sched,stats: Further simplify sched_info
There's no point doing delta==0 updates.
Suggested-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h
index 33ffd41..111072e 100644
--- a/kernel/sched/stats.h
+++ b/kernel/sched/stats.h
@@ -160,10 +160,11 @@ static inline void sched_info_dequeue(struct rq *rq, struct task_struct *t)
{
unsigned long long delta = 0;
- if (t->sched_info.last_queued) {
- delta = rq_clock(rq) - t->sched_info.last_queued;
- t->sched_info.last_queued = 0;
- }
+ if (!t->sched_info.last_queued)
+ return;
+
+ delta = rq_clock(rq) - t->sched_info.last_queued;
+ t->sched_info.last_queued = 0;
t->sched_info.run_delay += delta;
rq_sched_info_dequeue(rq, delta);
@@ -176,12 +177,14 @@ static inline void sched_info_dequeue(struct rq *rq, struct task_struct *t)
*/
static void sched_info_arrive(struct rq *rq, struct task_struct *t)
{
- unsigned long long now = rq_clock(rq), delta = 0;
+ unsigned long long now, delta = 0;
- if (t->sched_info.last_queued) {
- delta = now - t->sched_info.last_queued;
- t->sched_info.last_queued = 0;
- }
+ if (!t->sched_info.last_queued)
+ return;
+
+ now = rq_clock(rq);
+ delta = now - t->sched_info.last_queued;
+ t->sched_info.last_queued = 0;
t->sched_info.run_delay += delta;
t->sched_info.last_arrival = now;
t->sched_info.pcount++;