linux-pikaos-template/patches/0002-eevdfbore.patch

From 377657f92d256b364813e3f8b2a58edfc9833815 Mon Sep 17 00:00:00 2001
From: Peter Jung <admin@ptr1337.dev>
Date: Sun, 30 Jul 2023 09:43:51 +0200
Subject: [PATCH] bore-eevdf

Signed-off-by: Peter Jung <admin@ptr1337.dev>
---
 include/linux/sched.h   |  30 ++++++
 init/Kconfig            |  20 ++++
 kernel/sched/core.c     | 118 +++++++++++++++++++++
 kernel/sched/debug.c    |   4 +
 kernel/sched/fair.c     | 228 ++++++++++++++++++++++++++++++++++++++--
 kernel/sched/features.h |   4 +
 kernel/sched/sched.h    |   1 +
 7 files changed, 397 insertions(+), 8 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index c940c4dc8304..8663c0813f81 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -545,6 +545,26 @@ struct sched_statistics {
 #endif /* CONFIG_SCHEDSTATS */
 } ____cacheline_aligned;
 
+#ifdef CONFIG_SCHED_BORE
+union union16 {
+	u16	u16;
+	s16	s16;
+	u8	u8[2];
+	s8	s8[2];
+};
+typedef union union16 x16;
+
+union union32 {
+	u32	u32;
+	s32	s32;
+	u16	u16[2];
+	s16	s16[2];
+	u8	u8[4];
+	s8	s8[4];
+};
+typedef union union32 x32;
+#endif // CONFIG_SCHED_BORE
+
 struct sched_entity {
 	/* For load-balancing: */
 	struct load_weight		load;
@@ -559,6 +579,12 @@ struct sched_entity {
 	u64				sum_exec_runtime;
 	u64				prev_sum_exec_runtime;
 	u64				vruntime;
+#ifdef CONFIG_SCHED_BORE
+	u64				burst_time;
+	u16				prev_burst_penalty;
+	u16				curr_burst_penalty;
+	u16				burst_penalty;
+#endif // CONFIG_SCHED_BORE
 	s64				vlag;
 	u64				slice;
 
@@ -990,6 +1016,10 @@ struct task_struct {
 	struct list_head		children;
 	struct list_head		sibling;
 	struct task_struct		*group_leader;
+#ifdef CONFIG_SCHED_BORE
+	u16	child_burst_cache;
+	u64	child_burst_last_cached;
+#endif // CONFIG_SCHED_BORE
 
 	/*
 	 * 'ptraced' is the list of tasks this task is using ptrace() on.
diff --git a/init/Kconfig b/init/Kconfig
index 71755cc8ed3e..c697be79e594 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1277,6 +1277,26 @@ config CHECKPOINT_RESTORE
 
 	  If unsure, say N here.
 
+config SCHED_BORE
+	bool "Burst-Oriented Response Enhancer"
+	default y
+	help
+	  In Desktop and Mobile computing, one might prefer interactive
+	  tasks to keep responsive no matter what they run in the background.
+
+	  Enabling this kernel feature modifies the scheduler to discriminate
+	  tasks by their burst time (runtime since it last went sleeping or
+	  yielding state) and prioritize those that run less bursty.
+	  Such tasks usually include window compositor, widgets backend,
+	  terminal emulator, video playback, games and so on.
+	  With a little impact to scheduling fairness, it may improve
+	  responsiveness especially under heavy background workload.
+
+	  You can turn it off by setting the sysctl kernel.sched_bore = 0.
+	  Enabling this feature implies NO_GENTLE_FAIR_SLEEPERS by default.
+
+	  If unsure say Y here.
+
 config SCHED_AUTOGROUP
 	bool "Automatic process group scheduling"
 	select CGROUPS
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index aff81e12460e..839605620f63 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4491,6 +4491,113 @@ int wake_up_state(struct task_struct *p, unsigned int state)
 	return try_to_wake_up(p, state, 0);
 }
 
