gentoo-overlay/sys-kernel/hardened-kernel/files/linux-5.4/9120_0120-add-scheduler-tur...

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <arjan@linux.intel.com>
Date: Wed, 21 Nov 2018 21:21:44 +0000
Subject: [PATCH] add scheduler turbo3 patch
Small scheduler tweak to make the scheduler more turbo3 aware
---
arch/x86/kernel/itmt.c | 14 ++++++++++++++
kernel/sched/fair.c | 19 +++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/arch/x86/kernel/itmt.c b/arch/x86/kernel/itmt.c
index 1cb3ca9bba49..eeb201bb014b 100644
--- a/arch/x86/kernel/itmt.c
+++ b/arch/x86/kernel/itmt.c
@@ -173,6 +173,11 @@ int arch_asym_cpu_priority(int cpu)
return per_cpu(sched_core_priority, cpu);
}
+extern int best_core;
+extern int second_best_core;
+static int best_core_score;
+static int second_best_core_score;
+
/**
* sched_set_itmt_core_prio() - Set CPU priority based on ITMT
* @prio: Priority of cpu core
@@ -202,5 +207,14 @@ void sched_set_itmt_core_prio(int prio, int core_cpu)
smt_prio = prio * smp_num_siblings / i;
per_cpu(sched_core_priority, cpu) = smt_prio;
i++;
+
+ if (smt_prio > best_core_score) {
+ best_core = cpu;
+ best_core_score = smt_prio;
+ } else
+ if (smt_prio > second_best_core_score) {
+ second_best_core = cpu;
+ second_best_core_score = smt_prio;
+ }
}
}
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 69a81a5709ff..e1961b94270d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6439,6 +6439,10 @@ static int find_energy_efficient_cpu(struct task_struct *p, int prev_cpu)
*
* preempt must be disabled.
*/
+
+int best_core = -1;
+int second_best_core = -1;
+
static int
select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_flags)
{
@@ -6462,6 +6466,21 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
cpumask_test_cpu(cpu, p->cpus_ptr);
}
+ if (prev_cpu != best_core && prev_cpu != second_best_core &&
+ cpu_rq(prev_cpu)->nr_running != 0) {
+ if (second_best_core != -1 && cpu_rq(second_best_core)->nr_running == 0 &&
+ nr_iowait_cpu(second_best_core) < 2 && cpu_to_node(prev_cpu) == cpu_to_node(second_best_core))
+ prev_cpu = second_best_core;
+ if (best_core != -1 && cpu_rq(best_core)->nr_running == 0 &&
+ nr_iowait_cpu(best_core) < 2 && cpu_to_node(prev_cpu) == cpu_to_node(best_core))
+ prev_cpu = best_core;
+ }
+/*
+ if (prev_cpu > 0 && cpu_rq(prev_cpu)->nr_running != 0 && cpu_rq(prev_cpu - 1)->nr_running == 0)
+ prev_cpu = prev_cpu - 1;
+*/
+
+
rcu_read_lock();
for_each_domain(cpu, tmp) {
if (!(tmp->flags & SD_LOAD_BALANCE))
--
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