Messages in this thread Patch in this message | | | From | Huaixin Chang <> | Subject | [PATCH 3/4] sched/fair: Add cfs bandwidth burst statistics | Date | Wed, 20 Jan 2021 20:27:14 +0800 |
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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 fecf0f05ef0c..80ca763ca492 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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