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Commit 7d137b0e authored by Olav Haugan's avatar Olav Haugan
Browse files

sched/fair: Limit sync wakeup bias to waker cpu 



Add logic to minimize which sync wakeups gets affected by biasing to
waker cpu. The waking task must have a load of less than 10% while the
waker has to be bigger than 25%.

This helps perfomance is certain use cases.

Change-Id: I8d7adb0634f78396a9b8b330a1ebce3dec95be8c
Signed-off-by: default avatarOlav Haugan <ohaugan@codeaurora.org>
parent a7bbb875

kernel/sched/fair.c

+10 −1
Original line number Diff line number Diff line
@@ -5563,6 +5563,13 @@ static unsigned long __cpu_norm_util(int cpu, unsigned long capacity, int delta) 
	return DIV_ROUND_UP(util << SCHED_CAPACITY_SHIFT, capacity);

}



static inline bool bias_to_waker_cpu_enabled(struct task_struct *wakee,

		struct task_struct *waker)

{

	return task_util(waker) > sched_big_waker_task_load &&

		task_util(wakee) < sched_small_wakee_task_load;

}



static inline bool

bias_to_waker_cpu(struct task_struct *p, int cpu, struct cpumask *rtg_target)

{
@@ -6917,6 +6924,7 @@ static int energy_aware_wake_cpu(struct task_struct *p, int target, int sync) 
	struct related_thread_group *grp;

	cpumask_t search_cpus;

	int prev_cpu = task_cpu(p);

	struct task_struct *curr = cpu_rq(cpu)->curr;

#ifdef CONFIG_SCHED_CORE_ROTATE

	bool do_rotate = false;

	bool avoid_prev_cpu = false;
@@ -6943,7 +6951,8 @@ static int energy_aware_wake_cpu(struct task_struct *p, int target, int sync) 
	if (grp && grp->preferred_cluster)

		rtg_target = &grp->preferred_cluster->cpus;



	if (sync && bias_to_waker_cpu(p, cpu, rtg_target)) {

	if (sync && bias_to_waker_cpu_enabled(p, curr) &&

		bias_to_waker_cpu(p, cpu, rtg_target)) {

		trace_sched_task_util_bias_to_waker(p, prev_cpu,

					task_util(p), cpu, cpu, 0, need_idle);

		return cpu;

kernel/sched/walt.c

+12 −0
Original line number Diff line number Diff line
@@ -162,6 +162,13 @@ static const unsigned int top_tasks_bitmap_size = 
 */

__read_mostly unsigned int sysctl_sched_freq_reporting_policy;





#define SCHED_BIG_WAKER_TASK_LOAD_PCT 25UL

#define SCHED_SMALL_WAKEE_TASK_LOAD_PCT 10UL



__read_mostly unsigned int sched_big_waker_task_load;

__read_mostly unsigned int sched_small_wakee_task_load;



static int __init set_sched_ravg_window(char *str)

{

	unsigned int window_size;
@@ -3116,4 +3123,9 @@ void walt_sched_init(struct rq *rq) 


	walt_cpu_util_freq_divisor =

	    (sched_ravg_window >> SCHED_CAPACITY_SHIFT) * 100;



	sched_big_waker_task_load =

		(SCHED_BIG_WAKER_TASK_LOAD_PCT << SCHED_CAPACITY_SHIFT) / 100;

	sched_small_wakee_task_load =

		(SCHED_SMALL_WAKEE_TASK_LOAD_PCT << SCHED_CAPACITY_SHIFT) / 100;

}