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Commit e2c44d5b authored by Sai Harshini Nimmala's avatar Sai Harshini Nimmala
Browse files

sched/walt: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: I8459bcf7b412a5f301566054c28c910567548485
Signed-off-by: default avatarSai Harshini Nimmala <snimmala@codeaurora.org>
parent dd8171dd

include/linux/sched/sysctl.h

+6 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ extern unsigned int sysctl_sched_coloc_busy_hyst_enable_cpus; 
extern unsigned int sysctl_sched_coloc_busy_hyst;

extern unsigned int sysctl_sched_coloc_busy_hyst_max_ms;

extern unsigned int sysctl_sched_window_stats_policy;

extern unsigned int sysctl_sched_ravg_window_nr_ticks;



extern int

walt_proc_group_thresholds_handler(struct ctl_table *table, int write,
@@ -63,6 +64,11 @@ walt_proc_user_hint_handler(struct ctl_table *table, int write, 
			 void __user *buffer, size_t *lenp,

			 loff_t *ppos);



extern int

sched_ravg_window_handler(struct ctl_table *table, int write,

			 void __user *buffer, size_t *lenp,

			 loff_t *ppos);



#endif



#if defined(CONFIG_PREEMPT_TRACER) || defined(CONFIG_DEBUG_PREEMPT)

include/linux/sysctl.h

+4 −0
Original line number Diff line number Diff line
@@ -67,6 +67,10 @@ extern int proc_douintvec_capacity(struct ctl_table *table, int write, 
				   void __user *buffer, size_t *lenp,

				   loff_t *ppos);



extern int proc_douintvec_ravg_window(struct ctl_table *table, int write,

				      void __user *buffer, size_t *lenp,

				      loff_t *ppos);



/*

 * Register a set of sysctl names by calling register_sysctl_table

 * with an initialised array of struct ctl_table's.  An entry with

kernel/sched/walt.c

+34 −0
Original line number Diff line number Diff line
@@ -108,6 +108,8 @@ static void release_rq_locks_irqrestore(const cpumask_t *cpus, 
/* 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 = (10 * NSEC_PER_MSEC);



unsigned int sysctl_sched_walt_rotate_big_tasks;
@@ -121,6 +123,9 @@ static __read_mostly unsigned int sched_io_is_busy = 1; 
__read_mostly unsigned int sysctl_sched_window_stats_policy =

	WINDOW_STATS_MAX_RECENT_AVG;



__read_mostly unsigned int sysctl_sched_ravg_window_nr_ticks =

	(HZ / NR_WINDOWS_PER_SEC);



/* 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;
@@ -3552,3 +3557,32 @@ int walt_proc_user_hint_handler(struct ctl_table *table, 
	mutex_unlock(&mutex);

	return ret;

}



static inline void sched_window_nr_ticks_change(int new_nr_ticks)

{

	new_sched_ravg_window = new_nr_ticks * (NSEC_PER_SEC / HZ);

}



int sched_ravg_window_handler(struct ctl_table *table,

				int write, void __user *buffer, size_t *lenp,

				loff_t *ppos)

{

	int ret;

	static DEFINE_MUTEX(mutex);

	unsigned int prev_value;



	mutex_lock(&mutex);



	prev_value = sysctl_sched_ravg_window_nr_ticks;

	ret = proc_douintvec_ravg_window(table, write, buffer, lenp, ppos);

	if (ret || !write ||

			(prev_value == sysctl_sched_ravg_window_nr_ticks) ||

			(sysctl_sched_ravg_window_nr_ticks == 0))

		goto unlock;



	sched_window_nr_ticks_change(sysctl_sched_ravg_window_nr_ticks);



unlock:

	mutex_unlock(&mutex);

	return ret;

}

kernel/sysctl.c

+36 −0
Original line number Diff line number Diff line
@@ -511,6 +511,13 @@ static struct ctl_table kern_table[] = { 
		.extra1		= &zero,

		.extra2		= &one_hundred_thousand,

	},

	{

		.procname	= "sched_ravg_window_nr_ticks",

		.data		= &sysctl_sched_ravg_window_nr_ticks,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler	= sched_ravg_window_handler,

	},

#endif

#ifdef CONFIG_SMP

	{
@@ -3544,6 +3551,29 @@ int proc_douintvec_capacity(struct ctl_table *table, int write, 
				do_proc_douintvec_capacity_conv, NULL);

}



static int do_proc_douintvec_rwin(bool *negp, unsigned long *lvalp,

				  int *valp, int write, void *data)

{

	if (write) {

		if (*lvalp == 0 || *lvalp == 2 || *lvalp == 5)

			*valp = *lvalp;

		else

			return -EINVAL;

	} else {

		*negp = false;

		*lvalp = *valp;

	}



	return 0;

}



int proc_douintvec_ravg_window(struct ctl_table *table, int write,

			       void __user *buffer, size_t *lenp, loff_t *ppos)

{

	return do_proc_dointvec(table, write, buffer, lenp, ppos,

				do_proc_douintvec_rwin, NULL);

}



#else /* CONFIG_PROC_SYSCTL */



int proc_dostring(struct ctl_table *table, int write,
@@ -3613,6 +3643,12 @@ int proc_douintvec_capacity(struct ctl_table *table, int write, 
	return -ENOSYS;

}



int proc_douintvec_ravg_window(struct ctl_table *table, int write,

			       void __user *buffer, size_t *lenp, loff_t *ppos)

{

	return -ENOSYS;

}



#endif /* CONFIG_PROC_SYSCTL */



/*