0001.bore.patch

From 7b64bc1c38de007889e49778b50de20e79277ef5 Mon Sep 17 00:00:00 2001
From: bigshans <26884666+bigshans@users.noreply.github.com>
Date: Thu, 30 Jan 2025 19:36:59 +0800
Subject: [PATCH] bore

---
 include/linux/sched.h      |  18 ++
 include/linux/sched/bore.h |  40 ++++
 init/Kconfig               |  17 ++
 kernel/Kconfig.hz          |  17 ++
 kernel/fork.c              |   6 +
 kernel/sched/Makefile      |   1 +
 kernel/sched/bore.c        | 443 +++++++++++++++++++++++++++++++++++++
 kernel/sched/core.c        |   6 +
 kernel/sched/debug.c       |  61 ++++-
 kernel/sched/fair.c        |  79 ++++++-
 kernel/sched/sched.h       |   9 +
 11 files changed, 689 insertions(+), 8 deletions(-)
 create mode 100644 include/linux/sched/bore.h
 create mode 100644 kernel/sched/bore.c

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 64934e083..7ec02a323 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -538,6 +538,15 @@ struct sched_statistics {
 #endif /* CONFIG_SCHEDSTATS */
 } ____cacheline_aligned;
 
+#ifdef CONFIG_SCHED_BORE
+struct sched_burst_cache {
+	u8				score;
+	u32				count;
+	u64				timestamp;
+    spinlock_t		lock;
+};
+#endif // CONFIG_SCHED_BORE
+
 struct sched_entity {
 	/* For load-balancing: */
 	struct load_weight		load;
@@ -557,6 +566,15 @@ struct sched_entity {
 	u64				sum_exec_runtime;
 	u64				prev_sum_exec_runtime;
 	u64				vruntime;
+#ifdef CONFIG_SCHED_BORE
+	u64				burst_time;
+	u8				prev_burst_penalty;
+	u8				curr_burst_penalty;
+	u8				burst_penalty;
+	u8				burst_score;
+	struct sched_burst_cache child_burst;
+	struct sched_burst_cache group_burst;
+#endif // CONFIG_SCHED_BORE
 	s64				vlag;
 	u64				slice;
 
diff --git a/include/linux/sched/bore.h b/include/linux/sched/bore.h
new file mode 100644
index 000000000..a8faabc28
--- /dev/null
+++ b/include/linux/sched/bore.h
@@ -0,0 +1,40 @@
+
+#include <linux/sched.h>
+#include <linux/sched/cputime.h>
+
+#ifndef _LINUX_SCHED_BORE_H
+#define _LINUX_SCHED_BORE_H
+#define SCHED_BORE_VERSION "5.9.6"
+
+#ifdef CONFIG_SCHED_BORE
+extern u8   __read_mostly sched_bore;
+extern u8   __read_mostly sched_burst_exclude_kthreads;
+extern u8   __read_mostly sched_burst_smoothness_long;
+extern u8   __read_mostly sched_burst_smoothness_short;
+extern u8   __read_mostly sched_burst_fork_atavistic;
+extern u8   __read_mostly sched_burst_parity_threshold;
+extern u8   __read_mostly sched_burst_penalty_offset;
+extern uint __read_mostly sched_burst_penalty_scale;
+extern uint __read_mostly sched_burst_cache_stop_count;
+extern uint __read_mostly sched_burst_cache_lifetime;
+extern uint __read_mostly sched_deadline_boost_mask;
+
+extern void update_burst_score(struct sched_entity *se);
+extern void update_burst_penalty(struct sched_entity *se);
+
+extern void restart_burst(struct sched_entity *se);
+extern void restart_burst_rescale_deadline(struct sched_entity *se);
+
+extern int sched_bore_update_handler(const struct ctl_table *table, int write,
+	void __user *buffer, size_t *lenp, loff_t *ppos);
+
+extern void sched_clone_bore(
+	struct task_struct *p, struct task_struct *parent, u64 clone_flags, u64 now);
+
+extern void reset_task_bore(struct task_struct *p);
+extern void sched_bore_init(void);
+
+extern void reweight_entity(
+	struct cfs_rq *cfs_rq, struct sched_entity *se, unsigned long weight);
+#endif // CONFIG_SCHED_BORE
+#endif // _LINUX_SCHED_BORE_H
diff --git a/init/Kconfig b/init/Kconfig
index 08fb88f81..7ccb52826 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1342,6 +1342,23 @@ 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.
+
+	  If unsure, say Y here.
+
 config SCHED_AUTOGROUP
 	bool "Automatic process group scheduling"
 	select CGROUPS
diff --git a/kernel/Kconfig.hz b/kernel/Kconfig.hz
index 0ff51d4d2..2cd972d50 100644
--- a/kernel/Kconfig.hz
+++ b/kernel/Kconfig.hz
@@ -63,5 +63,22 @@ config HZ
 	default 500 if HZ_500
 	default 1000 if HZ_1000
 
