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sched/fair: Improve the scheduler

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This change is for general scheduler improvements.

Change-Id: I917955ef029f30db6c185a41f717a89dd179cc49
Signed-off-by: Biao Long <blong@codeaurora.org>
This commit is contained in:
Biao Long 2020-09-02 16:52:05 +08:00 • committed by Gerrit - the friendly Code Review server
commit f1627cb4d6
3 changed files with 12 additions and 0 deletions
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1
include/linux/sched/sysctl.h
View file

@ -29,6 +29,7 @@ extern unsigned int sysctl_sched_latency;
extern unsigned int sysctl_sched_min_granularity;
extern unsigned int sysctl_sched_wakeup_granularity;
extern unsigned int sysctl_sched_child_runs_first;
extern unsigned int sysctl_sched_force_lb_enable;
#ifdef CONFIG_SCHED_WALT
extern unsigned int __weak sysctl_sched_capacity_margin_up[MAX_MARGIN_LEVELS];
extern unsigned int __weak sysctl_sched_capacity_margin_down[MAX_MARGIN_LEVELS];

2
kernel/sched/fair.c
View file

@ -138,6 +138,7 @@ 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;
__read_mostly unsigned int sysctl_sched_force_lb_enable = 1;
static inline void update_load_add(struct load_weight *lw, unsigned long inc)
{
@ -11358,6 +11359,7 @@ int newidle_balance(struct rq *this_rq, struct rq_flags *rf)
bool prefer_spread = prefer_spread_on_idle(this_cpu, true);
bool force_lb = (!is_min_capacity_cpu(this_cpu) &&
silver_has_big_tasks() &&
sysctl_sched_force_lb_enable &&
(atomic_read(&this_rq->nr_iowait) == 0));

9
kernel/sysctl.c
View file

@ -573,6 +573,15 @@ static struct ctl_table kern_table[] = {
.extra2 = SYSCTL_ONE,
},
#endif
{
.procname = "sched_force_lb_enable",
.data = &sysctl_sched_force_lb_enable,
.maxlen = sizeof(unsigned int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = SYSCTL_ZERO,
.extra2 = SYSCTL_ONE,
},
#ifdef CONFIG_SCHED_DEBUG
{
.procname = "sched_min_granularity_ns",