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Subject[RFC v5 PATCH 6/8] sched: Add throttle time statistics to /proc/sched_debug
sched: Add throttle time statistics to /proc/sched_debug

From: Bharata B Rao <bharata@linux.vnet.ibm.com>

With hard limits, provide stats about throttle time, throttle count
and max throttle time for group sched entities in /proc/sched_debug
Throttle stats are collected only for group entities.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
---
include/linux/sched.h | 6 ++++++
kernel/sched_debug.c | 17 ++++++++++++++++-
kernel/sched_fair.c | 20 ++++++++++++++++++++
3 files changed, 42 insertions(+), 1 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index f2f842d..025a594 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1191,6 +1191,12 @@ struct sched_entity {
u64 nr_wakeups_affine_attempts;
u64 nr_wakeups_passive;
u64 nr_wakeups_idle;
+#ifdef CONFIG_CFS_HARD_LIMITS
+ u64 throttle_start;
+ u64 throttle_max;
+ u64 throttle_count;
+ u64 throttle_sum;
+#endif
#endif

#ifdef CONFIG_FAIR_GROUP_SCHED
diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c
index 1b67698..c833aa2 100644
--- a/kernel/sched_debug.c
+++ b/kernel/sched_debug.c
@@ -80,6 +80,11 @@ static void print_cfs_group_stats(struct seq_file *m, int cpu,
PN(se->wait_max);
PN(se->wait_sum);
P(se->wait_count);
+#ifdef CONFIG_CFS_HARD_LIMITS
+ PN(se->throttle_max);
+ PN(se->throttle_sum);
+ P(se->throttle_count);
+#endif
#endif
P(se->load.weight);
#undef PN
@@ -214,6 +219,16 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
#ifdef CONFIG_SMP
SEQ_printf(m, " .%-30s: %lu\n", "shares", cfs_rq->shares);
#endif
+#ifdef CONFIG_CFS_HARD_LIMITS
+ raw_spin_lock_irqsave(&rq->lock, flags);
+ SEQ_printf(m, " .%-30s: %d\n", "rq_bandwidth.throttled",
+ cfs_rq->rq_bandwidth.throttled);
+ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "rq_bandwidth.time",
+ SPLIT_NS(cfs_rq->rq_bandwidth.time));
+ SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "rq_bandwidth.runtime",
+ SPLIT_NS(cfs_rq->rq_bandwidth.runtime));
+ raw_spin_unlock_irqrestore(&rq->lock, flags);
+#endif /* CONFIG_CFS_HARD_LIMITS */
print_cfs_group_stats(m, cpu, cfs_rq->tg);
#endif
}
@@ -320,7 +335,7 @@ static int sched_debug_show(struct seq_file *m, void *v)
u64 now = ktime_to_ns(ktime_get());
int cpu;

- SEQ_printf(m, "Sched Debug Version: v0.09, %s %.*s\n",
+ SEQ_printf(m, "Sched Debug Version: v0.10, %s %.*s\n",
init_utsname()->release,
(int)strcspn(init_utsname()->version, " "),
init_utsname()->version);
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index f791332..16ed209 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -219,6 +219,23 @@ static inline void start_cfs_bandwidth(struct cfs_rq *cfs_rq)

#ifdef CONFIG_CFS_HARD_LIMITS

+static inline void update_stats_throttle_start(struct cfs_rq *cfs_rq,
+ struct sched_entity *se)
+{
+ schedstat_set(se->throttle_start, rq_of(cfs_rq)->clock);
+}
+
+static inline void update_stats_throttle_end(struct cfs_rq *cfs_rq,
+ struct sched_entity *se)
+{
+ schedstat_set(se->throttle_max, max(se->throttle_max,
+ rq_of(cfs_rq)->clock - se->throttle_start));
+ schedstat_set(se->throttle_count, se->throttle_count + 1);
+ schedstat_set(se->throttle_sum, se->throttle_sum +
+ rq_of(cfs_rq)->clock - se->throttle_start);
+ schedstat_set(se->throttle_start, 0);
+}
+
static inline int cfs_rq_throttled(struct cfs_rq *cfs_rq)
{
return cfs_rq->rq_bandwidth.throttled;
@@ -245,6 +262,7 @@ static void sched_cfs_runtime_exceeded(struct sched_entity *se,

if (cfs_rq->rq_bandwidth.time > cfs_rq->rq_bandwidth.runtime) {
cfs_rq->rq_bandwidth.throttled = 1;
+ update_stats_throttle_start(cfs_rq, se);
resched_task(tsk_curr);
}
}
@@ -300,6 +318,8 @@ static int do_sched_cfs_period_timer(struct sched_bandwidth *cfs_b, int overrun)
if (cfs_rq_throttled(cfs_rq) &&
cfs_rq->rq_bandwidth.time < runtime) {
cfs_rq->rq_bandwidth.throttled = 0;
+ update_rq_clock(rq);
+ update_stats_throttle_end(cfs_rq, se);
enqueue = 1;
}
if (cfs_rq->rq_bandwidth.time || cfs_rq->nr_running)

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