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Commit f1627cb4 authored by Biao Long's avatar Biao Long Committed by Gerrit - the friendly Code Review server
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sched/fair: Improve the scheduler 



This change is for general scheduler improvements.

Change-Id: I917955ef029f30db6c185a41f717a89dd179cc49
Signed-off-by: default avatarBiao Long <blong@codeaurora.org>
parent 122f4cad

include/linux/sched/sysctl.h

+1 −0
Original line number Diff line number Diff line
@@ -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];

kernel/sched/fair.c

+2 −0
Original line number Diff line number Diff line
@@ -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));

kernel/sysctl.c

+9 −0
Original line number Diff line number Diff line
@@ -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",