+#ifdef CONFIG_SCHED_BORE
+extern unsigned int sched_burst_cache_lifetime;
+extern unsigned int sched_burst_fork_atavistic;
+
+void __init sched_init_bore(void) {
+	init_task.child_burst_cache = 0;
+	init_task.child_burst_last_cached = 0;
+	init_task.se.burst_time = 0;
+	init_task.se.prev_burst_penalty = 0;
+	init_task.se.curr_burst_penalty = 0;
+	init_task.se.burst_penalty = 0;
+}
+
+void inline sched_fork_bore(struct task_struct *p) {
+	p->child_burst_cache = 0;
+	p->child_burst_last_cached = 0;
+	p->se.burst_time = 0;
+	p->se.curr_burst_penalty = 0;
+}
+
+static u32 count_child_tasks(struct task_struct *p) {
+	struct task_struct *child;
+	u32 cnt = 0;
+	list_for_each_entry(child, &p->children, sibling) {cnt++;}
+	return cnt;
+}
+
+static inline bool child_burst_cache_expired(struct task_struct *p, u64 now) {
+	return (p->child_burst_last_cached + sched_burst_cache_lifetime < now);
+}
+
+static void __update_child_burst_cache(
+	struct task_struct *p, u32 cnt, u32 sum, u64 now) {
+	u16 avg = 0;
+	if (cnt) avg = DIV_ROUND_CLOSEST(sum, cnt);
+	p->child_burst_cache = max(avg, p->se.burst_penalty);
+	p->child_burst_last_cached = now;
+}
+
+static void update_child_burst_cache(struct task_struct *p, u64 now) {
+	struct task_struct *child;
+	u32 cnt = 0;
+	u32 sum = 0;
+
+	list_for_each_entry(child, &p->children, sibling) {
+		cnt++;
+		sum += child->se.burst_penalty;
+	}
+
+	__update_child_burst_cache(p, cnt, sum, now);
+}
+
+static void update_child_burst_cache_atavistic(
+	struct task_struct *p, u64 now, u32 depth, u32 *acnt, u32 *asum) {
+	struct task_struct *child, *dec;
+	u32 cnt = 0, dcnt = 0;
+	u32 sum = 0;
+
+	list_for_each_entry(child, &p->children, sibling) {
+		dec = child;
+		while ((dcnt = count_child_tasks(dec)) == 1)
+			dec = list_first_entry(&dec->children, struct task_struct, sibling);
+		
+		if (!dcnt || !depth) {
+			cnt++;
+			sum += dec->se.burst_penalty;
+		} else {
+			if (child_burst_cache_expired(dec, now))
+				update_child_burst_cache_atavistic(dec, now, depth - 1, &cnt, &sum);
+			else {
+				cnt += dcnt;
+				sum += (dec->child_burst_cache) * dcnt;
+			}
+		}
+	}
+
+	__update_child_burst_cache(p, cnt, sum, now);
+	*acnt += cnt;
+	*asum += sum;
+}
+
+static void fork_burst_penalty(struct task_struct *p) {
+	struct sched_entity *se = &p->se;
+	struct task_struct *anc = p->real_parent;
+	u64 now = ktime_get_ns();
+	u32 cnt = 0;
+	u32 sum = 0;
+
+	read_lock(&tasklist_lock);
+	
+	if (sched_burst_fork_atavistic) {
+		while ((anc->real_parent != anc) && (count_child_tasks(anc) == 1))
+			anc = anc->real_parent;
+		if (child_burst_cache_expired(anc, now))
+			update_child_burst_cache_atavistic(
+				anc, now, sched_burst_fork_atavistic - 1, &cnt, &sum);
+	} else
+		if (child_burst_cache_expired(anc, now))
+			update_child_burst_cache(anc, now);
+
+	read_unlock(&tasklist_lock);
+
+	se->burst_penalty = se->prev_burst_penalty =
+		max(se->prev_burst_penalty, anc->child_burst_cache);
+}
+#endif // CONFIG_SCHED_BORE
+
 /*
  * Perform scheduler related setup for a newly forked process p.
  * p is forked by current.
@@ -4507,6 +4614,9 @@ static void __sched_fork(unsigned long clone_flags, struct task_struct *p)
 	p->se.prev_sum_exec_runtime	= 0;
 	p->se.nr_migrations		= 0;
 	p->se.vruntime			= 0;
+#ifdef CONFIG_SCHED_BORE
+	sched_fork_bore(p);
+#endif // CONFIG_SCHED_BORE
 	p->se.vlag			= 0;
 	INIT_LIST_HEAD(&p->se.group_node);
 
