg_empty(stats));
+ stats->start_empty_time = sched_clock();
+ blkio_mark_blkg_empty(stats);
+ spin_unlock_irqrestore(&blkg->stats_lock, flags);
+}
+EXPORT_SYMBOL_GPL(blkiocg_set_start_empty_time);
+
void blkiocg_update_dispatch_stats(struct blkio_group *blkg,
uint64_t bytes, bool direction, bool sync)
{
@@ -317,19 +421,44 @@ blkiocg_reset_stats(struct cgroup *cgroup, struct cftype *cftype, u64 val)
{
struct blkio_cgroup *blkcg;
struct blkio_group *blkg;
+ struct blkio_group_stats *stats;
struct hlist_node *n;
uint64_t queued[BLKIO_STAT_TOTAL];
int i;
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ bool idling, waiting, empty;
+ unsigned long long now = sched_clock();
+#endif
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;
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ idling = blkio_blkg_idling(stats);
+ waiting = blkio_blkg_waiting(stats);
+ empty = blkio_blkg_empty(stats);
+#endif
for (i = 0; i < BLKIO_STAT_TOTAL; i++)
- queued[i] = blkg->stats.stat_arr[BLKIO_STAT_QUEUED][i];
- memset(&blkg->stats, 0, sizeof(struct blkio_group_stats));
+ queued[i] = stats->stat_arr[BLKIO_STAT_QUEUED][i];
+ memset(stats, 0, sizeof(struct blkio_group_stats));
for (i = 0; i < BLKIO_STAT_TOTAL; i++)
- blkg->stats.stat_arr[BLKIO_STAT_QUEUED][i] = queued[i];
+ stats->stat_arr[BLKIO_STAT_QUEUED][i] = queued[i];
+#ifdef CONFIG_DEBUG_BLK_CGROUP
+ if (idling) {
+ blkio_mark_blkg_idling(stats);
+ stats->start_idle_time = now;
+ }
+ if (waiting) {
+ blkio_mark_blkg_waiting(stats);
+ stats->start_group_wait_time = now;
+ }
+ if (empty) {
+ blkio_mark_blkg_empty(stats);
+ stats->start_empty_time = now;
+ }
+#endif
spin_unlock(&blkg->stats_lock);
}
spin_unlock_irq(&blkcg->lock);
@@ -401,6 +530,15 @@ static uint64_t blkio_get_stat(struct blkio_group *blkg,
sum = 0;
return blkio_fill_stat(key_str, MAX_KEY_LEN - 1, sum, cb, dev);
}
+ if (type == BLKIO_STAT_GROUP_WAIT_TIME)
+ return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
+ blkg->stats.group_wait_time, cb, dev);
+ if (type == BLKIO_STAT_IDLE_TIME)
+ return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
+ blkg->stats.idle_time, cb, dev);
+ if (type == BLKIO_STAT_EMPTY_TIME)
+ return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
+ blkg->stats.empty_time, cb, dev);
if (type == BLKIO_STAT_DEQUEUE)
return blkio_fill_stat(key_str, MAX_KEY_LEN - 1,
blkg->stats.dequeue, cb, dev);
@@ -458,6 +596,9 @@ SHOW_FUNCTION_PER_GROUP(io_queued, BLKIO_STAT_QUEUED, 1);
#ifdef CONFIG_DEBUG_BLK_CGROUP
SHOW_FUNCTION_PER_GROUP(dequeue, BLKIO_STAT_DEQUEUE, 0);
SHOW_FUNCTION_PER_GROUP(avg_queue_size, BLKIO_STAT_AVG_QUEUE_SIZE, 0);
+SHOW_FUNCTION_PER_GROUP(group_wait_time, BLKIO_STAT_GROUP_WAIT_TIME, 0);
+SHOW_FUNCTION_PER_GROUP(idle_time, BLKIO_STAT_IDLE_TIME, 0);
+SHOW_FUNCTION_PER_GROUP(empty_time, BLKIO_STAT_EMPTY_TIME, 0);
#endif
#undef SHOW_FUNCTION_PER_GROUP
@@ -518,6 +659,18 @@ struct cftype blkio_files[] = {
.read_map = blkiocg_avg_queue_size_read,
},
{
+ .name = "group_wait_time",
+ .read_map = blkiocg_group_wait_time_read,
+ },
+ {
+ .name = "idle_time",
+ .read_map = blkiocg_idle_time_read,
+ },
+ {
+ .name = "empty_time",
+ .read_map = blkiocg_empty_time_read,
+ },
+ {
.name = "dequeue",
.read_map = blkiocg_dequeue_read,
},
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index bea7f3b..bfce085 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -43,6 +43,9 @@ enum stat_type {
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
};
@@ -55,6 +58,13 @@ enum stat_sub_type {
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;
@@ -74,6 +84,21 @@ struct blkio_group_stats {
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
};
@@ -137,12 +162,41 @@ static inline char *blkg_path(struct blkio_group *blkg)
void blkiocg_update_set_active_queue_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, bool ignore);
+
+#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_set_active_queue_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,
+ bool ignore) {}
