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Subject[PATCH V5 6/8] sched: rewrite update_cpu_load_nohz
Date
After change to sched_avg, the cpu load in idle exit was decayed.
So, it maybe near zero if waking a long time sleep task, or, a full
non-decay load if waking a new forked task. Then, we can use it to
reflect the cpu load, don't need to pretend 0.

Signed-off-by: Alex Shi <alex.shi@linaro.org>
---
kernel/sched/proc.c | 19 ++-----------------
1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/kernel/sched/proc.c b/kernel/sched/proc.c
index 057bb9b..383c4ba 100644
--- a/kernel/sched/proc.c
+++ b/kernel/sched/proc.c
@@ -461,28 +461,13 @@ void update_idle_cpu_load(struct rq *this_rq)
}

/*
- * Called from tick_nohz_idle_exit() -- try and fix up the ticks we missed.
+ * Called from tick_nohz_idle_exit()
*/
void update_cpu_load_nohz(void)
{
struct rq *this_rq = this_rq();
- unsigned long curr_jiffies = ACCESS_ONCE(jiffies);
- unsigned long pending_updates;
-
- if (curr_jiffies == this_rq->last_load_update_tick)
- return;

- raw_spin_lock(&this_rq->lock);
- pending_updates = curr_jiffies - this_rq->last_load_update_tick;
- if (pending_updates) {
- this_rq->last_load_update_tick = curr_jiffies;
- /*
- * We were idle, this means load 0, the current load might be
- * !0 due to remote wakeups and the sort.
- */
- __update_cpu_load(this_rq, 0);
- }
- raw_spin_unlock(&this_rq->lock);
+ update_idle_cpu_load(this_rq);
}
#endif /* CONFIG_NO_HZ */

--
1.8.3.2


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