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Commit 483fa0ad authored by Steve Muckle's avatar Steve Muckle
Browse files

sched: enable hmp, power aware scheduling for targets with > 4 CPUs 



Enabling and disabling hmp/power-aware scheduling is meant to be done
via kernel command line options. Until that is fully supported however,
take advantage of the fact that current targets with more than 4 CPUs
will need these features.

Change-Id: I4916805881d58eeb54747e4b972816ffc96caae7
Signed-off-by: default avatarSteve Muckle <smuckle@codeaurora.org>
parent 0f7535de

kernel/sched/core.c

+6 −0
Original line number Diff line number Diff line
@@ -8094,6 +8094,12 @@ void __init sched_init(void) 
	int i, j;

	unsigned long alloc_size = 0, ptr;



	if (num_possible_cpus() > 4)

		sched_enable_hmp = sched_enable_power_aware = 1;



	if (sched_enable_hmp)

		pr_info("HMP scheduling enabled.\n");



	BUG_ON(num_possible_cpus() > BITS_PER_LONG);



#ifdef CONFIG_FAIR_GROUP_SCHED

kernel/sched/fair.c

+2 −2
Original line number Diff line number Diff line
@@ -1250,7 +1250,7 @@ unsigned int max_task_load(void) 
#ifdef CONFIG_SCHED_HMP



/* Use this knob to turn on or off HMP-aware task placement logic */

unsigned int __read_mostly sched_enable_hmp = 1;

unsigned int __read_mostly sched_enable_hmp = 0;



/* A cpu can no longer accomodate more tasks if:

 *
@@ -1271,7 +1271,7 @@ unsigned int __read_mostly sysctl_sched_mostly_idle_nr_run = 3; 
 * Control whether or not individual CPU power consumption is used to

 * guide task placement.

 */

unsigned int __read_mostly sched_enable_power_aware = 1;

unsigned int __read_mostly sched_enable_power_aware = 0;



/*

 * This specifies the maximum percent power difference between 2