@@ -4828,6 +4938,9 @@ void sched_cgroup_fork(struct task_struct *p, struct kernel_clone_args *kargs)
 
 void sched_post_fork(struct task_struct *p)
 {
+#ifdef CONFIG_SCHED_BORE
+	fork_burst_penalty(p);
+#endif // CONFIG_SCHED_BORE
 	uclamp_post_fork(p);
 }
 
@@ -9954,6 +10067,11 @@ void __init sched_init(void)
 	BUG_ON(&dl_sched_class != &stop_sched_class + 1);
 #endif
 
+#ifdef CONFIG_SCHED_BORE
+	sched_init_bore();
+	printk(KERN_INFO "BORE (Burst-Oriented Response Enhancer) CPU Scheduler modification 3.0 Beta2 by Masahito Suzuki");
+#endif // CONFIG_SCHED_BORE
+
 	wait_bit_init();
 
 #ifdef CONFIG_FAIR_GROUP_SCHED
diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index e7e83181fbb6..ff41a524c1ee 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -348,6 +348,7 @@ static __init int sched_init_debug(void)
 #endif
 
 	debugfs_create_u32("base_slice_ns", 0644, debugfs_sched, &sysctl_sched_base_slice);
+	debugfs_create_u32("wakeup_granularity_ns", 0644, debugfs_sched, &sysctl_sched_wakeup_granularity);
 
 	debugfs_create_u32("latency_warn_ms", 0644, debugfs_sched, &sysctl_resched_latency_warn_ms);
 	debugfs_create_u32("latency_warn_once", 0644, debugfs_sched, &sysctl_resched_latency_warn_once);
@@ -594,6 +595,9 @@ print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
 		SPLIT_NS(schedstat_val_or_zero(p->stats.sum_sleep_runtime)),
 		SPLIT_NS(schedstat_val_or_zero(p->stats.sum_block_runtime)));
 
+#ifdef CONFIG_SCHED_BORE
+	SEQ_printf(m, " %2d", ((x16*)&p->se.burst_penalty)->u8[1]);
+#endif
 #ifdef CONFIG_NUMA_BALANCING
 	SEQ_printf(m, " %d %d", task_node(p), task_numa_group_id(p));
 #endif
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 461409c0eac7..90ce27fb0a3f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -19,6 +19,9 @@
  *
  *  Adaptive scheduling granularity, math enhancements by Peter Zijlstra
  *  Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
+ *
+ *  Burst-Oriented Response Enhancer (BORE) CPU Scheduler
+ *  Copyright (C) 2021-2023 Masahito Suzuki <firelzrd@gmail.com>
  */
 #include <linux/energy_model.h>
 #include <linux/mmap_lock.h>
@@ -66,17 +69,17 @@
  *   SCHED_TUNABLESCALING_LOG - scaled logarithmical, *1+ilog(ncpus)
  *   SCHED_TUNABLESCALING_LINEAR - scaled linear, *ncpus
  *
- * (default SCHED_TUNABLESCALING_LOG = *(1+ilog(ncpus))
+ * (default SCHED_TUNABLESCALING_NONE = *1)
  */
-unsigned int sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_LOG;
+unsigned int sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 
 /*
  * Minimal preemption granularity for CPU-bound tasks:
  *
- * (default: 0.75 msec * (1 + ilog(ncpus)), units: nanoseconds)
+ * (default: 3 msec * 1, units: nanoseconds)
  */
-unsigned int sysctl_sched_base_slice			= 750000ULL;
-static unsigned int normalized_sysctl_sched_base_slice	= 750000ULL;
+unsigned int sysctl_sched_base_slice			= 3000000ULL;
+static unsigned int normalized_sysctl_sched_base_slice	= 3000000ULL;
 
 /*
  * After fork, child runs first. If set to 0 (default) then
@@ -84,8 +87,93 @@ static unsigned int normalized_sysctl_sched_base_slice	= 750000ULL;
  */
 unsigned int sysctl_sched_child_runs_first __read_mostly;
 
