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Commit 84370f93 authored by Steve Muckle's avatar Steve Muckle
Browse files

sched: extend sched_task_load tracepoint to indicate sync wakeup 



Sync wakeups provide a hint to the scheduler about upcoming task
activity. Knowing which wakeups are sync wakeups from logs will
assist in workload analysis.

Change-Id: I6ffe73f2337e56b8234d4097069d5d70ab045eda
Signed-off-by: default avatarSteve Muckle <smuckle@codeaurora.org>
parent ee9ddb5f

include/trace/events/sched.h

+8 −4
Original line number Diff line number Diff line
@@ -116,9 +116,10 @@ TRACE_EVENT(sched_enq_deq_task, 


TRACE_EVENT(sched_task_load,



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

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

		 int sync),



	TP_ARGS(p, small_task, boost, reason),

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



	TP_STRUCT__entry(

		__array(	char,	comm,	TASK_COMM_LEN	)
@@ -130,6 +131,7 @@ TRACE_EVENT(sched_task_load, 
		__field(	int,	small_task		)

		__field(	int,	boost			)

		__field(	int,	reason			)

		__field(	int,	sync			)

	),



	TP_fast_assign(
@@ -142,12 +144,14 @@ TRACE_EVENT(sched_task_load, 
		__entry->small_task	= small_task;

		__entry->boost		= boost;

		__entry->reason		= reason;

		__entry->sync		= sync;

	),



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

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

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

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

		__entry->small_task, __entry->boost, __entry->reason)

		__entry->small_task, __entry->boost, __entry->reason,

		__entry->sync)

);



TRACE_EVENT(sched_cpu_load,

kernel/sched/fair.c

+1 −1
Original line number Diff line number Diff line
@@ -1915,7 +1915,7 @@ static int select_best_cpu(struct task_struct *p, int target, int reason, 
	int cstate, min_cstate = INT_MAX;

	int prefer_idle = reason ? 1 : sysctl_sched_prefer_idle;



	trace_sched_task_load(p, small_task, boost, reason);

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



	if (small_task && !boost) {

		best_cpu = best_small_task_cpu(p, sync);