Messages in this thread Patch in this message | | | Date | Tue, 17 Nov 2009 20:06:36 +0530 | From | Bharata B Rao <> | Subject | [RFC v4 PATCH 5/7] sched: Add throttle time statistics to /proc/sched_debug |
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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 75e6e60..b7f238c 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1183,6 +1183,12 @@ 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 efb8440..a8f24fb 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 + spin_lock_irqsave(&rq->lock, flags); + SEQ_printf(m, " .%-30s: %d\n", "cfs_throttled", + cfs_rq->cfs_throttled); + SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "cfs_time", + SPLIT_NS(cfs_rq->cfs_time)); + SEQ_printf(m, " .%-30s: %Ld.%06ld\n", "cfs_runtime", + SPLIT_NS(cfs_rq->cfs_runtime)); + spin_unlock_irqrestore(&rq->lock, flags); +#endif /* CONFIG_CFS_HARD_LIMITS */ print_cfs_group_stats(m, cpu, cfs_rq->tg); #endif } @@ -310,7 +325,7 @@ 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 3d0f006..c57ca54 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -191,6 +191,23 @@ find_matching_se(struct sched_entity **se, struct sched_entity **pse) #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 struct cfs_rq *sched_cfs_period_cfs_rq(struct cfs_bandwidth *cfs_b, int cpu) { @@ -224,6 +241,7 @@ static void sched_cfs_runtime_exceeded(struct sched_entity *se, if (cfs_rq->cfs_time > cfs_rq->cfs_runtime) { cfs_rq->cfs_throttled = 1; + update_stats_throttle_start(cfs_rq, se); resched_task(tsk_curr); } } @@ -269,6 +287,8 @@ void do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b) cfs_rq_runtime_lock(cfs_rq); cfs_rq->cfs_time = 0; if (cfs_rq_throttled(cfs_rq)) { + update_rq_clock(rq); + update_stats_throttle_end(cfs_rq, se); cfs_rq->cfs_throttled = 0; enqueue_throttled_entity(rq, se); }
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