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Subject[PATCH V5 3/8] sched: remove source_load and target_load
Date
We have no load_idx any more, so source/target_load always return the
same value as weighted_cpuload. So we can remove these 2 functions.

Signed-off-by: Alex Shi <alex.shi@linaro.org>
---
kernel/sched/fair.c | 54 +++++------------------------------------------------
1 file changed, 5 insertions(+), 49 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 12a35ea..cad2b6d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1015,8 +1015,6 @@ bool should_numa_migrate_memory(struct task_struct *p, struct page * page,
}

static unsigned long weighted_cpuload(const int cpu);
-static unsigned long source_load(int cpu);
-static unsigned long target_load(int cpu);
static unsigned long power_of(int cpu);
static long effective_load(struct task_group *tg, int cpu, long wl, long wg);

@@ -3951,45 +3949,11 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
}

#ifdef CONFIG_SMP
-/* Used instead of source_load when we know the type == 0 */
static unsigned long weighted_cpuload(const int cpu)
{
return cpu_rq(cpu)->cfs.runnable_load_avg;
}

-/*
- * Return a low guess at the load of a migration-source cpu weighted
- * according to the scheduling class and "nice" value.
- *
- * We want to under-estimate the load of migration sources, to
- * balance conservatively.
- */
-static unsigned long source_load(int cpu)
-{
- struct rq *rq = cpu_rq(cpu);
- unsigned long total = weighted_cpuload(cpu);
-
- if (!sched_feat(LB_BIAS))
- return total;
-
- return min(rq->cpu_load, total);
-}
-
-/*
- * Return a high guess at the load of a migration-target cpu weighted
- * according to the scheduling class and "nice" value.
- */
-static unsigned long target_load(int cpu)
-{
- struct rq *rq = cpu_rq(cpu);
- unsigned long total = weighted_cpuload(cpu);
-
- if (!sched_feat(LB_BIAS))
- return total;
-
- return max(rq->cpu_load, total);
-}
-
static unsigned long power_of(int cpu)
{
return cpu_rq(cpu)->cpu_power;
@@ -4202,8 +4166,8 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)

this_cpu = smp_processor_id();
prev_cpu = task_cpu(p);
- load = source_load(prev_cpu);
- this_load = target_load(this_cpu);
+ load = weighted_cpuload(prev_cpu);
+ this_load = weighted_cpuload(this_cpu);

/*
* If sync wakeup then subtract the (maximum possible)
@@ -4259,7 +4223,7 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, int sync)

if (balanced ||
(this_load <= load &&
- this_load + target_load(prev_cpu) <= tl_per_task)) {
+ this_load + weighted_cpuload(prev_cpu) <= tl_per_task)) {
/*
* This domain has SD_WAKE_AFFINE and
* p is cache cold in this domain, and
@@ -4301,11 +4265,7 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu)
avg_load = 0;

for_each_cpu(i, sched_group_cpus(group)) {
- /* Bias balancing toward cpus of our domain */
- if (local_group)
- load = source_load(i);
- else
- load = target_load(i);
+ load = weighted_cpuload(i);

avg_load += load;
}
@@ -5763,11 +5723,7 @@ static inline void update_sg_lb_stats(struct lb_env *env,
for_each_cpu_and(i, sched_group_cpus(group), env->cpus) {
struct rq *rq = cpu_rq(i);

- /* Bias balancing toward cpus of our domain */
- if (local_group)
- load = target_load(i);
- else
- load = source_load(i);
+ load = weighted_cpuload(i);

sgs->group_load += load;
sgs->sum_nr_running += rq->nr_running;
--
1.8.3.2


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