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linux-pikaos-6.12.5/patches/0002-bore-cachy.patch

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From d5457aadc3cf13e70807fcd568468bf5ee6ce310 Mon Sep 17 00:00:00 2001
From: Eric Naim <dnaim@cachyos.org>
Date: Thu, 12 Dec 2024 16:30:54 +0800
Subject: [PATCH] bore-cachy
Signed-off-by: Eric Naim <dnaim@cachyos.org>
---
include/linux/sched.h | 17 ++
include/linux/sched/bore.h | 40 ++++
init/Kconfig | 17 ++
kernel/Kconfig.hz | 17 ++
kernel/fork.c | 5 +
kernel/sched/Makefile | 1 +
kernel/sched/bore.c | 423 +++++++++++++++++++++++++++++++++++++
kernel/sched/core.c | 6 +
kernel/sched/debug.c | 61 +++++-
kernel/sched/fair.c | 88 ++++++--
kernel/sched/sched.h | 9 +
11 files changed, 666 insertions(+), 18 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 bb343136ddd0..c86185f87e7b 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -538,6 +538,14 @@ struct sched_statistics {
#endif /* CONFIG_SCHEDSTATS */
} ____cacheline_aligned;
+#ifdef CONFIG_SCHED_BORE
+struct sched_burst_cache {
+ u8 score;
+ u32 count;
+ u64 timestamp;
+};
+#endif // CONFIG_SCHED_BORE
+
struct sched_entity {
/* For load-balancing: */
struct load_weight load;
@@ -557,6 +565,15 @@ 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 000000000000..4f3d3cbefe3c
--- /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 "5.7.13"
+
+#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);
+
+extern void init_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 857869dbc22c..9bd4551a7c3a 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1361,6 +1361,23 @@ 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 0f78364efd4f..83a6b919ab29 100644
--- a/kernel/Kconfig.hz
+++ b/kernel/Kconfig.hz
@@ -79,5 +79,22 @@ config HZ
default 750 if HZ_750
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 e97e527cec69..d40105f4b177 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -117,6 +117,8 @@
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
+#include <linux/sched/bore.h>
+
#include <trace/events/sched.h>
#define CREATE_TRACE_POINTS
@@ -2372,6 +2374,9 @@ __latent_entropy struct task_struct *copy_process(
retval = sched_fork(clone_flags, p);
if (retval)
goto bad_fork_cleanup_policy;
+#ifdef CONFIG_SCHED_BORE
+ sched_clone_bore(p, current, clone_flags);
+#endif // CONFIG_SCHED_BORE
retval = perf_event_init_task(p, clone_flags);
if (retval)
diff --git a/kernel/sched/Makefile b/kernel/sched/Makefile
index 976092b7bd45..293aad675444 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 000000000000..da1edca15414
--- /dev/null
+++ b/kernel/sched/bore.c
@@ -0,0 +1,423 @@
+/*
+ * 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_lock_irqsave(rq, &rf);
+ reweight_task_by_prio(task, effective_prio(task));
+ rq_unlock_irqrestore(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_children_max2(struct task_struct *p) {
+ u32 cnt = 0;
+ struct task_struct *child;
+ for_each_child(p, child) {if (2 <= ++cnt) break;}
+ return cnt;
+}
+
+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;
+
+ if (clone_flags & CLONE_PARENT)
+ parent = parent->real_parent;
+
+ if (burst_cache_expired(&parent->se.child_burst, now))
+ update_child_burst_direct(parent, now);
+
+ return parent->se.child_burst.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;
+
+ for_each_child(p, child) {
+ dec = child;
+ while ((dcnt = count_children_max2(dec)) == 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;
+ }
+ if (!burst_cache_expired(&dec->se.child_burst, now)) {
+ cnt += dec->se.child_burst.count;
+ sum += (u32)dec->se.child_burst.score * dec->se.child_burst.count;
+ if (sched_burst_cache_stop_count <= cnt) break;
+ continue;
+ }
+ update_child_burst_topological(dec, now, depth - 1, &cnt, &sum);
+ }
+
+ 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;
+ 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_children_max2(anc) <= base_child_cnt;) {
+ anc = next;
+ base_child_cnt = 1;
+ }
+
+ if (burst_cache_expired(&anc->se.child_burst, now))
+ update_child_burst_topological(
+ anc, now, sched_burst_fork_atavistic - 1, &cnt, &sum);
+
+ return anc->se.child_burst.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);
+ if (burst_cache_expired(&parent->se.group_burst, now))
+ update_tg_burst(parent, now);
+
+ return parent->se.group_burst.score;
+}
+
+void sched_clone_bore(
+ struct task_struct *p, struct task_struct *parent, u64 clone_flags) {
+ u64 now;
+ u8 penalty;
+
+ if (!task_is_bore_eligible(p)) return;
+
+ if (clone_flags & CLONE_THREAD) {
+ rcu_read_lock();
+ now = jiffies_to_nsecs(jiffies);
+ penalty = inherit_burst_tg(parent, now);
+ rcu_read_unlock();
+ } else {
+ read_lock(&tasklist_lock);
+ now = jiffies_to_nsecs(jiffies);
+ penalty = likely(sched_burst_fork_atavistic) ?
