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Commit 67e9f6f8 authored by Tengfei Fan's avatar Tengfei Fan Committed by Pavankumar Kondeti
Browse files

sched/walt: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: If03bf5f104740adf09d854837ae9b141dc97cbc6
Signed-off-by: default avatarTengfei Fan <tengfeif@codeaurora.org>
[pkondeti@codeaurora: Added tunable based on priority]
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent e3e20132

include/linux/sched/sysctl.h

+1 −0
Original line number Diff line number Diff line
@@ -57,6 +57,7 @@ extern unsigned int sysctl_sched_window_stats_policy; 
extern unsigned int sysctl_sched_ravg_window_nr_ticks;

extern unsigned int sysctl_sched_dynamic_ravg_window_enable;

extern unsigned int sysctl_sched_prefer_spread;

extern unsigned int sysctl_walt_rtg_cfs_boost_prio;



extern int

walt_proc_group_thresholds_handler(struct ctl_table *table, int write,

kernel/sched/fair.c

+6 −0
Original line number Diff line number Diff line
@@ -176,6 +176,7 @@ unsigned int sysctl_sched_min_task_util_for_boost = 51; 
/* 0.68ms default for 20ms window size scaled to 1024 */

unsigned int sysctl_sched_min_task_util_for_colocation = 35;

__read_mostly unsigned int sysctl_sched_prefer_spread;

unsigned int sysctl_walt_rtg_cfs_boost_prio = 99; /* disabled by default */

#endif

unsigned int sched_small_task_threshold = 102;
@@ -4136,6 +4137,11 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial) 
				se->vruntime = min_vruntime(vruntime,

							se->vruntime);

				return;

			} else if (task_rtg_high_prio(task_of(se))) {

				vruntime -= thresh;

				se->vruntime = min_vruntime(vruntime,

							se->vruntime);

				return;

			}

#endif

		}

kernel/sched/sched.h

+11 −0
Original line number Diff line number Diff line
@@ -2896,6 +2896,12 @@ struct related_thread_group *task_related_thread_group(struct task_struct *p) 
	return rcu_dereference(p->grp);

}



static inline bool task_rtg_high_prio(struct task_struct *p)

{

	return task_in_related_thread_group(p) &&

		(p->prio <= sysctl_walt_rtg_cfs_boost_prio);

}



/* Is frequency of two cpus synchronized with each other? */

static inline int same_freq_domain(int src_cpu, int dst_cpu)

{
@@ -3130,6 +3136,11 @@ struct related_thread_group *task_related_thread_group(struct task_struct *p) 
	return NULL;

}



static inline bool task_rtg_high_prio(struct task_struct *p)

{

	return false;

}



static inline u32 task_load(struct task_struct *p) { return 0; }

static inline u32 task_pl(struct task_struct *p) { return 0; }

kernel/sysctl.c

+18 −0
Original line number Diff line number Diff line
@@ -148,6 +148,15 @@ static int __maybe_unused two_hundred_million = 200000000; 
const int sched_user_hint_max = 1000;

static unsigned int ns_per_sec = NSEC_PER_SEC;

static unsigned int one_hundred_thousand = 100000;

/*

 * CFS task prio range is [100 ... 139]

 * 120 is the default prio.

 * RTG boost range is [100 ... 119] because giving

 * boost for [120 .. 139] does not make sense.

 * 99 means disabled and it is the default value.

 */

static unsigned int min_cfs_boost_prio = 99;

static unsigned int max_cfs_boost_prio = 119;

#endif

/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */

static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
@@ -561,6 +570,15 @@ static struct ctl_table kern_table[] = { 
		.extra1		= &zero,

		.extra2		= &two,

	},

	{

		.procname	= "walt_rtg_cfs_boost_prio",

		.data		= &sysctl_walt_rtg_cfs_boost_prio,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler   = proc_dointvec_minmax,

		.extra1		= &min_cfs_boost_prio,

		.extra2		= &max_cfs_boost_prio,

	},

#endif

#ifdef CONFIG_SCHED_DEBUG

	{