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

Vincent Guittot
2018-05-25T13:13:24Z

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

Signed-off-by: Vincent Guittot <vincent.guittot@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