+config MIN_BASE_SLICE_NS
+	int "Default value for min_base_slice_ns"
+	default 2000000
+	help
+	 The BORE Scheduler automatically calculates the optimal base
+	 slice for the configured HZ using the following equation:
+	 
+	 base_slice_ns =
+	 	1000000000/HZ * DIV_ROUNDUP(min_base_slice_ns, 1000000000/HZ)
+	 
+	 This option sets the default lower bound limit of the base slice
+	 to prevent the loss of task throughput due to overscheduling.
+	 
+	 Setting this value too high can cause the system to boot with
+	 an unnecessarily large base slice, resulting in high scheduling
+	 latency and poor system responsiveness.
+
 config SCHED_HRTICK
 	def_bool HIGH_RES_TIMERS
diff --git a/kernel/fork.c b/kernel/fork.c
index e212e3ae8..77901fca0 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -112,6 +112,8 @@
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
 
+#include <linux/sched/bore.h>
+
 #include <trace/events/sched.h>
 
 #define CREATE_TRACE_POINTS
@@ -2525,6 +2527,10 @@ __latent_entropy struct task_struct *copy_process(
 	p->start_time = ktime_get_ns();
 	p->start_boottime = ktime_get_boottime_ns();
 
+#ifdef CONFIG_SCHED_BORE
+	if (likely(p->pid))
+		sched_clone_bore(p, current, clone_flags, p->start_time);
+#endif // CONFIG_SCHED_BORE
 	/*
 	 * Make it visible to the rest of the system, but dont wake it up yet.
 	 * Need tasklist lock for parent etc handling!
diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile
index 976092b7b..293aad675 100644
--- a/kernel/sched/Makefile
+++ b/kernel/sched/Makefile
@@ -32,3 +32,4 @@ obj-y += core.o
 obj-y += fair.o
 obj-y += build_policy.o
 obj-y += build_utility.o
+obj-y += bore.o
diff --git a/kernel/sched/bore.c b/kernel/sched/bore.c
new file mode 100644
index 000000000..23aeb5649
--- /dev/null
+++ b/kernel/sched/bore.c
@@ -0,0 +1,443 @@
+/*
+ *  Burst-Oriented Response Enhancer (BORE) CPU Scheduler
+ *  Copyright (C) 2021-2024 Masahito Suzuki <firelzrd@gmail.com>
+ */
+#include <linux/cpuset.h>
+#include <linux/sched/task.h>
+#include <linux/sched/bore.h>
+#include "sched.h"
+
+#ifdef CONFIG_SCHED_BORE
+u8   __read_mostly sched_bore                   = 1;
+u8   __read_mostly sched_burst_exclude_kthreads = 1;
+u8   __read_mostly sched_burst_smoothness_long  = 1;
+u8   __read_mostly sched_burst_smoothness_short = 0;
+u8   __read_mostly sched_burst_fork_atavistic   = 2;
+u8   __read_mostly sched_burst_parity_threshold = 2;
+u8   __read_mostly sched_burst_penalty_offset   = 24;
+uint __read_mostly sched_burst_penalty_scale    = 1280;
+uint __read_mostly sched_burst_cache_stop_count = 64;
+uint __read_mostly sched_burst_cache_lifetime   = 75000000;
+uint __read_mostly sched_deadline_boost_mask    = ENQUEUE_INITIAL
+                                                | ENQUEUE_WAKEUP;
+static int __maybe_unused sixty_four     = 64;
+static int __maybe_unused maxval_u8      = 255;
+static int __maybe_unused maxval_12_bits = 4095;
+
+#define MAX_BURST_PENALTY (39U <<2)
+
+static inline u32 log2plus1_u64_u32f8(u64 v) {
+	u32 integral = fls64(v);
+	u8  fractional = v << (64 - integral) >> 55;
+	return integral << 8 | fractional;
+}
+
+static inline u32 calc_burst_penalty(u64 burst_time) {
+	u32 greed, tolerance, penalty, scaled_penalty;
+	
+	greed = log2plus1_u64_u32f8(burst_time);
+	tolerance = sched_burst_penalty_offset << 8;
+	penalty = max(0, (s32)(greed - tolerance));
+	scaled_penalty = penalty * sched_burst_penalty_scale >> 16;
+
+	return min(MAX_BURST_PENALTY, scaled_penalty);
+}
+
+static inline u64 __scale_slice(u64 delta, u8 score)
+{return mul_u64_u32_shr(delta, sched_prio_to_wmult[score], 22);}
+
+static inline u64 __unscale_slice(u64 delta, u8 score)
+{return mul_u64_u32_shr(delta, sched_prio_to_weight[score], 10);}