+/*
+ * SCHED_OTHER wake-up granularity.
+ *
+ * This option delays the preemption effects of decoupled workloads
+ * and reduces their over-scheduling. Synchronous workloads will still
+ * have immediate wakeup/sleep latencies.
+ *
+ * (default: 1.6 msec * 1, units: nanoseconds)
+ */
+unsigned int sysctl_sched_wakeup_granularity			= 1600000UL;
+static unsigned int normalized_sysctl_sched_wakeup_granularity	= 1600000UL;
+
 const_debug unsigned int sysctl_sched_migration_cost	= 500000UL;
 
+#ifdef CONFIG_SCHED_BORE
+unsigned int __read_mostly sched_bore                  = 1;
+unsigned int __read_mostly sched_burst_cache_lifetime  = 60000000;
+unsigned int __read_mostly sched_burst_penalty_offset  = 18;
+unsigned int __read_mostly sched_burst_penalty_scale   = 1292;
+unsigned int __read_mostly sched_burst_smoothness_up   = 1;
+unsigned int __read_mostly sched_burst_smoothness_down = 0;
+unsigned int __read_mostly sched_burst_fork_atavistic  = 2;
+static int three          = 3;
+static int sixty_four     = 64;
+static int maxval_12_bits = 4095;
+
+#define MAX_BURST_PENALTY ((u32)(40UL << 8) - 1)
+
+static inline u32 log2plus1_u64_u32f8(u64 v) {
+	x32 result;
+	int msb = fls64(v);
+	result.u8[0] = v << (64 - msb) >> 55;
+	result.u8[1] = msb;
+	return result.u32;
+}
+
+static inline u32 u8h_u32(u8 v) {
+	x32 result;
+	result.u8[1] = v;
+	return result.u32;
+}
+
+static inline u32 calc_burst_penalty(struct sched_entity *se) {
+	u32 greed, tolerance, penalty, scaled_penalty;
+	
+	greed = log2plus1_u64_u32f8(se->burst_time);
+	tolerance = u8h_u32(sched_burst_penalty_offset);
+	penalty = max(0, (s32)greed - (s32)tolerance);
+	scaled_penalty = penalty * sched_burst_penalty_scale >> 10;
+
+	return min(MAX_BURST_PENALTY, scaled_penalty);
+}
+
+static void update_burst_penalty(struct sched_entity *se) {
+	se->curr_burst_penalty = calc_burst_penalty(se);
+	se->burst_penalty = max(se->prev_burst_penalty, se->curr_burst_penalty);
+}
+
+static inline u64 penalty_scale(u64 delta, struct sched_entity *se) {
+	u8 score = ((x16*)&se->burst_penalty)->u8[1];
+	return mul_u64_u32_shr(delta, sched_prio_to_wmult[score], 22);
+}
+
+static inline u32 binary_smooth(u32 new, u32 old) {
+  return (new >= old)?
+    old + ((new - old) >> sched_burst_smoothness_up):
+    old - ((old - new) >> sched_burst_smoothness_down);
+}
+
+static void restart_burst(struct sched_entity *se) {
+	se->burst_penalty = se->prev_burst_penalty =
+		binary_smooth(se->curr_burst_penalty, se->prev_burst_penalty);
+	se->curr_burst_penalty = 0;
+	se->burst_time = 0;
+}
+
+#define calc_delta_fair(delta, se) __calc_delta_fair(delta, se, true)
+#define calc_delta_fair_unscaled(delta, se) __calc_delta_fair(delta, se, false)
+static inline u64 
+__calc_delta_fair(u64 delta, struct sched_entity *se, bool bscale);
+
+static s64 wakeup_preempt_backstep_delta(u64 rtime, struct sched_entity *se) {
+	u64 delta = calc_delta_fair_unscaled(rtime, se);
+	return delta - penalty_scale(delta, se);
+}
+#endif // CONFIG_SCHED_BORE
+
 int sched_thermal_decay_shift;
 static int __init setup_sched_thermal_decay_shift(char *str)
 {
@@ -145,6 +233,69 @@ static unsigned int sysctl_numa_balancing_promote_rate_limit = 65536;
 
