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Commit 2d536329 authored by Joonwoo Park's avatar Joonwoo Park
Browse files

sched: update sched_task_load trace event 



Add best_cpu and latency field to sched_task_load trace event.  The latency
field represents combined latency of update_task_ravg(), update_task_ravg()
and select_best_cpu() which is useful to analyze latency overhead of HMP
scheduler.

Change-Id: Ie6d777c918d0414d361d758490e3cd7d509f5837
Signed-off-by: default avatarJoonwoo Park <joonwoop@codeaurora.org>
parent f9aa8547

include/trace/events/sched.h

+10 −4
Original line number Diff line number Diff line
@@ -119,9 +119,9 @@ TRACE_EVENT(sched_enq_deq_task, 
TRACE_EVENT(sched_task_load,



	TP_PROTO(struct task_struct *p, int boost, int reason,

		 int sync, int need_idle),

		 int sync, int need_idle, int best_cpu),



	TP_ARGS(p, boost, reason, sync, need_idle),

	TP_ARGS(p, boost, reason, sync, need_idle, best_cpu),



	TP_STRUCT__entry(

		__array(	char,	comm,	TASK_COMM_LEN	)
@@ -134,6 +134,8 @@ TRACE_EVENT(sched_task_load, 
		__field(	int,	reason			)

		__field(	int,	sync			)

		__field(	int,	need_idle		)

		__field(	int,	best_cpu		)

		__field(	u64,	latency			)

	),



	TP_fast_assign(
@@ -147,12 +149,16 @@ TRACE_EVENT(sched_task_load, 
		__entry->reason		= reason;

		__entry->sync		= sync;

		__entry->need_idle	= need_idle;

		__entry->best_cpu	= best_cpu;

		__entry->latency	= p->state == TASK_WAKING ?

					 sched_clock() - p->ravg.mark_start : 0;

	),



	TP_printk("%d (%s): sum=%u, sum_scaled=%u, period=%u demand=%u boost=%d reason=%d sync=%d, need_idle=%d",

	TP_printk("%d (%s): sum=%u, sum_scaled=%u, period=%u demand=%u boost=%d reason=%d sync=%d need_idle=%d best_cpu=%d latency=%llu",

		__entry->pid, __entry->comm, __entry->sum,

		__entry->sum_scaled, __entry->period, __entry->demand,

		__entry->boost, __entry->reason, __entry->sync, __entry->need_idle)

		__entry->boost, __entry->reason, __entry->sync,

		__entry->need_idle, __entry->best_cpu, __entry->latency)

);



TRACE_EVENT(sched_cpu_load,

kernel/sched/fair.c

+1 −1
Original line number Diff line number Diff line
@@ -3057,7 +3057,7 @@ static int select_best_cpu(struct task_struct *p, int target, int reason, 
			best_cpu = best_sibling_cpu;

	}



	trace_sched_task_load(p, boost, reason, sync, need_idle);

	trace_sched_task_load(p, boost, reason, sync, need_idle, best_cpu);



	return best_cpu;

}