+
+static void reweight_task_by_prio(struct task_struct *p, int prio) {
+	struct sched_entity *se = &p->se;
+	unsigned long weight = scale_load(sched_prio_to_weight[prio]);
+
+	reweight_entity(cfs_rq_of(se), se, weight);
+	se->load.inv_weight = sched_prio_to_wmult[prio];
+}
+
+static inline u8 effective_prio(struct task_struct *p) {
+	u8 prio = p->static_prio - MAX_RT_PRIO;
+	if (likely(sched_bore))
+		prio += p->se.burst_score;
+	return min(39, prio);
+}
+
+void update_burst_score(struct sched_entity *se) {
+	if (!entity_is_task(se)) return;
+	struct task_struct *p = task_of(se);
+	u8 prev_prio = effective_prio(p);
+
+	u8 burst_score = 0;
+	if (!((p->flags & PF_KTHREAD) && likely(sched_burst_exclude_kthreads)))
+		burst_score = se->burst_penalty >> 2;
+	se->burst_score = burst_score;
+
+	u8 new_prio = effective_prio(p);
+	if (new_prio != prev_prio)
+		reweight_task_by_prio(p, new_prio);
+}
+
+void update_burst_penalty(struct sched_entity *se) {
+	se->curr_burst_penalty = calc_burst_penalty(se->burst_time);
+	se->burst_penalty = max(se->prev_burst_penalty, se->curr_burst_penalty);
+	update_burst_score(se);
+}
+
+static inline u32 binary_smooth(u32 new, u32 old) {
+	int increment = new - old;
+	return (0 <= increment)?
+		old + ( increment >> (int)sched_burst_smoothness_long):
+		old - (-increment >> (int)sched_burst_smoothness_short);
+}
+
+static void revolve_burst_penalty(struct sched_entity *se) {
+	se->prev_burst_penalty =
+		binary_smooth(se->curr_burst_penalty, se->prev_burst_penalty);
+	se->burst_time = 0;
+	se->curr_burst_penalty = 0;
+}
+
+inline void restart_burst(struct sched_entity *se) {
+	revolve_burst_penalty(se);
+	se->burst_penalty = se->prev_burst_penalty;
+	update_burst_score(se);
+}
+
+void restart_burst_rescale_deadline(struct sched_entity *se) {
+	s64 vscaled, wremain, vremain = se->deadline - se->vruntime;
+	struct task_struct *p = task_of(se);
+	u8 prev_prio = effective_prio(p);
+	restart_burst(se);
+	u8 new_prio = effective_prio(p);
+	if (prev_prio > new_prio) {
+		wremain = __unscale_slice(abs(vremain), prev_prio);
+		vscaled = __scale_slice(wremain, new_prio);
+		if (unlikely(vremain < 0))
+			vscaled = -vscaled;
+		se->deadline = se->vruntime + vscaled;
+	}
+}
+
+static inline bool task_is_bore_eligible(struct task_struct *p)
+{return p && p->sched_class == &fair_sched_class && !p->exit_state;}
+
+static void reset_task_weights_bore(void) {
+	struct task_struct *task;
+	struct rq *rq;
+	struct rq_flags rf;
+
+	write_lock_irq(&tasklist_lock);
+	for_each_process(task) {
+		if (!task_is_bore_eligible(task)) continue;
+		rq = task_rq(task);
+		rq_pin_lock(rq, &rf);
+		update_rq_clock(rq);
+		reweight_task_by_prio(task, effective_prio(task));
+		rq_unpin_lock(rq, &rf);
+	}
+	write_unlock_irq(&tasklist_lock);
+}
+
+int sched_bore_update_handler(const struct ctl_table *table, int write,
+	void __user *buffer, size_t *lenp, loff_t *ppos) {
+	int ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
+	if (ret || !write)
+		return ret;
+
+	reset_task_weights_bore();
+
+	return 0;
+}
+
+#define for_each_child(p, t) \
+	list_for_each_entry(t, &(p)->children, sibling)
+
+static u32 count_entries_upto2(struct list_head *head) {
+	struct list_head *next = head->next;
+	return (next != head) + (next->next != head);
+}
+
+static inline void init_task_burst_cache_lock(struct task_struct *p) {
+	spin_lock_init(&p->se.child_burst.lock);
+	spin_lock_init(&p->se.group_burst.lock);
+}
+
+static inline bool burst_cache_expired(struct sched_burst_cache *bc, u64 now)
+{return (s64)(bc->timestamp + sched_burst_cache_lifetime - now) < 0;}
+
+static void update_burst_cache(struct sched_burst_cache *bc,
+	struct task_struct *p, u32 cnt, u32 sum, u64 now) {