 #ifdef CONFIG_SYSCTL
 static struct ctl_table sched_fair_sysctls[] = {
+#ifdef CONFIG_SCHED_BORE
+	{
+		.procname	= "sched_bore",
+		.data		= &sched_bore,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
+	{
+		.procname	= "sched_burst_cache_lifetime",
+		.data		= &sched_burst_cache_lifetime,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler = proc_dointvec,
+	},
+	{
+		.procname	= "sched_burst_fork_atavistic",
+		.data		= &sched_burst_fork_atavistic,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= &three,
+	},
+	{
+		.procname	= "sched_burst_penalty_offset",
+		.data		= &sched_burst_penalty_offset,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= &sixty_four,
+	},
+	{
+		.procname	= "sched_burst_penalty_scale",
+		.data		= &sched_burst_penalty_scale,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= &maxval_12_bits,
+	},
+	{
+		.procname	= "sched_burst_smoothness_down",
+		.data		= &sched_burst_smoothness_down,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= &three,
+	},
+	{
+		.procname	= "sched_burst_smoothness_up",
+		.data		= &sched_burst_smoothness_up,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= &three,
+	},
+#endif // CONFIG_SCHED_BORE
 	{
 		.procname       = "sched_child_runs_first",
 		.data           = &sysctl_sched_child_runs_first,
@@ -238,6 +389,7 @@ static void update_sysctl(void)
 #define SET_SYSCTL(name) \
 	(sysctl_##name = (factor) * normalized_sysctl_##name)
 	SET_SYSCTL(sched_base_slice);
+	SET_SYSCTL(sched_wakeup_granularity);
 #undef SET_SYSCTL
 }
 
@@ -308,11 +460,19 @@ static u64 __calc_delta(u64 delta_exec, unsigned long weight, struct load_weight
 /*
  * delta /= w
  */
+#ifdef CONFIG_SCHED_BORE
+static inline u64 
+__calc_delta_fair(u64 delta, struct sched_entity *se, bool bscale)
+#else // CONFIG_SCHED_BORE
 static inline u64 calc_delta_fair(u64 delta, struct sched_entity *se)
+#endif // CONFIG_SCHED_BORE
 {
 	if (unlikely(se->load.weight != NICE_0_LOAD))
 		delta = __calc_delta(delta, NICE_0_LOAD, &se->load);
 
+#ifdef CONFIG_SCHED_BORE
+	if (bscale && likely(sched_bore)) delta = penalty_scale(delta, se);
+#endif // CONFIG_SCHED_BORE
 	return delta;
 }
 
@@ -706,7 +866,11 @@ void update_entity_lag(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	SCHED_WARN_ON(!se->on_rq);
 	lag = avg_vruntime(cfs_rq) - se->vruntime;
 
+#ifdef CONFIG_SCHED_BORE
+	limit = calc_delta_fair_unscaled(max_t(u64, 2*se->slice, TICK_NSEC), se);
+#else // CONFIG_SCHED_BORE
 	limit = calc_delta_fair(max_t(u64, 2*se->slice, TICK_NSEC), se);
+#endif // CONFIG_SCHED_BORE
 	se->vlag = clamp(lag, -limit, limit);
 }
 
@@ -944,6 +1108,7 @@ int sched_update_scaling(void)
 #define WRT_SYSCTL(name) \
 	(normalized_sysctl_##name = sysctl_##name / (factor))
 	WRT_SYSCTL(sched_base_slice);
+	WRT_SYSCTL(sched_wakeup_granularity);
 #undef WRT_SYSCTL
 
 	return 0;
@@ -1121,6 +1286,10 @@ static void update_curr(struct cfs_rq *cfs_rq)
 	curr->sum_exec_runtime += delta_exec;
 	schedstat_add(cfs_rq->exec_clock, delta_exec);
 
+#ifdef CONFIG_SCHED_BORE
+	curr->burst_time += delta_exec;
+	update_burst_penalty(curr);
+#endif // CONFIG_SCHED_BORE
 	curr->vruntime += calc_delta_fair(delta_exec, curr);
 	update_deadline(cfs_rq, curr);
 	update_min_vruntime(cfs_rq);
@@ -5187,6 +5356,9 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	se->prev_sum_exec_runtime = se->sum_exec_runtime;
 }
 
