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Commit e9f5b375 authored by Lingutla Chandrasekhar's avatar Lingutla Chandrasekhar
Browse files

sched: core_ctl: Improve the scheduler 



This change is for general scheduler improvements.

Change-Id: If6802317f94e31230efd34773bb0d75ba62a5968
Signed-off-by: default avatarLingutla Chandrasekhar <clingutla@codeaurora.org>
parent 090c2c57

kernel/sched/core_ctl.c

+8 −1
Original line number Diff line number Diff line
@@ -769,6 +769,13 @@ static bool adjustment_possible(const struct cluster_data *cluster, 
						cluster->nr_isolated_cpus));

}



static bool need_all_cpus(const struct cluster_data *cluster)

{



	return (is_min_capacity_cpu(cluster->first_cpu) &&

		sched_ravg_window < DEFAULT_SCHED_RAVG_WINDOW);

}



static bool eval_need(struct cluster_data *cluster)

{

	unsigned long flags;
@@ -784,7 +791,7 @@ static bool eval_need(struct cluster_data *cluster) 


	spin_lock_irqsave(&state_lock, flags);



	if (cluster->boost || !cluster->enable) {

	if (cluster->boost || !cluster->enable || need_all_cpus(cluster)) {

		need_cpus = cluster->max_cpus;

	} else {

		cluster->active_cpus = get_active_cpu_count(cluster);

kernel/sched/walt.c

+5 −21
Original line number Diff line number Diff line
@@ -94,22 +94,6 @@ static void release_rq_locks_irqrestore(const cpumask_t *cpus, 
	local_irq_restore(*flags);

}



#ifdef CONFIG_HZ_300

/*

 * Tick interval becomes to 3333333 due to

 * rounding error when HZ=300.

 */

#define MIN_SCHED_RAVG_WINDOW (3333333 * 6)

#else

/* Min window size (in ns) = 20ms */

#define MIN_SCHED_RAVG_WINDOW 20000000

#endif



/* Max window size (in ns) = 1s */

#define MAX_SCHED_RAVG_WINDOW 1000000000



#define NR_WINDOWS_PER_SEC (NSEC_PER_SEC / MIN_SCHED_RAVG_WINDOW)



__read_mostly unsigned int sysctl_sched_cpu_high_irqload = TICK_NSEC;



unsigned int sysctl_sched_walt_rotate_big_tasks;
@@ -131,8 +115,8 @@ static unsigned int display_sched_ravg_window_nr_ticks = 
unsigned int sysctl_sched_dynamic_ravg_window_enable = (HZ == 250);



/* Window size (in ns) */

__read_mostly unsigned int sched_ravg_window = MIN_SCHED_RAVG_WINDOW;

__read_mostly unsigned int new_sched_ravg_window = MIN_SCHED_RAVG_WINDOW;

__read_mostly unsigned int sched_ravg_window = DEFAULT_SCHED_RAVG_WINDOW;

__read_mostly unsigned int new_sched_ravg_window = DEFAULT_SCHED_RAVG_WINDOW;



static DEFINE_SPINLOCK(sched_ravg_window_lock);

u64 sched_ravg_window_change_time;
@@ -172,11 +156,11 @@ unsigned int __read_mostly sched_disable_window_stats; 
 * The entire range of load from 0 to sched_ravg_window needs to be covered

 * in NUM_LOAD_INDICES number of buckets. Therefore the size of each bucket

 * is given by sched_ravg_window / NUM_LOAD_INDICES. Since the default value

 * of sched_ravg_window is MIN_SCHED_RAVG_WINDOW, use that to compute

 * of sched_ravg_window is DEFAULT_SCHED_RAVG_WINDOW, use that to compute

 * sched_load_granule.

 */

__read_mostly unsigned int sched_load_granule =

			MIN_SCHED_RAVG_WINDOW / NUM_LOAD_INDICES;

			DEFAULT_SCHED_RAVG_WINDOW / NUM_LOAD_INDICES;

/* Size of bitmaps maintained to track top tasks */

static const unsigned int top_tasks_bitmap_size =

		BITS_TO_LONGS(NUM_LOAD_INDICES + 1) * sizeof(unsigned long);
@@ -193,7 +177,7 @@ static int __init set_sched_ravg_window(char *str) 


	get_option(&str, &window_size);



	if (window_size < MIN_SCHED_RAVG_WINDOW ||

	if (window_size < DEFAULT_SCHED_RAVG_WINDOW ||

			window_size > MAX_SCHED_RAVG_WINDOW) {

		WARN_ON(1);

		return -EINVAL;

kernel/sched/walt.h

+15 −0
Original line number Diff line number Diff line
@@ -13,6 +13,21 @@ 


#define MAX_NR_CLUSTERS			3



#ifdef CONFIG_HZ_300

/*

 * Tick interval becomes to 3333333 due to

 * rounding error when HZ=300.

 */

#define DEFAULT_SCHED_RAVG_WINDOW (3333333 * 6)

#else

/* Default window size (in ns) = 20ms */

#define DEFAULT_SCHED_RAVG_WINDOW 20000000

#endif



/* Max window size (in ns) = 1s */

#define MAX_SCHED_RAVG_WINDOW 1000000000

#define NR_WINDOWS_PER_SEC (NSEC_PER_SEC / DEFAULT_SCHED_RAVG_WINDOW)



#define WINDOW_STATS_RECENT		0

#define WINDOW_STATS_MAX		1

#define WINDOW_STATS_MAX_RECENT_AVG	2