+	u8 avg = cnt ? sum / cnt : 0;
+	bc->score = max(avg, p->se.burst_penalty);
+	bc->count = cnt;
+	bc->timestamp = now;
+}
+
+static inline void update_child_burst_direct(struct task_struct *p, u64 now) {
+	u32 cnt = 0, sum = 0;
+	struct task_struct *child;
+
+	for_each_child(p, child) {
+		if (!task_is_bore_eligible(child)) continue;
+		cnt++;
+		sum += child->se.burst_penalty;
+	}
+
+	update_burst_cache(&p->se.child_burst, p, cnt, sum, now);
+}
+
+static inline u8 inherit_burst_direct(
+	struct task_struct *p, u64 now, u64 clone_flags) {
+	struct task_struct *parent = p;
+	struct sched_burst_cache *bc;
+
+	if (clone_flags & CLONE_PARENT)
+		parent = parent->real_parent;
+
+	bc = &parent->se.child_burst;
+	guard(spinlock)(&bc->lock);
+	if (burst_cache_expired(bc, now))
+		update_child_burst_direct(parent, now);
+
+	return bc->score;
+}
+
+static void update_child_burst_topological(
+	struct task_struct *p, u64 now, u32 depth, u32 *acnt, u32 *asum) {
+	u32 cnt = 0, dcnt = 0, sum = 0;
+	struct task_struct *child, *dec;
+	struct sched_burst_cache *bc __maybe_unused;
+
+	for_each_child(p, child) {
+		dec = child;
+		while ((dcnt = count_entries_upto2(&dec->children)) == 1)
+			dec = list_first_entry(&dec->children, struct task_struct, sibling);
+		
+		if (!dcnt || !depth) {
+			if (!task_is_bore_eligible(dec)) continue;
+			cnt++;
+			sum += dec->se.burst_penalty;
+			continue;
+		}
+		bc = &dec->se.child_burst;
+		spin_lock(&bc->lock);
+		if (!burst_cache_expired(bc, now)) {
+			cnt += bc->count;
+			sum += (u32)bc->score * bc->count;
+			if (sched_burst_cache_stop_count <= cnt) {
+				spin_unlock(&bc->lock);
+				break;
+			}
+			spin_unlock(&bc->lock);
+			continue;
+		}
+		update_child_burst_topological(dec, now, depth - 1, &cnt, &sum);
+		spin_unlock(&bc->lock);
+	}
+
+	update_burst_cache(&p->se.child_burst, p, cnt, sum, now);
+	*acnt += cnt;
+	*asum += sum;
+}
+
+static inline u8 inherit_burst_topological(
+	struct task_struct *p, u64 now, u64 clone_flags) {
+	struct task_struct *anc = p;
+	struct sched_burst_cache *bc;
+	u32 cnt = 0, sum = 0;
+	u32 base_child_cnt = 0;
+
+	if (clone_flags & CLONE_PARENT) {
+		anc = anc->real_parent;
+		base_child_cnt = 1;
+	}
+
+	for (struct task_struct *next;
+		 anc != (next = anc->real_parent) &&
+		 	count_entries_upto2(&anc->children) <= base_child_cnt;) {
+		anc = next;
+		base_child_cnt = 1;
+	}
+
+	bc = &anc->se.child_burst;
+	guard(spinlock)(&bc->lock);
+	if (burst_cache_expired(bc, now))
+		update_child_burst_topological(
+			anc, now, sched_burst_fork_atavistic - 1, &cnt, &sum);
+
+	return bc->score;
+}
+
+static inline void update_tg_burst(struct task_struct *p, u64 now) {
+	struct task_struct *task;
+	u32 cnt = 0, sum = 0;
+
+	for_each_thread(p, task) {
+		if (!task_is_bore_eligible(task)) continue;
+		cnt++;
+		sum += task->se.burst_penalty;
+	}
+
+	update_burst_cache(&p->se.group_burst, p, cnt, sum, now);
+}
+
+static inline u8 inherit_burst_tg(struct task_struct *p, u64 now) {
+	struct task_struct *parent = rcu_dereference(p->group_leader);
+	struct sched_burst_cache *bc = &parent->se.group_burst;
+	guard(spinlock)(&bc->lock);
+	if (burst_cache_expired(bc, now))
+		update_tg_burst(parent, now);
+
+	return bc->score;
+}
+
+void sched_clone_bore(struct task_struct *p,
+	struct task_struct *parent, u64 clone_flags, u64 now) {
+	struct sched_entity *se = &p->se;
+	u8 penalty;
+
+	init_task_burst_cache_lock(p);
+
+	if (!task_is_bore_eligible(p)) return;
+
+	if (clone_flags & CLONE_THREAD) {
+		rcu_read_lock();
+		penalty = inherit_burst_tg(parent, now);
+		rcu_read_unlock();
+	} else {
+		read_lock(&tasklist_lock);
+		penalty = likely(sched_burst_fork_atavistic) ?
+			inherit_burst_topological(parent, now, clone_flags):
