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From 44d32ba267d56fd931b1bc3771dcb8e478413a02 Mon Sep 17 00:00:00 2001
From: hamadmarri <hamad.s.almarri@gmail.com>
Date: Sat, 23 Mar 2024 22:47:32 +0300
Subject: [PATCH 7/8] - change bs_shared_quota to 105us - change bs_node.est
initial value to 0 instead of shared_quota - check_wakeup preempt right away
if entity is before current eventhough current didn't finished min slice
---
kernel/sched/bs.c | 17 +++++++++++++++--
kernel/sched/core.c | 2 +-
2 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/kernel/sched/bs.c b/kernel/sched/bs.c
index ca12d3aa5..9515eb3a7 100644
--- a/kernel/sched/bs.c
+++ b/kernel/sched/bs.c
@@ -15,7 +15,7 @@
#include "pelt.h"
unsigned int sysctl_sched_base_slice = 7000ULL;
-unsigned int bs_shared_quota = 6600000ULL; // 6.6ms
+unsigned int bs_shared_quota = 105000ULL; // 105us
u32 alpha = 500U;
struct lb_env {
@@ -471,6 +471,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int
struct cfs_rq *cfs_rq = &rq->cfs;
struct task_struct *curr = rq->curr;
struct sched_entity *curr_se = &curr->se, *pse = &p->se;
+ int cse_is_idle, pse_is_idle;
if (unlikely(curr_se == pse))
return;
@@ -490,6 +491,18 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int
if (unlikely(p->policy != SCHED_NORMAL) || !sched_feat(WAKEUP_PREEMPTION))
return;
+ cse_is_idle = se_is_idle(curr_se);
+ pse_is_idle = se_is_idle(pse);
+
+ /*
+ * Preempt an idle group in favor of a non-idle group (and don't preempt
+ * in the inverse case).
+ */
+ if (cse_is_idle && !pse_is_idle)
+ goto preempt;
+ if (cse_is_idle != pse_is_idle)
+ return;
+
update_curr(cfs_rq_of(curr_se));
/*
@@ -500,7 +513,7 @@ static void check_preempt_wakeup_fair(struct rq *rq, struct task_struct *p, int
if (__entity_end_quota(cfs_rq, curr_se))
goto preempt;
- if (entity_before(&pse->bs_node, &curr_se->bs_node) && entity_end_min_slice(curr_se))
+ if (entity_before(&pse->bs_node, &curr_se->bs_node))
goto preempt;
return;
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f99b51020..ed8a6b75d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4516,7 +4516,7 @@ static void __sched_fork(unsigned long clone_flags, struct task_struct *p)
p->se.slice = 0;
p->se.bs_node.vburst = 0;
- p->se.bs_node.est = (u64)bs_shared_quota;
+ p->se.bs_node.est = 0;
INIT_LIST_HEAD(&p->se.group_node);
--
2.44.0
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