[patch] sched: Keep total / count stats in addition to the max forwait time

[Arjan van de Ven]

From: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Subject: sched: Keep total / count stats in addition to the max for wait time

Right now, the linux kernel (with scheduler statistics enabled) keeps track
of the maximum time a process is waiting to be scheduled. While the maximum
is a very useful metric, tracking average and total is equally useful
(at least for latencytop) to figure out the accumulated effect of scheduler
delays. The accumulated effect is important to judge the performance impact
of scheduler tuning/behavior.

Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>

---
 include/linux/sched.h |    2 ++
 kernel/sched_debug.c  |    4 ++++
 kernel/sched_fair.c   |    3 +++
 3 files changed, 9 insertions(+)

Index: linux-2.6.24-rc8/include/linux/sched.h
===================================================================
--- linux-2.6.24-rc8.orig/include/linux/sched.h
+++ linux-2.6.24-rc8/include/linux/sched.h
@@ -877,6 +877,8 @@ struct sched_entity {
 #ifdef CONFIG_SCHEDSTATS
 	u64			wait_start;
 	u64			wait_max;
+	u64			wait_count;
+	u64			wait_sum;
 
 	u64			sleep_start;
 	u64			sleep_max;
Index: linux-2.6.24-rc8/kernel/sched_debug.c
===================================================================
--- linux-2.6.24-rc8.orig/kernel/sched_debug.c
+++ linux-2.6.24-rc8/kernel/sched_debug.c
@@ -299,6 +299,8 @@ void proc_sched_show_task(struct task_st
 	PN(se.exec_max);
 	PN(se.slice_max);
 	PN(se.wait_max);
+	PN(se.wait_sum);
+	P(se.wait_count);
 	P(sched_info.bkl_count);
 	P(se.nr_migrations);
 	P(se.nr_migrations_cold);
@@ -366,6 +368,8 @@ void proc_sched_set_task(struct task_str
 {
 #ifdef CONFIG_SCHEDSTATS
 	p->se.wait_max				= 0;
+	p->se.wait_sum				= 0;
+	p->se.wait_count			= 0;
 	p->se.sleep_max				= 0;
 	p->se.sum_sleep_runtime			= 0;
 	p->se.block_max				= 0;
Index: linux-2.6.24-rc8/kernel/sched_fair.c
===================================================================
--- linux-2.6.24-rc8.orig/kernel/sched_fair.c
+++ linux-2.6.24-rc8/kernel/sched_fair.c
@@ -385,6 +385,9 @@ update_stats_wait_end(struct cfs_rq *cfs
 {
 	schedstat_set(se->wait_max, max(se->wait_max,
 			rq_of(cfs_rq)->clock - se->wait_start));
+	schedstat_set(se->wait_count, se->wait_count + 1);
+	schedstat_set(se->wait_sum, se->wait_sum +
+			rq_of(cfs_rq)->clock - se->wait_start);
 	schedstat_set(se->wait_start, 0);
 }
 

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