#endif
#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 8e0b86a..b6e095c 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -886,7 +886,7 @@ static inline unsigned int cfq_cfqq_slice_usage(struct cfq_queue *cfqq)
}
static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg,
- struct cfq_queue *cfqq)
+ struct cfq_queue *cfqq, bool forced)
{
struct cfq_rb_root *st = &cfqd->grp_service_tree;
unsigned int used_sl, charge_sl;
@@ -916,6 +916,7 @@ 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_timeslice_used(&cfqg->blkg, used_sl);
+ blkiocg_set_start_empty_time(&cfqg->blkg, forced);
}
#ifdef CONFIG_CFQ_GROUP_IOSCHED
@@ -1528,6 +1529,12 @@ static int cfq_allow_merge(struct request_queue *q, struct request *rq,
return cfqq == RQ_CFQQ(rq);
}
+static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq)
+{
+ del_timer(&cfqd->idle_slice_timer);
+ blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg);
+}
+
static void __cfq_set_active_queue(struct cfq_data *cfqd,
struct cfq_queue *cfqq)
{
@@ -1547,7 +1554,7 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd,
cfq_clear_cfqq_fifo_expire(cfqq);
cfq_mark_cfqq_slice_new(cfqq);
- del_timer(&cfqd->idle_slice_timer);
+ cfq_del_timer(cfqd, cfqq);
}
cfqd->active_queue = cfqq;
@@ -1558,12 +1565,12 @@ static void __cfq_set_active_queue(struct cfq_data *cfqd,
*/
static void
__cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
- bool timed_out)
+ bool timed_out, bool forced)
{
cfq_log_cfqq(cfqd, cfqq, "slice expired t=%d", timed_out);
if (cfq_cfqq_wait_request(cfqq))
- del_timer(&cfqd->idle_slice_timer);
+ cfq_del_timer(cfqd, cfqq);
cfq_clear_cfqq_wait_request(cfqq);
cfq_clear_cfqq_wait_busy(cfqq);
@@ -1585,7 +1592,7 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
cfq_log_cfqq(cfqd, cfqq, "resid=%ld", cfqq->slice_resid);
}
- cfq_group_served(cfqd, cfqq->cfqg, cfqq);
+ cfq_group_served(cfqd, cfqq->cfqg, cfqq, forced);
if (cfq_cfqq_on_rr(cfqq) && RB_EMPTY_ROOT(&cfqq->sort_list))
cfq_del_cfqq_rr(cfqd, cfqq);
@@ -1604,12 +1611,13 @@ __cfq_slice_expired(struct cfq_data *cfqd, struct cfq_queue *cfqq,
}
}
-static inline void cfq_slice_expired(struct cfq_data *cfqd, bool timed_out)
+static inline void cfq_slice_expired(struct cfq_data *cfqd, bool timed_out,
+ bool forced)
{
struct cfq_queue *cfqq = cfqd->active_queue;
if (cfqq)
- __cfq_slice_expired(cfqd, cfqq, timed_out);
+ __cfq_slice_expired(cfqd, cfqq, timed_out, forced);
}
/*
@@ -1865,6 +1873,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
sl = cfqd->cfq_slice_idle;
mod_timer(&cfqd->idle_slice_timer, jiffies + sl);
+ blkiocg_update_set_idle_time_stats(&cfqq->cfqg->blkg);
cfq_log_cfqq(cfqd, cfqq, "arm_idle: %lu", sl);
}
@@ -2176,7 +2185,7 @@ static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd)
}
expire:
- cfq_slice_expired(cfqd, 0);
+ cfq_slice_expired(cfqd, 0, false);
new_queue:
/*
* Current queue expired. Check if we have to switch to a new
@@ -2202,7 +2211,7 @@ static int __cfq_forced_dispatch_cfqq(struct cfq_queue *cfqq)
BUG_ON(!list_empty(&cfqq->fifo));
/* By default cfqq is not expired if it is empty. Do it explicitly */
- __cfq_slice_expired(cfqq->cfqd, cfqq, 0);
+ __cfq_slice_expired(cfqq->cfqd, cfqq, 0, true);
return dispatched;
}
@@ -2218,7 +2227,7 @@ static int cfq_forced_dispatch(struct cfq_data *cfqd)
while ((cfqq = cfq_get_next_queue_forced(cfqd)) != NULL)
dispatched += __cfq_forced_dispatch_cfqq(cfqq);
- cfq_slice_expired(cfqd, 0);
+ cfq_slice_expired(cfqd, 0, true);
BUG_ON(cfqd->busy_queues);
cfq_log(cfqd, "forced_dispatch=%d", dispatched);
@@ -2382,10 +2391,15 @@ static int cfq_dispatch_requests(struct request_queue *q, int force)
cfqq->slice_dispatch >= cfq_prio_to_maxrq(cfqd, cfqq)) ||
cfq_class_idle(cfqq))) {
cfqq->slice_end = jiffies + 1;
- cfq_slice_expired(cfqd, 0);
+ cfq_slice_expired(cfqd, 0, false);
}
cfq_log_cfqq(cfqd, cfqq, "dispatched a request");
+ /*
+ * This is needed since we don't exactly match the mod_timer() and
+ * del_timer() calls in CFQ.
