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Subject[patch v7 08/21] sched: scale_rt_power rename and meaning change
Date
The scale_rt_power() used to represent the left CPU utilization
after reduce rt utilization. so named it as scale_rt_power has a bit
inappropriate.

Since we need to use the rt utilization in some incoming patches, we
just change return value of this function to rt utilization, and
rename it as scale_rt_util(). Then, its usage is changed in
update_cpu_power() accordingly.

Signed-off-by: Alex Shi <alex.shi@intel.com>
---
kernel/sched/fair.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index a0bd2f3..c47933f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4277,10 +4277,10 @@ unsigned long __weak arch_scale_smt_power(struct sched_domain *sd, int cpu)
return default_scale_smt_power(sd, cpu);
}

-unsigned long scale_rt_power(int cpu)
+unsigned long scale_rt_util(int cpu)
{
struct rq *rq = cpu_rq(cpu);
- u64 total, available, age_stamp, avg;
+ u64 total, age_stamp, avg;

/*
* Since we're reading these variables without serialization make sure
@@ -4292,10 +4292,8 @@ unsigned long scale_rt_power(int cpu)
total = sched_avg_period() + (rq->clock - age_stamp);

if (unlikely(total < avg)) {
- /* Ensures that power won't end up being negative */
- available = 0;
- } else {
- available = total - avg;
+ /* Ensures rt utilization won't beyond full scaled value */
+ return SCHED_POWER_SCALE;
}

if (unlikely((s64)total < SCHED_POWER_SCALE))
@@ -4303,7 +4301,7 @@ unsigned long scale_rt_power(int cpu)

total >>= SCHED_POWER_SHIFT;

- return div_u64(available, total);
+ return div_u64(avg, total);
}

static void update_cpu_power(struct sched_domain *sd, int cpu)
@@ -4330,7 +4328,7 @@ static void update_cpu_power(struct sched_domain *sd, int cpu)

power >>= SCHED_POWER_SHIFT;

- power *= scale_rt_power(cpu);
+ power *= SCHED_POWER_SCALE - scale_rt_util(cpu);
power >>= SCHED_POWER_SHIFT;

if (!power)
--
1.7.12


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