From 03cdbd12deee8021bd81acc6ddd645bdf9c42096 Mon Sep 17 00:00:00 2001
From: hamadmarri <hamad.s.almarri@gmail.com>
Date: Wed, 27 Mar 2024 03:05:07 +0300
Subject: [PATCH 15/16] removed lat_sens

---
 kernel/sched/core.c  | 33 ---------------------------------
 kernel/sched/idle.c  | 15 ++-------------
 kernel/sched/sched.h |  9 +--------
 3 files changed, 3 insertions(+), 54 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ff6e2d0a1..49df55bb0 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3347,24 +3347,6 @@ void relax_compatible_cpus_allowed_ptr(struct task_struct *p)
 	WARN_ON_ONCE(ret);
 }
 
-#ifdef CONFIG_ECHO_SCHED
-inline void inc_nr_lat_sensitive(unsigned int cpu, struct task_struct *p)
-{
-	if (per_cpu(nr_lat_sensitive, cpu) == 0 || per_cpu(nr_lat_sensitive, cpu) == -10)
-		per_cpu(nr_lat_sensitive, cpu) = HZ / 78;
-}
-
-inline void dec_nr_lat_sensitive(unsigned int cpu)
-{
-	if (per_cpu(nr_lat_sensitive, cpu) > -10) {
-		per_cpu(nr_lat_sensitive, cpu)--;
-
-		if (per_cpu(nr_lat_sensitive, cpu) == 0)
-			per_cpu(nr_lat_sensitive, cpu) = -1;
-	}
-}
-#endif
-
 void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 {
 #ifdef CONFIG_SCHED_DEBUG
@@ -5722,13 +5704,6 @@ void scheduler_tick(void)
 	if (curr->flags & PF_WQ_WORKER)
 		wq_worker_tick(curr);
 
-#ifdef CONFIG_ECHO_SCHED
-	if (idle_cpu(cpu))
-		inc_nr_lat_sensitive(cpu, NULL);
-	else
-		dec_nr_lat_sensitive(cpu);
-#endif
-
 #ifdef CONFIG_SMP
 	rq->idle_balance = idle_cpu(cpu);
 	trigger_load_balance(rq);
@@ -9937,10 +9912,6 @@ LIST_HEAD(task_groups);
 static struct kmem_cache *task_group_cache __ro_after_init;
 #endif
 
-#ifdef CONFIG_ECHO_SCHED
-DEFINE_PER_CPU(int, nr_lat_sensitive);
-#endif
-
 void __init sched_init(void)
 {
 	unsigned long ptr = 0;
@@ -10079,10 +10050,6 @@ void __init sched_init(void)
 		hrtick_rq_init(rq);
 		atomic_set(&rq->nr_iowait, 0);
 
-#ifdef CONFIG_ECHO_SCHED
-		per_cpu(nr_lat_sensitive, i) = 0;
-#endif
-
 #ifdef CONFIG_SCHED_CORE
 		rq->core = rq;
 		rq->core_pick = NULL;
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index dbfc30710..95e7f83b5 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -237,9 +237,7 @@ static void cpuidle_idle_call(void)
 static void do_idle(void)
 {
 	int cpu = smp_processor_id();
-#ifdef CONFIG_ECHO_SCHED
-	int pm_disabled = per_cpu(nr_lat_sensitive, cpu);
-#endif
+
 	/*
 	 * Check if we need to update blocked load
 	 */
@@ -307,22 +305,13 @@ static void do_idle(void)
 		 * broadcast device expired for us, we don't want to go deep
 		 * idle as we know that the IPI is going to arrive right away.
 		 */
-		if (
-#ifdef CONFIG_ECHO_SCHED
-			pm_disabled > 0 ||
-#endif
-			cpu_idle_force_poll || tick_check_broadcast_expired()) {
+		if (cpu_idle_force_poll || tick_check_broadcast_expired()) {
 			tick_nohz_idle_restart_tick();
 			cpu_idle_poll();
-			dec_nr_lat_sensitive(cpu);
 		} else {
 			cpuidle_idle_call();
 		}
 
-#ifdef CONFIG_ECHO_SCHED
-		if (pm_disabled < 0)
-			dec_nr_lat_sensitive(cpu);
-#endif
 		arch_cpu_idle_exit();
 	}
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 56b5c0114..e27be055c 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1901,9 +1901,7 @@ DECLARE_PER_CPU(struct sched_domain_shared __rcu *, sd_llc_shared);
 DECLARE_PER_CPU(struct sched_domain __rcu *, sd_numa);
 DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_packing);
 DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_cpucapacity);
-#ifdef CONFIG_ECHO_SCHED
-DECLARE_PER_CPU(int, nr_lat_sensitive);
-#endif
+
 extern struct static_key_false sched_asym_cpucapacity;
 extern struct static_key_false sched_cluster_active;
 
@@ -2561,11 +2559,6 @@ extern void wakeup_preempt(struct rq *rq, struct task_struct *p, int flags);
 #define SCHED_NR_MIGRATE_BREAK 32
 #endif
 
-#ifdef CONFIG_ECHO_SCHED
-extern inline void inc_nr_lat_sensitive(unsigned int cpu, struct task_struct *p);
-extern inline void dec_nr_lat_sensitive(unsigned int cpu);
-#endif
-
 extern const_debug unsigned int sysctl_sched_nr_migrate;
 extern const_debug unsigned int sysctl_sched_migration_cost;
 
-- 
2.44.0