ANDROID: GKI: sched: add rvh for new cfs task util

A vendor hook is added in post_init_entity_util_avg before
a new cfs task's util is attached to cfs_rq's util so that
vendors can gather and modify se's information to modify
scheduling behavior and DVFS as they want.

trace_android_rvh_new_task_stats is not a proper hook because
it is called after the task's util is attached to cfs_rq's util,
which means updating cfs_rq's sched_avg and DVFS request are done.

Bug: 184219858

Signed-off-by: Choonghoon Park <choong.park@samsung.com>
Change-Id: I2deaa93297f8464895978496c9838cdffaa35b7f
(cherry picked from commit 1eea1cbdd3)

include/trace/hooks/sched.h

@@ -367,6 +367,9 @@ DECLARE_HOOK(android_vh_dup_task_struct,
 	TP_PROTO(struct task_struct *tsk, struct task_struct *orig),
 	TP_ARGS(tsk, orig));
 
+DECLARE_RESTRICTED_HOOK(android_rvh_post_init_entity_util_avg,
+	TP_PROTO(struct sched_entity *se),
+	TP_ARGS(se), 1);
 /* macro versions of hooks are no longer required */
 
 #endif /* _TRACE_HOOK_SCHED_H */

kernel/sched/fair.c

@@ -869,6 +869,9 @@ void post_init_entity_util_avg(struct task_struct *p)
 	}
 
 	sa->runnable_avg = sa->util_avg;
+
+	/* Hook before this se's util is attached to cfs_rq's util */
+	trace_android_rvh_post_init_entity_util_avg(se);
 }
 
 #else /* !CONFIG_SMP */

kernel/sched/vendor_hooks.c

@@ -94,3 +94,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_account_process_tick_gran);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_account_task_time);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_dup_task_struct);
 EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_irqtime_account_process_tick);
+EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_post_init_entity_util_avg);