From ddbd32bb073ccbd75096f66fa526272ecc8b972f Mon Sep 17 00:00:00 2001
From: "lakkyung.jung" <lakkyung.jung@samsung.com>
Date: Mon, 26 Feb 2018 20:35:49 +0900
Subject: [PATCH] sched: ehmp: Add to select initial util type for new task.

Change-Id: Idd792099fb636585f2d620ae7fd3f8405cec142f
Signed-off-by: lakkyung.jung <lakkyung.jung@samsung.com>
---
 kernel/sched/ehmp.c | 90 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 88 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/ehmp.c b/kernel/sched/ehmp.c
index 686933be46de..b3cd7ecd512d 100644
--- a/kernel/sched/ehmp.c
+++ b/kernel/sched/ehmp.c
@@ -60,7 +60,65 @@ static inline struct cpumask *sched_group_cpus(struct sched_group *sg)
 /**********************************************************************
  * task initialization                                                *
  **********************************************************************/
-void exynos_init_entity_util_avg(struct sched_entity *se)
+enum {
+	TYPE_BASE_CFS_RQ_UTIL = 0,
+	TYPE_BASE_INHERIT_PARENT_UTIL,
+	TYPE_MAX_NUM,
+};
+
+static unsigned long init_util_type = TYPE_BASE_CFS_RQ_UTIL;
+static unsigned long init_util_ratio = 25;			/* 25% */
+
+static ssize_t show_initial_util_type(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+        return snprintf(buf, 10, "%ld\n", init_util_type);
+}
+
+static ssize_t store_initial_util_type(struct kobject *kobj,
+                struct kobj_attribute *attr, const char *buf,
+                size_t count)
+{
+        long input;
+
+        if (!sscanf(buf, "%ld", &input))
+                return -EINVAL;
+
+        input = input < 0 ? 0 : input;
+        input = input >= TYPE_MAX_NUM ? TYPE_MAX_NUM - 1 : input;
+
+        init_util_type = input;
+
+        return count;
+}
+
+static ssize_t show_initial_util_ratio(struct kobject *kobj,
+		struct kobj_attribute *attr, char *buf)
+{
+        return snprintf(buf, 10, "%ld\n", init_util_ratio);
+}
+
+static ssize_t store_initial_util_ratio(struct kobject *kobj,
+                struct kobj_attribute *attr, const char *buf,
+                size_t count)
+{
+        long input;
+
+        if (!sscanf(buf, "%ld", &input))
+                return -EINVAL;
+
+        init_util_ratio = !!input;
+
+        return count;
+}
+
+static struct kobj_attribute initial_util_type =
+__ATTR(initial_util_type, 0644, show_initial_util_type, store_initial_util_type);
+
+static struct kobj_attribute initial_util_ratio =
+__ATTR(initial_util_ratio, 0644, show_initial_util_ratio, store_initial_util_ratio);
+
+void base_cfs_rq_util(struct sched_entity *se)
 {
 	struct cfs_rq *cfs_rq = se->cfs_rq;
 	struct sched_avg *sa = &se->avg;
@@ -76,7 +134,7 @@ void exynos_init_entity_util_avg(struct sched_entity *se)
 			if (sa->util_avg > cap)
 				sa->util_avg = cap;
 		} else {
-			sa->util_avg = cap_org >> 2;
+			sa->util_avg = cap_org * init_util_ratio / 100;
 		}
 		/*
 		 * If we wish to restore tuning via setting initial util,
@@ -86,6 +144,32 @@ void exynos_init_entity_util_avg(struct sched_entity *se)
 	}
 }
 
+void base_inherit_parent_util(struct sched_entity *se)
+{
+	struct sched_avg *sa = &se->avg;
+	struct task_struct *p = current;
+
+	sa->util_avg = p->se.avg.util_avg;
+	sa->util_sum = p->se.avg.util_sum;
+}
+
+void exynos_init_entity_util_avg(struct sched_entity *se)
+{
+	int type = init_util_type;
+
+	switch(type) {
+	case TYPE_BASE_CFS_RQ_UTIL:
+		base_cfs_rq_util(se);
+		break;
+	case TYPE_BASE_INHERIT_PARENT_UTIL:
+		base_inherit_parent_util(se);
+		break;
+	default:
+		pr_info("%s: Not support initial util type %ld\n",
+				__func__, init_util_type);
+	}
+}
+
 /**********************************************************************
  * load balance                                                       *
  **********************************************************************/
@@ -1592,6 +1676,8 @@ static struct attribute *ehmp_attrs[] = {
 	&top_overutil_attr.attr,
 	&bot_overutil_attr.attr,
 	&prefer_perf_attr.attr,
+	&initial_util_type.attr,
+	&initial_util_ratio.attr,
 	NULL,
 };
 
-- 
2.20.1