sched: update delay-accounting to use CFS's precise stats

update delay-accounting to use CFS's precise stats.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

fs/proc/base.c

@@ -296,7 +296,7 @@ static int proc_pid_wchan(struct task_struct *task, char *buffer)
  */
 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
 {
-	return sprintf(buffer, "%lu %lu %lu\n",
+	return sprintf(buffer, "%llu %llu %lu\n",
 			task->sched_info.cpu_time,
 			task->sched_info.run_delay,
 			task->sched_info.pcnt);

include/linux/sched.h

@@ -562,13 +562,13 @@ struct reclaim_state;
 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
 struct sched_info {
 	/* cumulative counters */
-	unsigned long	cpu_time,	/* time spent on the cpu */
-			run_delay,	/* time spent waiting on a runqueue */
-			pcnt;		/* # of timeslices run on this cpu */
+	unsigned long pcnt;	      /* # of times run on this cpu */
+	unsigned long long cpu_time,  /* time spent on the cpu */
+			   run_delay; /* time spent waiting on a runqueue */
 
 	/* timestamps */
-	unsigned long	last_arrival,	/* when we last ran on a cpu */
-			last_queued;	/* when we were last queued to run */
+	unsigned long long last_arrival,/* when we last ran on a cpu */
+			   last_queued;	/* when we were last queued to run */
 };
 #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
 

kernel/delayacct.c

@@ -99,9 +99,10 @@ void __delayacct_blkio_end(void)
 int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
 {
 	s64 tmp;
-	struct timespec ts;
-	unsigned long t1,t2,t3;
+	unsigned long t1;
+	unsigned long long t2, t3;
 	unsigned long flags;
+	struct timespec ts;
 
 	/* Though tsk->delays accessed later, early exit avoids
 	 * unnecessary returning of other data
@@ -124,11 +125,10 @@ int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
 
 	d->cpu_count += t1;
 
-	jiffies_to_timespec(t2, &ts);
-	tmp = (s64)d->cpu_delay_total + timespec_to_ns(&ts);
+	tmp = (s64)d->cpu_delay_total + t2;
 	d->cpu_delay_total = (tmp < (s64)d->cpu_delay_total) ? 0 : tmp;
 
-	tmp = (s64)d->cpu_run_virtual_total + (s64)jiffies_to_usecs(t3) * 1000;
+	tmp = (s64)d->cpu_run_virtual_total + t3;
 	d->cpu_run_virtual_total =
 		(tmp < (s64)d->cpu_run_virtual_total) ?	0 : tmp;
 

kernel/exit.c

@@ -122,9 +122,9 @@ static void __exit_signal(struct task_struct *tsk)
 		sig->maj_flt += tsk->maj_flt;
 		sig->nvcsw += tsk->nvcsw;
 		sig->nivcsw += tsk->nivcsw;
-		sig->sched_time += tsk->sched_time;
 		sig->inblock += task_io_get_inblock(tsk);
 		sig->oublock += task_io_get_oublock(tsk);
+		sig->sum_sched_runtime += tsk->se.sum_exec_runtime;
 		sig = NULL; /* Marker for below. */
 	}
 

kernel/fork.c

@@ -877,7 +877,7 @@ static inline int copy_signal(unsigned long clone_flags, struct task_struct * ts
 	sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
 	sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
 	sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0;
-	sig->sched_time = 0;
+	sig->sum_sched_runtime = 0;
 	INIT_LIST_HEAD(&sig->cpu_timers[0]);
 	INIT_LIST_HEAD(&sig->cpu_timers[1]);
 	INIT_LIST_HEAD(&sig->cpu_timers[2]);
@@ -1040,7 +1040,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 
 	p->utime = cputime_zero;
 	p->stime = cputime_zero;
- 	p->sched_time = 0;
+
 #ifdef CONFIG_TASK_XACCT
 	p->rchar = 0;		/* I/O counter: bytes read */
 	p->wchar = 0;		/* I/O counter: bytes written */

kernel/sched_stats.h

@@ -21,7 +21,7 @@ static int show_schedstat(struct seq_file *seq, void *v)
 
 		/* runqueue-specific stats */
 		seq_printf(seq,
-		    "cpu%d %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu",
+		    "cpu%d %lu %lu %lu %lu %lu %lu %lu %lu %lu %llu %llu %lu",
 		    cpu, rq->yld_both_empty,
 		    rq->yld_act_empty, rq->yld_exp_empty, rq->yld_cnt,
 		    rq->sched_switch, rq->sched_cnt, rq->sched_goidle,