+ */
+ blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg);
return 1;
}
@@ -2413,7 +2427,7 @@ static void cfq_put_queue(struct cfq_queue *cfqq)
orig_cfqg = cfqq->orig_cfqg;
if (unlikely(cfqd->active_queue == cfqq)) {
- __cfq_slice_expired(cfqd, cfqq, 0);
+ __cfq_slice_expired(cfqd, cfqq, 0, false);
cfq_schedule_dispatch(cfqd);
}
@@ -2514,7 +2528,7 @@ static void cfq_exit_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq)
struct cfq_queue *__cfqq, *next;
if (unlikely(cfqq == cfqd->active_queue)) {
- __cfq_slice_expired(cfqd, cfqq, 0);
+ __cfq_slice_expired(cfqd, cfqq, 0, false);
cfq_schedule_dispatch(cfqd);
}
@@ -3143,7 +3157,7 @@ cfq_should_preempt(struct cfq_data *cfqd, struct cfq_queue *new_cfqq,
static void cfq_preempt_queue(struct cfq_data *cfqd, struct cfq_queue *cfqq)
{
cfq_log_cfqq(cfqd, cfqq, "preempt");
- cfq_slice_expired(cfqd, 1);
+ cfq_slice_expired(cfqd, 1, false);
/*
* Put the new queue at the front of the of the current list,
@@ -3191,7 +3205,7 @@ cfq_rq_enqueued(struct cfq_data *cfqd, struct cfq_queue *cfqq,
if (cfq_cfqq_wait_request(cfqq)) {
if (blk_rq_bytes(rq) > PAGE_CACHE_SIZE ||
cfqd->busy_queues > 1) {
- del_timer(&cfqd->idle_slice_timer);
+ cfq_del_timer(cfqd, cfqq);
cfq_clear_cfqq_wait_request(cfqq);
__blk_run_queue(cfqd->queue);
} else
@@ -3352,7 +3366,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
* - when there is a close cooperator
*/
if (cfq_slice_used(cfqq) || cfq_class_idle(cfqq))
- cfq_slice_expired(cfqd, 1);
+ cfq_slice_expired(cfqd, 1, false);
else if (sync && cfqq_empty &&
!cfq_close_cooperator(cfqd, cfqq)) {
cfqd->noidle_tree_requires_idle |= !rq_noidle(rq);
@@ -3612,7 +3626,7 @@ static void cfq_idle_slice_timer(unsigned long data)
cfq_clear_cfqq_deep(cfqq);
}
expire:
- cfq_slice_expired(cfqd, timed_out);
+ cfq_slice_expired(cfqd, timed_out, false);
out_kick:
cfq_schedule_dispatch(cfqd);
out_cont:
@@ -3655,7 +3669,7 @@ static void cfq_exit_queue(struct elevator_queue *e)
spin_lock_irq(q->queue_lock);
if (cfqd->active_queue)
- __cfq_slice_expired(cfqd, cfqd->active_queue, 0);
+ __cfq_slice_expired(cfqd, cfqd->active_queue, 0, false);
while (!list_empty(&cfqd->cic_list)) {
struct cfq_io_context *cic = list_entry(cfqd->cic_list.next,
generated by cgit v1.1 at 2024-12-25 09:22:57 +0000