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Commit 7d806449 authored by Tengfei Fan's avatar Tengfei Fan
Browse files

sched/walt: consider average max_nr when compare max_nr 



There is frequent Ping-Pong effect if only consider max_nr
in core control, so also consider average max_nr which in
many windows, this will make core control more smooth.

Change-Id: Ic5f3285db604357f7c953b02ec40379ac49b95e0
Signed-off-by: default avatarTengfei Fan <tengfeif@codeaurora.org>
parent 55572f84

kernel/sched/walt/core_ctl.c

+23 −1
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <trace/events/sched.h>

#include "qc_vas.h"



#define MAX_NR_HISTORY_COUNT	2

struct cluster_data {

	bool inited;

	unsigned int min_cpus;
@@ -33,6 +34,8 @@ struct cluster_data { 
	unsigned int need_cpus;

	unsigned int task_thres;

	unsigned int max_nr;

	unsigned int max_nr_avg;

	unsigned int max_nr_history[MAX_NR_HISTORY_COUNT];

	unsigned int nr_prev_assist;

	unsigned int nr_prev_assist_thresh;

	s64 need_ts;
@@ -545,6 +548,23 @@ static int compute_cluster_max_nr(int index) 
	return max_nr;

}



static int compute_cluster_average_max_nr(int index, unsigned int max_nr)

{

	struct cluster_data *cluster = &cluster_state[index];

	u32 *hist = &cluster->max_nr_history[0];

	int idx, sum = 0;



	for (idx = MAX_NR_HISTORY_COUNT - 1; idx > 0; idx--) {

		hist[idx] = hist[idx-1];

		sum += hist[idx];

	}



	hist[0] = max_nr;

	sum += hist[0];



	return DIV_ROUND_UP(sum, MAX_NR_HISTORY_COUNT);

}



static int cluster_real_big_tasks(int index)

{

	int nr_big = 0;
@@ -681,6 +701,7 @@ static void update_running_avg(void) 


		cluster->nrrun = nr_need + prev_misfit_need;

		cluster->max_nr = compute_cluster_max_nr(index);

		cluster->max_nr_avg = compute_cluster_average_max_nr(index, cluster->max_nr);

		cluster->nr_prev_assist = prev_cluster_nr_need_assist(index);



		cluster->strict_nrrun = compute_cluster_nr_strict_need(index);
@@ -723,7 +744,8 @@ static unsigned int apply_task_need(const struct cluster_data *cluster, 
	 * If any CPU has more than MAX_NR_THRESHOLD in the last

	 * window, bring another CPU to help out.

	 */

	if (cluster->max_nr > MAX_NR_THRESHOLD)

	if (cluster->max_nr > MAX_NR_THRESHOLD &&

	    cluster->max_nr_avg > MAX_NR_THRESHOLD)

		new_need = new_need + 1;



	/*