+			inherit_burst_direct(parent, now, clone_flags);
+		read_unlock(&tasklist_lock);
+	}
+
+	revolve_burst_penalty(se);
+	se->burst_penalty = se->prev_burst_penalty =
+		max(se->prev_burst_penalty, penalty);
+	se->child_burst.timestamp = 0;
+	se->group_burst.timestamp = 0;
+}
+
+void reset_task_bore(struct task_struct *p) {
+	p->se.burst_time = 0;
+	p->se.prev_burst_penalty = 0;
+	p->se.curr_burst_penalty = 0;
+	p->se.burst_penalty = 0;
+	p->se.burst_score = 0;
+	memset(&p->se.child_burst, 0, sizeof(struct sched_burst_cache));
+	memset(&p->se.group_burst, 0, sizeof(struct sched_burst_cache));
+}
+
+void __init sched_bore_init(void) {
+	printk(KERN_INFO "BORE (Burst-Oriented Response Enhancer) CPU Scheduler modification %s by Masahito Suzuki", SCHED_BORE_VERSION);
+	reset_task_bore(&init_task);
+	init_task_burst_cache_lock(&init_task);
+}
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table sched_bore_sysctls[] = {
+	{
+		.procname	= "sched_bore",
+		.data		= &sched_bore,
+		.maxlen		= sizeof(u8),
+		.mode		= 0644,
+		.proc_handler = sched_bore_update_handler,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
+	{
+		.procname	= "sched_burst_exclude_kthreads",
+		.data		= &sched_burst_exclude_kthreads,
+		.maxlen		= sizeof(u8),
+		.mode		= 0644,
+		.proc_handler = proc_dou8vec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
+	{
+		.procname	= "sched_burst_smoothness_long",
+		.data		= &sched_burst_smoothness_long,
+		.maxlen		= sizeof(u8),
+		.mode		= 0644,
+		.proc_handler = proc_dou8vec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
+	{
+		.procname	= "sched_burst_smoothness_short",
+		.data		= &sched_burst_smoothness_short,
+		.maxlen		= sizeof(u8),
+		.mode		= 0644,
+		.proc_handler = proc_dou8vec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_ONE,
+	},
+	{
+		.procname	= "sched_burst_fork_atavistic",
+		.data		= &sched_burst_fork_atavistic,
+		.maxlen		= sizeof(u8),
+		.mode		= 0644,
+		.proc_handler = proc_dou8vec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= SYSCTL_THREE,
+	},
+	{
+		.procname	= "sched_burst_parity_threshold",
+		.data		= &sched_burst_parity_threshold,
+		.maxlen		= sizeof(u8),
+		.mode		= 0644,
+		.proc_handler = proc_dou8vec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= &maxval_u8,
+	},
+	{
+		.procname	= "sched_burst_penalty_offset",
+		.data		= &sched_burst_penalty_offset,
+		.maxlen		= sizeof(u8),
+		.mode		= 0644,
+		.proc_handler = proc_dou8vec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= &sixty_four,
+	},
+	{
+		.procname	= "sched_burst_penalty_scale",
+		.data		= &sched_burst_penalty_scale,
+		.maxlen		= sizeof(uint),
+		.mode		= 0644,
+		.proc_handler = proc_douintvec_minmax,
+		.extra1		= SYSCTL_ZERO,
+		.extra2		= &maxval_12_bits,
+	},
+	{
+		.procname	= "sched_burst_cache_stop_count",
+		.data		= &sched_burst_cache_stop_count,
+		.maxlen		= sizeof(uint),
+		.mode		= 0644,
+		.proc_handler = proc_douintvec,
+	},
+	{
+		.procname	= "sched_burst_cache_lifetime",
+		.data		= &sched_burst_cache_lifetime,
+		.maxlen		= sizeof(uint),
+		.mode		= 0644,
+		.proc_handler = proc_douintvec,
+	},
+	{
+		.procname	= "sched_deadline_boost_mask",
+		.data		= &sched_deadline_boost_mask,
+		.maxlen		= sizeof(uint),
+		.mode		= 0644,
+		.proc_handler = proc_douintvec,
+	},
+};
+
+static int __init sched_bore_sysctl_init(void) {
+	register_sysctl_init("kernel", sched_bore_sysctls);
+	return 0;
+}
+late_initcall(sched_bore_sysctl_init);
+#endif // CONFIG_SYSCTL
+#endif // CONFIG_SCHED_BORE
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3e5a6bf58..fb4bb3fa5 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -97,6 +97,8 @@
 #include "../../io_uring/io-wq.h"
 #include "../smpboot.h"
 
