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SUNLIGHT: SCHED: BORE - CPU scheduler v6.12
Description: - SCHED: BORE - CPU scheduler v6.12 BORE(Burst-Oriented Response Enhancer) 5.7.13 Bug: N/A Change-Id: I3b83ed6e543cf93ffddee26c5b133d591e5dd30c Signed-off-by: Ionut Nechita <ionut_n2001@yahoo.com>
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11 files changed

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11 files changed

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‎include/linux/sched.h

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@@ -540,6 +540,14 @@ struct sched_statistics {
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#endif /* CONFIG_SCHEDSTATS */
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} ____cacheline_aligned;
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#ifdef CONFIG_SCHED_BORE
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struct sched_burst_cache {
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u8 score;
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u32 count;
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u64 timestamp;
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};
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#endif // CONFIG_SCHED_BORE
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struct sched_entity {
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/* For load-balancing: */
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struct load_weight load;
@@ -559,6 +567,15 @@ struct sched_entity {
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u64 sum_exec_runtime;
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u64 prev_sum_exec_runtime;
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u64 vruntime;
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#ifdef CONFIG_SCHED_BORE
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u64 burst_time;
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u8 prev_burst_penalty;
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u8 curr_burst_penalty;
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u8 burst_penalty;
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u8 burst_score;
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struct sched_burst_cache child_burst;
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struct sched_burst_cache group_burst;
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#endif // CONFIG_SCHED_BORE
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s64 vlag;
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u64 slice;
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‎include/linux/sched/bore.h

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@@ -0,0 +1,40 @@
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#include <linux/sched.h>
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#include <linux/sched/cputime.h>
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#ifndef _LINUX_SCHED_BORE_H
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#define _LINUX_SCHED_BORE_H
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#define SCHED_BORE_VERSION "5.7.13"
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#ifdef CONFIG_SCHED_BORE
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extern u8 __read_mostly sched_bore;
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extern u8 __read_mostly sched_burst_exclude_kthreads;
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extern u8 __read_mostly sched_burst_smoothness_long;
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extern u8 __read_mostly sched_burst_smoothness_short;
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extern u8 __read_mostly sched_burst_fork_atavistic;
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extern u8 __read_mostly sched_burst_parity_threshold;
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extern u8 __read_mostly sched_burst_penalty_offset;
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extern uint __read_mostly sched_burst_penalty_scale;
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extern uint __read_mostly sched_burst_cache_stop_count;
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extern uint __read_mostly sched_burst_cache_lifetime;
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extern uint __read_mostly sched_deadline_boost_mask;
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extern void update_burst_score(struct sched_entity *se);
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extern void update_burst_penalty(struct sched_entity *se);
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extern void restart_burst(struct sched_entity *se);
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extern void restart_burst_rescale_deadline(struct sched_entity *se);
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extern int sched_bore_update_handler(const struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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extern void sched_clone_bore(
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struct task_struct *p, struct task_struct *parent, u64 clone_flags);
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extern void init_task_bore(struct task_struct *p);
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extern void sched_bore_init(void);
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extern void reweight_entity(
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struct cfs_rq *cfs_rq, struct sched_entity *se, unsigned long weight);
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#endif // CONFIG_SCHED_BORE
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#endif // _LINUX_SCHED_BORE_H

‎init/Kconfig

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@@ -1341,6 +1341,23 @@ config CHECKPOINT_RESTORE
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If unsure, say N here.
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config SCHED_BORE
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bool "Burst-Oriented Response Enhancer"
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default y
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help
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In Desktop and Mobile computing, one might prefer interactive
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tasks to keep responsive no matter what they run in the background.
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Enabling this kernel feature modifies the scheduler to discriminate
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tasks by their burst time (runtime since it last went sleeping or
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yielding state) and prioritize those that run less bursty.
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Such tasks usually include window compositor, widgets backend,
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terminal emulator, video playback, games and so on.
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With a little impact to scheduling fairness, it may improve
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responsiveness especially under heavy background workload.
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If unsure, say Y here.
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config SCHED_AUTOGROUP
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bool "Automatic process group scheduling"
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select CGROUPS

‎kernel/Kconfig.hz

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@@ -63,5 +63,22 @@ config HZ
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default 858 if HZ_858
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default 1000 if HZ_1000
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config MIN_BASE_SLICE_NS
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int "Default value for min_base_slice_ns"
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default 2000000
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help
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The BORE Scheduler automatically calculates the optimal base
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slice for the configured HZ using the following equation:
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base_slice_ns =
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1000000000/HZ * DIV_ROUNDUP(min_base_slice_ns, 1000000000/HZ)
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This option sets the default lower bound limit of the base slice
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to prevent the loss of task throughput due to overscheduling.
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Setting this value too high can cause the system to boot with
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an unnecessarily large base slice, resulting in high scheduling
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latency and poor system responsiveness.
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config SCHED_HRTICK
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def_bool HIGH_RES_TIMERS

‎kernel/fork.c

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@@ -114,6 +114,8 @@
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <linux/sched/bore.h>
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#include <trace/events/sched.h>
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#define CREATE_TRACE_POINTS
@@ -2378,6 +2380,9 @@ __latent_entropy struct task_struct *copy_process(
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retval = sched_fork(clone_flags, p);
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if (retval)
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goto bad_fork_cleanup_policy;
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#ifdef CONFIG_SCHED_BORE
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sched_clone_bore(p, current, clone_flags);
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#endif // CONFIG_SCHED_BORE
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retval = perf_event_init_task(p, clone_flags);
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if (retval)

‎kernel/sched/Makefile

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@@ -33,3 +33,4 @@ obj-y += fair.o
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obj-y += build_policy.o
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obj-y += build_utility.o
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obj-$(CONFIG_ANDROID_VENDOR_HOOKS) += vendor_hooks.o
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obj-y += bore.o

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