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Commit d3f96d21 authored by Pavankumar Kondeti's avatar Pavankumar Kondeti
Browse files

sched: Improve the scheduler 



This change is for general scheduler improvement.

Change-Id: If1ee58a8ed59e4a9ee25dfa6fa2a1c1654e00e6d
Signed-off-by: default avatarPavankumar Kondeti <pkondeti@codeaurora.org>
parent c8928333

include/linux/sched/sysctl.h

+1 −0
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ extern unsigned int sysctl_sched_cpu_high_irqload; 
extern unsigned int sysctl_sched_boost;

extern unsigned int sysctl_sched_group_upmigrate_pct;

extern unsigned int sysctl_sched_group_downmigrate_pct;

extern unsigned int sysctl_sched_conservative_pl;

extern unsigned int sysctl_sched_many_wakeup_threshold;

extern unsigned int sysctl_sched_walt_rotate_big_tasks;

extern unsigned int sysctl_sched_min_task_util_for_boost;

kernel/sched/cpufreq_schedutil.c

+15 −2
Original line number Diff line number Diff line
@@ -161,6 +161,15 @@ static inline bool use_pelt(void) 
#endif

}



static inline bool conservative_pl(void)

{

#ifdef CONFIG_SCHED_WALT

	return sysctl_sched_conservative_pl;

#else

	return false;

#endif

}



static unsigned long freq_to_util(struct sugov_policy *sg_policy,

				  unsigned int freq)

{
@@ -379,6 +388,7 @@ static void sugov_walt_adjust(struct sugov_cpu *sg_cpu, unsigned long *util, 
	unsigned long nl = sg_cpu->walt_load.nl;

	unsigned long cpu_util = sg_cpu->util;

	bool is_hiload;

	unsigned long pl = sg_cpu->walt_load.pl;



	if (unlikely(!sysctl_sched_use_walt_cpu_util))

		return;
@@ -393,8 +403,11 @@ static void sugov_walt_adjust(struct sugov_cpu *sg_cpu, unsigned long *util, 
	if (is_hiload && nl >= mult_frac(cpu_util, NL_RATIO, 100))

		*util = *max;



	if (sg_policy->tunables->pl)

		*util = max(*util, sg_cpu->walt_load.pl);

	if (sg_policy->tunables->pl) {

		if (conservative_pl())

			pl = mult_frac(pl, TARGET_LOAD, 100);

		*util = max(*util, pl);

	}

}



static void sugov_update_single(struct update_util_data *hook, u64 time,

kernel/sched/sched.h

+0 −1
Original line number Diff line number Diff line
@@ -2123,7 +2123,6 @@ cpu_util_freq_walt(int cpu, struct sched_walt_cpu_load *walt_load) 


		nl = div64_u64(nl * (100 + boost),

		walt_cpu_util_freq_divisor);

		pl = div64_u64(pl * (100 + boost), 100);



		walt_load->prev_window_util = util;

		walt_load->nl = nl;

kernel/sched/walt.c

+1 −0
Original line number Diff line number Diff line
@@ -922,6 +922,7 @@ void set_window_start(struct rq *rq) 
unsigned int max_possible_efficiency = 1;

unsigned int min_possible_efficiency = UINT_MAX;



unsigned int sysctl_sched_conservative_pl;

unsigned int sysctl_sched_many_wakeup_threshold = 1000;



#define INC_STEP 8

kernel/sysctl.c

+9 −0
Original line number Diff line number Diff line
@@ -370,6 +370,15 @@ static struct ctl_table kern_table[] = { 
		.extra1		= &neg_three,

		.extra2		= &three,

	},

	{

		.procname	= "sched_conservative_pl",

		.data		= &sysctl_sched_conservative_pl,

		.maxlen		= sizeof(unsigned int),

		.mode		= 0644,

		.proc_handler	= proc_dointvec_minmax,

		.extra1		= &zero,

		.extra2		= &one,

	},

	{

		.procname	= "sched_many_wakeup_threshold",

		.data		= &sysctl_sched_many_wakeup_threshold,