+#include <linux/sched/bore.h>
+
 EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_send_cpu);
 EXPORT_TRACEPOINT_SYMBOL_GPL(ipi_send_cpumask);
 
@@ -8481,6 +8483,10 @@ void __init sched_init(void)
 	BUG_ON(!sched_class_above(&ext_sched_class, &idle_sched_class));
 #endif
 
+#ifdef CONFIG_SCHED_BORE
+	sched_bore_init();
+#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 a1be00a98..66fcb2290 100644
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -167,7 +167,53 @@ static const struct file_operations sched_feat_fops = {
 };
 
 #ifdef CONFIG_SMP
+#ifdef CONFIG_SCHED_BORE
+#define DEFINE_SYSCTL_SCHED_FUNC(name, update_func) \
+static ssize_t sched_##name##_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos) \
+{ \
+	char buf[16]; \
+	unsigned int value; \
+\
+	if (cnt > 15) \
+		cnt = 15; \
+\
+	if (copy_from_user(&buf, ubuf, cnt)) \
+		return -EFAULT; \
+	buf[cnt] = '\0'; \
+\
+	if (kstrtouint(buf, 10, &value)) \
+		return -EINVAL; \
+\
+	sysctl_sched_##name = value; \
+	sched_update_##update_func(); \
+\
+	*ppos += cnt; \
+	return cnt; \
+} \
+\
+static int sched_##name##_show(struct seq_file *m, void *v) \
+{ \
+	seq_printf(m, "%d\n", sysctl_sched_##name); \
+	return 0; \
+} \
+\
+static int sched_##name##_open(struct inode *inode, struct file *filp) \
+{ \
+	return single_open(filp, sched_##name##_show, NULL); \
+} \
+\
+static const struct file_operations sched_##name##_fops = { \
+	.open		= sched_##name##_open, \
+	.write		= sched_##name##_write, \
+	.read		= seq_read, \
+	.llseek		= seq_lseek, \
+	.release	= single_release, \
+};
+
+DEFINE_SYSCTL_SCHED_FUNC(min_base_slice, min_base_slice)
 
+#undef DEFINE_SYSCTL_SCHED_FUNC
+#else // !CONFIG_SCHED_BORE
 static ssize_t sched_scaling_write(struct file *filp, const char __user *ubuf,
 				   size_t cnt, loff_t *ppos)
 {
@@ -213,7 +259,7 @@ static const struct file_operations sched_scaling_fops = {
 	.llseek		= seq_lseek,
 	.release	= single_release,
 };
-
+#endif // CONFIG_SCHED_BORE
 #endif /* SMP */
 
 #ifdef CONFIG_PREEMPT_DYNAMIC
@@ -505,13 +551,20 @@ static __init int sched_init_debug(void)
 	debugfs_create_file("preempt", 0644, debugfs_sched, NULL, &sched_dynamic_fops);
 #endif
 
+#ifdef CONFIG_SCHED_BORE
+	debugfs_create_file("min_base_slice_ns", 0644, debugfs_sched, NULL, &sched_min_base_slice_fops);
+	debugfs_create_u32("base_slice_ns", 0444, debugfs_sched, &sysctl_sched_base_slice);
+#else // !CONFIG_SCHED_BORE
 	debugfs_create_u32("base_slice_ns", 0644, debugfs_sched, &sysctl_sched_base_slice);
+#endif // CONFIG_SCHED_BORE
 
 	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);
 
 #ifdef CONFIG_SMP
+#if !defined(CONFIG_SCHED_BORE)
 	debugfs_create_file("tunable_scaling", 0644, debugfs_sched, NULL, &sched_scaling_fops);
+#endif // CONFIG_SCHED_BORE
 	debugfs_create_u32("migration_cost_ns", 0644, debugfs_sched, &sysctl_sched_migration_cost);
 	debugfs_create_u32("nr_migrate", 0644, debugfs_sched, &sysctl_sched_nr_migrate);
 
@@ -756,6 +809,9 @@ 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", p->se.burst_score);
+#endif // CONFIG_SCHED_BORE
 #ifdef CONFIG_NUMA_BALANCING
 	SEQ_printf(m, "   %d      %d", task_node(p), task_numa_group_id(p));
 #endif
@@ -1245,6 +1301,9 @@ void proc_sched_show_task(struct task_struct *p, struct pid_namespace *ns,
 
 	P(se.load.weight);
 #ifdef CONFIG_SMP
+#ifdef CONFIG_SCHED_BORE
+	P(se.burst_score);
+#endif // CONFIG_SCHED_BORE
 	P(se.avg.load_sum);
 	P(se.avg.runnable_sum);
 	P(se.avg.util_sum);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9d6378f64..e6c834e4d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -55,6 +55,8 @@
 #include "stats.h"
 #include "autogroup.h"
 
