[PATCH v5 09/10] sched: remove rt_avg code

[Vincent Guittot]

rt_avg is no more used anywhere so we can remove all related code

Signed-off-by: Vincent Guittot <vincent.guit...@linaro.org>
---
 kernel/sched/core.c  | 26 --------------------------
 kernel/sched/sched.h | 17 -----------------
 2 files changed, 43 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ab58288..213d277 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -650,23 +650,6 @@ bool sched_can_stop_tick(struct rq *rq)
        return true;
 }
 #endif /* CONFIG_NO_HZ_FULL */
-
-void sched_avg_update(struct rq *rq)
-{
-       s64 period = sched_avg_period();
-
-       while ((s64)(rq_clock(rq) - rq->age_stamp) > period) {
-               /*
-                * Inline assembly required to prevent the compiler
-                * optimising this loop into a divmod call.
-                * See __iter_div_u64_rem() for another example of this.
-                */
-               asm("" : "+rm" (rq->age_stamp));
-               rq->age_stamp += period;
-               rq->rt_avg /= 2;
-       }
-}
-
 #endif /* CONFIG_SMP */
 
 #if defined(CONFIG_RT_GROUP_SCHED) || (defined(CONFIG_FAIR_GROUP_SCHED) && \
@@ -5710,13 +5693,6 @@ void set_rq_offline(struct rq *rq)
        }
 }
 
-static void set_cpu_rq_start_time(unsigned int cpu)
-{
-       struct rq *rq = cpu_rq(cpu);
-
-       rq->age_stamp = sched_clock_cpu(cpu);
-}
-
 /*
  * used to mark begin/end of suspend/resume:
  */
@@ -5834,7 +5810,6 @@ static void sched_rq_cpu_starting(unsigned int cpu)
 
 int sched_cpu_starting(unsigned int cpu)
 {
-       set_cpu_rq_start_time(cpu);
        sched_rq_cpu_starting(cpu);
        sched_tick_start(cpu);
        return 0;
@@ -6102,7 +6077,6 @@ void __init sched_init(void)
 
 #ifdef CONFIG_SMP
        idle_thread_set_boot_cpu();
-       set_cpu_rq_start_time(smp_processor_id());
 #endif
        init_sched_fair_class();
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 718c55d..1929db7 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -846,8 +846,6 @@ struct rq {
 
        struct list_head cfs_tasks;
 
-       u64                     rt_avg;
-       u64                     age_stamp;
        struct sched_avg        avg_rt;
        struct sched_avg        avg_dl;
        struct sched_avg        avg_irq;
@@ -1710,11 +1708,6 @@ extern const_debug unsigned int sysctl_sched_time_avg;
 extern const_debug unsigned int sysctl_sched_nr_migrate;
 extern const_debug unsigned int sysctl_sched_migration_cost;
 
-static inline u64 sched_avg_period(void)
-{
-       return (u64)sysctl_sched_time_avg * NSEC_PER_MSEC / 2;
-}
-
 #ifdef CONFIG_SCHED_HRTICK
 
 /*
@@ -1751,8 +1744,6 @@ unsigned long arch_scale_freq_capacity(int cpu)
 #endif
 
 #ifdef CONFIG_SMP
-extern void sched_avg_update(struct rq *rq);
-
 #ifndef arch_scale_cpu_capacity
 static __always_inline
 unsigned long arch_scale_cpu_capacity(struct sched_domain *sd, int cpu)
@@ -1763,12 +1754,6 @@ unsigned long arch_scale_cpu_capacity(struct 
sched_domain *sd, int cpu)
        return SCHED_CAPACITY_SCALE;
 }
 #endif
-
-static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta)
-{
-       rq->rt_avg += rt_delta * arch_scale_freq_capacity(cpu_of(rq));
-       sched_avg_update(rq);
-}
 #else
 #ifndef arch_scale_cpu_capacity
 static __always_inline
@@ -1777,8 +1762,6 @@ unsigned long arch_scale_cpu_capacity(void 
__always_unused *sd, int cpu)
        return SCHED_CAPACITY_SCALE;
 }
 #endif
-static inline void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { }
-static inline void sched_avg_update(struct rq *rq) { }
 #endif
 
 struct rq *__task_rq_lock(struct task_struct *p, struct rq_flags *rf)
-- 
2.7.4