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sched/walt: Improve the scheduler

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This change is for general scheduler improvement.

Change-Id: Ia728ecbc780c9d172b49029ef3c87c6b3b490872
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
This commit is contained in:
Pavankumar Kondeti 2020-08-12 09:36:11 +05:30
commit 2c80b14d6a
4 changed files with 17 additions and 1 deletions
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1
include/linux/sched/sysctl.h
View file

@ -56,6 +56,7 @@ extern unsigned int __weak sysctl_sched_many_wakeup_threshold;
extern unsigned int __weak sysctl_sched_dynamic_ravg_window_enable;
extern unsigned int sysctl_sched_prefer_spread;
extern unsigned int sysctl_walt_rtg_cfs_boost_prio;
extern unsigned int sysctl_walt_low_latency_task_boost;
extern int
walt_proc_group_thresholds_handler(struct ctl_table *table, int write,

3
kernel/sched/fair.c
View file

@ -134,6 +134,7 @@ unsigned int sched_capacity_margin_down[NR_CPUS] = {
#ifdef CONFIG_SCHED_WALT
__read_mostly unsigned int sysctl_sched_prefer_spread;
unsigned int sysctl_walt_rtg_cfs_boost_prio = 99; /* disabled by default */
unsigned int sysctl_walt_low_latency_task_boost; /* disabled by default */
#endif
unsigned int sched_small_task_threshold = 102;
@ -4077,7 +4078,7 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial)
TASK_BOOST_STRICT_MAX)
vruntime -= sysctl_sched_latency;
#ifdef CONFIG_SCHED_WALT
else if (task_of(se)->wts.low_latency ||
else if (walt_low_latency_task(task_of(se)) ||
task_rtg_high_prio(task_of(se))) {
vruntime -= sysctl_sched_latency;
vruntime -= thresh;

5
kernel/sched/sched.h
View file

@ -3004,6 +3004,11 @@ static inline struct walt_related_thread_group
return rcu_dereference(p->wts.grp);
}
static inline bool walt_low_latency_task(struct task_struct *p)
{
return sysctl_walt_low_latency_task_boost && p->wts.low_latency;
}
/* Is frequency of two cpus synchronized with each other? */
static inline int same_freq_domain(int src_cpu, int dst_cpu)
{

9
kernel/sysctl.c
View file

@ -563,6 +563,15 @@ static struct ctl_table kern_table[] = {
.extra1 = &min_cfs_boost_prio,
.extra2 = &max_cfs_boost_prio,
},
{
.procname = "walt_low_latency_task_boost",
.data = &sysctl_walt_low_latency_task_boost,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#endif
#ifdef CONFIG_SCHED_DEBUG
{