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Subject[PATCH 3/4] sched/fair: Add cfs bandwidth burst statistics
Date
Introduce statistics exports for the burstable cfs bandwidth
controller.

The following exports are included:

current_bw: current runtime in global pool
nr_burst: number of periods bandwidth burst occurs
burst_time: cumulative wall-time that any cpus has
used above quota in respective periods

Signed-off-by: Huaixin Chang <changhuaixin@linux.alibaba.com>
Signed-off-by: Shanpei Chen <shanpeic@linux.alibaba.com>
---
kernel/sched/core.c | 6 ++++++
kernel/sched/fair.c | 12 +++++++++++-
kernel/sched/sched.h | 3 +++
3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 71cced83df2f..d80a37819d7a 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7986,6 +7986,8 @@ static int tg_set_cfs_bandwidth(struct task_group *tg, u64 period, u64 quota,
cfs_b->runtime = min(max_cfs_runtime, cfs_b->runtime);
}

+ cfs_b->previous_runtime = cfs_b->runtime;
+
/* Restart the period timer (if active) to handle new period expiry: */
if (runtime_enabled)
start_cfs_bandwidth(cfs_b, 1);
@@ -8234,6 +8236,10 @@ static int cpu_cfs_stat_show(struct seq_file *sf, void *v)
seq_printf(sf, "wait_sum %llu\n", ws);
}

+ seq_printf(sf, "current_bw %llu\n", cfs_b->runtime);
+ seq_printf(sf, "nr_burst %d\n", cfs_b->nr_burst);
+ seq_printf(sf, "burst_time %llu\n", cfs_b->burst_time);
+
return 0;
}
#endif /* CONFIG_CFS_BANDWIDTH */
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 38a726f77783..e431b2fff01d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4600,7 +4600,7 @@ static inline u64 sched_cfs_bandwidth_slice(void)
*/
void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b, u64 overrun)
{
- u64 refill;
+ u64 refill, runtime;

if (cfs_b->quota != RUNTIME_INF) {

@@ -4609,10 +4609,20 @@ void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b, u64 overrun)
return;
}

+ if (cfs_b->previous_runtime > cfs_b->runtime) {
+ runtime = cfs_b->previous_runtime - cfs_b->runtime;
+ if (runtime > cfs_b->quota) {
+ cfs_b->burst_time += runtime - cfs_b->quota;
+ cfs_b->nr_burst++;
+ }
+ }
+
overrun = min(overrun, cfs_b->max_overrun);
refill = cfs_b->quota * overrun;
cfs_b->runtime += refill;
cfs_b->runtime = min(cfs_b->runtime, cfs_b->buffer);
+
+ cfs_b->previous_runtime = cfs_b->runtime;
}
}

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index ff8b5382485d..4adb984e5197 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -367,6 +367,7 @@ struct cfs_bandwidth {
u64 burst;
u64 buffer;
u64 max_overrun;
+ u64 previous_runtime;
s64 hierarchical_quota;

u8 idle;
@@ -379,7 +380,9 @@ struct cfs_bandwidth {
/* Statistics: */
int nr_periods;
int nr_throttled;
+ int nr_burst;
u64 throttled_time;
+ u64 burst_time;
#endif
};

--
2.14.4.44.g2045bb6
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