+#include <linux/sched/bore.h>
+
 /*
  * The initial- and re-scaling of tunables is configurable
  *
@@ -64,17 +66,30 @@
  *   SCHED_TUNABLESCALING_LOG - scaled logarithmically, *1+ilog(ncpus)
  *   SCHED_TUNABLESCALING_LINEAR - scaled linear, *ncpus
  *
- * (default SCHED_TUNABLESCALING_LOG = *(1+ilog(ncpus))
+ * BORE : default SCHED_TUNABLESCALING_NONE = *1 constant     
+ * EEVDF: default SCHED_TUNABLESCALING_LOG  = *(1+ilog(ncpus))
  */
-unsigned int sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
+#ifdef CONFIG_SCHED_BORE
+ unsigned int sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
+#else // !CONFIG_SCHED_BORE
+ unsigned int sysctl_sched_tunable_scaling = SCHED_TUNABLESCALING_LOG;
+#endif // CONFIG_SCHED_BORE
 
 /*
  * Minimal preemption granularity for CPU-bound tasks:
  *
- * (default: 0.75 msec * (1 + ilog(ncpus)), units: nanoseconds)
+ * BORE : base_slice = minimum multiple of nsecs_per_tick >= min_base_slice
+ * (default min_base_slice = 2000000 constant, units: nanoseconds)         
+ * EEVDF: default 0.75 msec * (1 + ilog(ncpus)), units: nanoseconds        
  */
-unsigned int sysctl_sched_base_slice			= 750000ULL;
-static unsigned int normalized_sysctl_sched_base_slice	= 750000ULL;
+#ifdef CONFIG_SCHED_BORE
+static const unsigned int nsecs_per_tick       = 1000000000ULL / HZ;
+unsigned int sysctl_sched_min_base_slice       = CONFIG_MIN_BASE_SLICE_NS;
+__read_mostly uint sysctl_sched_base_slice     = nsecs_per_tick;
+#else // !CONFIG_SCHED_BORE
+ unsigned int sysctl_sched_base_slice			= 750000ULL;
+ static unsigned int normalized_sysctl_sched_base_slice	= 750000ULL;
+#endif // CONFIG_SCHED_BORE
 
 const_debug unsigned int sysctl_sched_migration_cost	= 500000UL;
 
@@ -188,6 +203,13 @@ static inline void update_load_set(struct load_weight *lw, unsigned long w)
  *
  * This idea comes from the SD scheduler of Con Kolivas:
  */
+#ifdef CONFIG_SCHED_BORE
+static void update_sysctl(void) {
+	sysctl_sched_base_slice = nsecs_per_tick *
+		max(1UL, DIV_ROUND_UP(sysctl_sched_min_base_slice, nsecs_per_tick));
+}
+void sched_update_min_base_slice(void) { update_sysctl(); }
+#else // !CONFIG_SCHED_BORE
 static unsigned int get_update_sysctl_factor(void)
 {
 	unsigned int cpus = min_t(unsigned int, num_online_cpus(), 8);
@@ -218,6 +240,7 @@ static void update_sysctl(void)
 	SET_SYSCTL(sched_base_slice);
 #undef SET_SYSCTL
 }
+#endif // CONFIG_SCHED_BORE
 
 void __init sched_init_granularity(void)
 {
@@ -697,6 +720,9 @@ static void update_entity_lag(struct cfs_rq *cfs_rq, struct sched_entity *se)
 
 	vlag = avg_vruntime(cfs_rq) - se->vruntime;
 	limit = calc_delta_fair(max_t(u64, 2*se->slice, TICK_NSEC), se);
+#ifdef CONFIG_SCHED_BORE
+	limit >>= !!sched_bore;
+#endif // CONFIG_SCHED_BORE
 
 	se->vlag = clamp(vlag, -limit, limit);
 }
@@ -921,6 +947,10 @@ static struct sched_entity *pick_eevdf(struct cfs_rq *cfs_rq)
 	 * until it gets a new slice. See the HACK in set_next_entity().
 	 */
 	if (sched_feat(RUN_TO_PARITY) && curr && curr->vlag == curr->deadline)
+#ifdef CONFIG_SCHED_BORE
+		if (!(likely(sched_bore) && likely(sched_burst_parity_threshold) &&
+			sched_burst_parity_threshold < cfs_rq->nr_running))
+#endif // CONFIG_SCHED_BORE
 		return curr;
 
 	/* Pick the leftmost entity if it's eligible */
@@ -979,6 +1009,7 @@ struct sched_entity *__pick_last_entity(struct cfs_rq *cfs_rq)
  * Scheduling class statistics methods:
  */
 #ifdef CONFIG_SMP
+#if !defined(CONFIG_SCHED_BORE)
 int sched_update_scaling(void)
 {
 	unsigned int factor = get_update_sysctl_factor();
@@ -990,6 +1021,7 @@ int sched_update_scaling(void)
 
 	return 0;
 }
+#endif // CONFIG_SCHED_BORE
 #endif
 #endif
 
@@ -1220,6 +1252,10 @@ static void update_curr(struct cfs_rq *cfs_rq)
 	if (unlikely(delta_exec <= 0))
 		return;
 