+ inherit_burst_topological(parent, now, clone_flags):
+ inherit_burst_direct(parent, now, clone_flags);
+ read_unlock(&tasklist_lock);
+ }
+
+ struct sched_entity *se = &p->se;
+ 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 init_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);
+ init_task_bore(&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 76b27b2a9c56..7371dff0c158 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);
@@ -8377,6 +8379,10 @@ 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 f4035c7a0fa1..0edb3a216f5d 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
@@ -504,13 +550,20 @@ 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);
@@ -755,6 +808,9 @@ 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
@@ -1243,6 +1299,9 @@ 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 54e7c4c3e2c5..94c54154a175 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
*
@@ -64,28 +66,32 @@
* 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))
*/
+#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
*/
-#ifdef CONFIG_CACHY
-unsigned int sysctl_sched_base_slice = 350000ULL;
-static unsigned int normalized_sysctl_sched_base_slice = 350000ULL;
-#else
+#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
+#endif // CONFIG_SCHED_BORE
-#ifdef CONFIG_CACHY
-const_debug unsigned int sysctl_sched_migration_cost = 300000UL;
-#else
const_debug unsigned int sysctl_sched_migration_cost = 500000UL;
-#endif
static int __init setup_sched_thermal_decay_shift(char *str)
{
@@ -130,12 +136,8 @@ int __weak arch_asym_cpu_priority(int cpu)
*
* (default: 5 msec, units: microseconds)
*/
-#ifdef CONFIG_CACHY
-static unsigned int sysctl_sched_cfs_bandwidth_slice = 3000UL;
-#else
static unsigned int sysctl_sched_cfs_bandwidth_slice = 5000UL;
#endif
-#endif
#ifdef CONFIG_NUMA_BALANCING
/* Restrict the NUMA promotion throughput (MB/s) for each target node. */
@@ -201,6 +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);
@@ -231,6 +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)
{
@@ -708,6 +718,9 @@ static s64 entity_lag(u64 avruntime, struct sched_entity *se)
vlag = avruntime - 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
return clamp(vlag, -limit, limit);
}
@@ -939,6 +952,10 @@ 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 */
@@ -997,6 +1014,7 @@ 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();
@@ -1008,6 +1026,7 @@ int sched_update_scaling(void)
return 0;
}
+#endif // CONFIG_SCHED_BORE
#endif
#endif
@@ -1240,6 +1259,10 @@ 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);
@@ -3884,7 +3907,7 @@ static void reweight_eevdf(struct sched_entity *se, u64 avruntime,
se->deadline = avruntime + vslice;
}
-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;
@@ -5293,6 +5316,9 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags)
*
* EEVDF: placement strategy #1 / #2
*/
+#ifdef CONFIG_SCHED_BORE
+ if (se->vlag)
+#endif // CONFIG_SCHED_BORE
if (sched_feat(PLACE_LAG) && cfs_rq->nr_running) {
struct sched_entity *curr = cfs_rq->curr;
unsigned long load;
@@ -5368,7 +5394,11 @@ 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
@@ -7110,6 +7140,14 @@ static int dequeue_entities(struct rq *rq, struct sched_entity *se, int flags)
p = task_of(se);
h_nr_running = 1;
idle_h_nr_running = task_has_idle_policy(p);
+#ifdef CONFIG_SCHED_BORE
+ if (task_sleep) {
+ cfs_rq = cfs_rq_of(se);
+ if (cfs_rq->curr == se)
+ update_curr(cfs_rq);
+ restart_burst(se);
+ }
+#endif // CONFIG_SCHED_BORE
} else {
cfs_rq = group_cfs_rq(se);
slice = cfs_rq_min_slice(cfs_rq);
@@ -9025,16 +9063,25 @@ 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()
@@ -13086,6 +13133,9 @@ 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
}
/*
@@ -13196,6 +13246,10 @@ 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
+ init_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 c5d6012794de..ce3804c6fa5c 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -2075,7 +2075,11 @@ 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)
{
@@ -2825,7 +2829,12 @@ 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;
--
2.47.1
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