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Message-ID: <b040c32a0812162341v1fe5f419xfa379c880ca4c8da@mail.gmail.com>
Date: Tue, 16 Dec 2008 23:41:22 -0800
From: Ken Chen <kenchen@...gle.com>
To: Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [patch] schedstat: consolidate per-task cpu runtime stats
When we turn on CONFIG_SCHEDSTATS, per-task cpu runtime is accumulated
twice. Once in task->se.sum_exec_runtime and once in sched_info.cpu_time.
These two stats are exactly the same.
Given that task->se.sum_exec_runtime is always accumulated by the core
scheduler, sched_info can reuse that data instead of duplicate the accounting.
Signed-off-by: Ken Chen <kenchen@...gle.com>
diff --git a/fs/proc/base.c b/fs/proc/base.c
index d467760..4d745ba 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -347,7 +347,7 @@
static int proc_pid_schedstat(struct task_struct *task, char *buffer)
{
return sprintf(buffer, "%llu %llu %lu\n",
- task->sched_info.cpu_time,
+ task->se.sum_exec_runtime,
task->sched_info.run_delay,
task->sched_info.pcount);
}
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 55e30d1..a0fa340 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -672,8 +672,7 @@ struct reclaim_state;
struct sched_info {
/* cumulative counters */
unsigned long pcount; /* # of times run on this cpu */
- unsigned long long cpu_time, /* time spent on the cpu */
- run_delay; /* time spent waiting on a runqueue */
+ unsigned long long run_delay; /* time spent waiting on a runqueue */
/* timestamps */
unsigned long long last_arrival,/* when we last ran on a cpu */
diff --git a/kernel/delayacct.c b/kernel/delayacct.c
index b3179da..abb6e17 100644
--- a/kernel/delayacct.c
+++ b/kernel/delayacct.c
@@ -127,7 +127,7 @@ int __delayacct_add_tsk
*/
t1 = tsk->sched_info.pcount;
t2 = tsk->sched_info.run_delay;
- t3 = tsk->sched_info.cpu_time;
+ t3 = tsk->se.sum_exec_runtime;
d->cpu_count += t1;
diff --git a/kernel/sched.c b/kernel/sched.c
index 4d1920d..1ed1809 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -586,6 +586,8 @@ struct rq {
#ifdef CONFIG_SCHEDSTATS
/* latency stats */
struct sched_info rq_sched_info;
+ unsigned long long rq_cpu_time;
+ /* could above be rq->cfs_rq.exec_clock + rq->rt_rq.rt_runtime ? */
/* sys_sched_yield() stats */
unsigned int yld_exp_empty;
diff --git a/kernel/sched_stats.h b/kernel/sched_stats.h
index 4272594..b07eee8 100644
--- a/kernel/sched_stats.h
+++ b/kernel/sched_stats.h
@@ -31,7 +31,7 @@ static int show_schedstat(struct seq_file *seq, void *v)
rq->yld_act_empty, rq->yld_exp_empty, rq->yld_count,
rq->sched_switch, rq->sched_count, rq->sched_goidle,
rq->ttwu_count, rq->ttwu_local,
- rq->rq_sched_info.cpu_time,
+ rq->rq_cpu_time,
rq->rq_sched_info.run_delay, rq->rq_sched_info.pcount);
seq_printf(seq, "\n");
@@ -123,7 +123,7 @@ static inline void
rq_sched_info_depart(struct rq *rq, unsigned long long delta)
{
if (rq)
- rq->rq_sched_info.cpu_time += delta;
+ rq->rq_cpu_time += delta;
}
static inline void
@@ -238,7 +238,6 @@ static inline void sched_info_depart
unsigned long long delta = task_rq(t)->clock -
t->sched_info.last_arrival;
- t->sched_info.cpu_time += delta;
rq_sched_info_depart(task_rq(t), delta);
if (t->state == TASK_RUNNING)
--
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