+#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);
 	resched = update_deadline(cfs_rq, curr);
 	update_min_vruntime(cfs_rq);
@@ -3771,7 +3807,7 @@ dequeue_load_avg(struct cfs_rq *cfs_rq, struct sched_entity *se) { }
 
 static void place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags);
 
-static void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
+void reweight_entity(struct cfs_rq *cfs_rq, struct sched_entity *se,
 			    unsigned long weight)
 {
 	bool curr = cfs_rq->curr == se;
@@ -5259,7 +5295,11 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
 		se->rel_deadline = 0;
 		return;
 	}
-
+#ifdef CONFIG_SCHED_BORE
+	else if (likely(sched_bore))
+		vslice >>= !!(flags & sched_deadline_boost_mask);
+	else
+#endif // CONFIG_SCHED_BORE
 	/*
 	 * When joining the competition; the existing tasks will be,
 	 * on average, halfway through their slice, as such start tasks
@@ -7135,6 +7175,15 @@ static bool dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 		util_est_dequeue(&rq->cfs, p);
 
 	util_est_update(&rq->cfs, p, flags & DEQUEUE_SLEEP);
+#ifdef CONFIG_SCHED_BORE
+	struct cfs_rq *cfs_rq = &rq->cfs;
+	struct sched_entity *se = &p->se;
+	if (flags & DEQUEUE_SLEEP && entity_is_task(se)) {
+		if (cfs_rq->curr == se)
+			update_curr(cfs_rq);
+		restart_burst(se);
+	}
+#endif // CONFIG_SCHED_BORE
 	if (dequeue_entities(rq, &p->se, flags) < 0)
 		return false;
 
@@ -8948,16 +8997,25 @@ static void yield_task_fair(struct rq *rq)
 	/*
 	 * Are we the only task in the tree?
 	 */
+#if !defined(CONFIG_SCHED_BORE)
 	if (unlikely(rq->nr_running == 1))
 		return;
 
 	clear_buddies(cfs_rq, se);
+#endif // CONFIG_SCHED_BORE
 
 	update_rq_clock(rq);
 	/*
 	 * Update run-time statistics of the 'current'.
 	 */
 	update_curr(cfs_rq);
+#ifdef CONFIG_SCHED_BORE
+	restart_burst_rescale_deadline(se);
+	if (unlikely(rq->nr_running == 1))
+		return;
+
+	clear_buddies(cfs_rq, se);
+#endif // CONFIG_SCHED_BORE
 	/*
 	 * Tell update_rq_clock() that we've just updated,
 	 * so we don't do microscopic update in schedule()
@@ -13009,6 +13067,9 @@ static void task_tick_fair(struct rq *rq, struct task_struct *curr, int queued)
 static void task_fork_fair(struct task_struct *p)
 {
 	set_task_max_allowed_capacity(p);
+#ifdef CONFIG_SCHED_BORE
+	update_burst_score(&p->se);
+#endif // CONFIG_SCHED_BORE
 }
 
 /*
@@ -13119,6 +13180,10 @@ static void attach_task_cfs_rq(struct task_struct *p)
 
 static void switched_from_fair(struct rq *rq, struct task_struct *p)
 {
+	p->se.rel_deadline = 0;
+#ifdef CONFIG_SCHED_BORE
+	reset_task_bore(p);
+#endif // CONFIG_SCHED_BORE
 	detach_task_cfs_rq(p);
 }
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index c5d67a43f..e14855d24 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2092,7 +2092,11 @@ static inline void update_sched_domain_debugfs(void) { }
 static inline void dirty_sched_domain_sysctl(int cpu) { }
 #endif
 
+#ifdef CONFIG_SCHED_BORE
+extern void sched_update_min_base_slice(void);
+#else // !CONFIG_SCHED_BORE
 extern int sched_update_scaling(void);
+#endif // CONFIG_SCHED_BORE
 
 static inline const struct cpumask *task_user_cpus(struct task_struct *p)
 {
@@ -2829,7 +2833,12 @@ extern void wakeup_preempt(struct rq *rq, struct task_struct *p, int flags);
 extern const_debug unsigned int sysctl_sched_nr_migrate;
 extern const_debug unsigned int sysctl_sched_migration_cost;
 
+#ifdef CONFIG_SCHED_BORE
+extern unsigned int sysctl_sched_min_base_slice;
+extern __read_mostly uint sysctl_sched_base_slice;
+#else // !CONFIG_SCHED_BORE
 extern unsigned int sysctl_sched_base_slice;
+#endif // CONFIG_SCHED_BORE
 
 #ifdef CONFIG_SCHED_DEBUG
 extern int sysctl_resched_latency_warn_ms;
-- 
2.48.1