+static int
+wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se);
+
 /*
  * Pick the next process, keeping these things in mind, in this order:
  * 1) keep things fair between processes/task groups
@@ -5197,14 +5369,16 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se)
 static struct sched_entity *
 pick_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *curr)
 {
+	struct sched_entity *candidate = pick_eevdf(cfs_rq);
 	/*
 	 * Enabling NEXT_BUDDY will affect latency but not fairness.
 	 */
 	if (sched_feat(NEXT_BUDDY) &&
-	    cfs_rq->next && entity_eligible(cfs_rq, cfs_rq->next))
+	    cfs_rq->next && entity_eligible(cfs_rq, cfs_rq->next) && 
+			wakeup_preempt_entity(cfs_rq->next, candidate) < 1)
 		return cfs_rq->next;
 
-	return pick_eevdf(cfs_rq);
+	return candidate;
 }
 
 static bool check_cfs_rq_runtime(struct cfs_rq *cfs_rq);
@@ -6452,6 +6626,38 @@ enqueue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 	hrtick_update(rq);
 }
 
+static unsigned long wakeup_gran(struct sched_entity *se)
+{
+	unsigned long gran = sysctl_sched_wakeup_granularity;
+#ifdef CONFIG_SCHED_BORE
+	return calc_delta_fair_unscaled(gran, se);
+#else // CONFIG_SCHED_BORE
+	return calc_delta_fair(gran, se);
+#endif // CONFIG_SCHED_BORE
+}
+
+static int
+wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
+{
+	s64 gran, vdiff = curr->vruntime - se->vruntime;
+#ifdef CONFIG_SCHED_BORE
+	if (likely(sched_bore)) {
+		u64 rtime = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
+		vdiff += wakeup_preempt_backstep_delta(rtime, curr)
+		       - wakeup_preempt_backstep_delta(rtime, se);
+	}
+#endif // CONFIG_SCHED_BORE
+
+	if (vdiff <= 0)
+		return -1;
+
+	gran = wakeup_gran(se);
+	if (vdiff > gran)
+		return 1;
+
+	return 0;
+}
+
 static void set_next_buddy(struct sched_entity *se);
 
 /*
@@ -6470,6 +6676,9 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 	util_est_dequeue(&rq->cfs, p);
 
 	for_each_sched_entity(se) {
+#ifdef CONFIG_SCHED_BORE
+		if (task_sleep) restart_burst(se);
+#endif // CONFIG_SCHED_BORE
 		cfs_rq = cfs_rq_of(se);
 		dequeue_entity(cfs_rq, se, flags);
 
@@ -7980,7 +8189,7 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int wake_
 	/*
 	 * XXX pick_eevdf(cfs_rq) != se ?
 	 */
-	if (pick_eevdf(cfs_rq) == pse)
+	if ((pick_eevdf(cfs_rq) == pse) && (wakeup_preempt_entity(se, pse) == 1))
 		goto preempt;
 
 	return;
@@ -8193,6 +8402,9 @@ static void yield_task_fair(struct rq *rq)
 	struct task_struct *curr = rq->curr;
 	struct cfs_rq *cfs_rq = task_cfs_rq(curr);
 	struct sched_entity *se = &curr->se;
+#ifdef CONFIG_SCHED_BORE
+	restart_burst(se);
+#endif // CONFIG_SCHED_BORE
 
 	/*
 	 * Are we the only task in the tree?
diff --git a/kernel/sched/features.h b/kernel/sched/features.h
index 54334ca5c5c6..416ec4bcdb0f 100644
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h
@@ -12,7 +12,11 @@ SCHED_FEAT(PLACE_DEADLINE_INITIAL, true)
  * wakeup-preemption), since its likely going to consume data we
  * touched, increases cache locality.
  */
+#ifdef CONFIG_SCHED_BORE
+SCHED_FEAT(NEXT_BUDDY, true)
+#else // CONFIG_SCHED_BORE
 SCHED_FEAT(NEXT_BUDDY, false)
+#endif // CONFIG_SCHED_BORE
 
 /*
  * Consider buddies to be cache hot, decreases the likeliness of a
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 67cd7e1fd501..04d065015d6c 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2506,6 +2506,7 @@ extern const_debug unsigned int sysctl_sched_nr_migrate;
 extern const_debug unsigned int sysctl_sched_migration_cost;
 
 extern unsigned int sysctl_sched_base_slice;
+extern unsigned int sysctl_sched_wakeup_granularity;
 
 #ifdef CONFIG_SCHED_DEBUG
 extern int sysctl_resched_latency_warn_ms;
-- 
2.41.0