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Commit 65daaca7 authored by Steven Rostedt (Red Hat)'s avatar Steven Rostedt (Red Hat) Committed by Steven Rostedt
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tracing: Allow wakeup tracers to be used by instances 



The wakeup and wakeup_rt tracers can now be used by instances.
But they may only be used by one instance at a time (including the
top level directory). This allows multiple tracers to run while
the wakeup tracer is running simultaneously.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 0b9b12c1

kernel/trace/trace_sched_wakeup.c

+16 −0
Original line number Diff line number Diff line
@@ -601,6 +601,8 @@ static void stop_wakeup_tracer(struct trace_array *tr) 
	unregister_trace_sched_migrate_task(probe_wakeup_migrate_task, NULL);

}



static bool wakeup_busy;



static int __wakeup_tracer_init(struct trace_array *tr)

{

	save_flags = trace_flags;
@@ -613,11 +615,16 @@ static int __wakeup_tracer_init(struct trace_array *tr) 
	wakeup_trace = tr;

	ftrace_init_array_ops(tr, wakeup_tracer_call);

	start_wakeup_tracer(tr);



	wakeup_busy = true;

	return 0;

}



static int wakeup_tracer_init(struct trace_array *tr)

{

	if (wakeup_busy)

		return -EBUSY;



	wakeup_dl = 0;

	wakeup_rt = 0;

	return __wakeup_tracer_init(tr);
@@ -625,6 +632,9 @@ static int wakeup_tracer_init(struct trace_array *tr) 


static int wakeup_rt_tracer_init(struct trace_array *tr)

{

	if (wakeup_busy)

		return -EBUSY;



	wakeup_dl = 0;

	wakeup_rt = 1;

	return __wakeup_tracer_init(tr);
@@ -632,6 +642,9 @@ static int wakeup_rt_tracer_init(struct trace_array *tr) 


static int wakeup_dl_tracer_init(struct trace_array *tr)

{

	if (wakeup_busy)

		return -EBUSY;



	wakeup_dl = 1;

	wakeup_rt = 0;

	return __wakeup_tracer_init(tr);
@@ -649,6 +662,7 @@ static void wakeup_tracer_reset(struct trace_array *tr) 
	set_tracer_flag(tr, TRACE_ITER_LATENCY_FMT, lat_flag);

	set_tracer_flag(tr, TRACE_ITER_OVERWRITE, overwrite_flag);

	ftrace_reset_array_ops(tr);

	wakeup_busy = false;

}



static void wakeup_tracer_start(struct trace_array *tr)
@@ -680,6 +694,7 @@ static struct tracer wakeup_tracer __read_mostly = 
#endif

	.open		= wakeup_trace_open,

	.close		= wakeup_trace_close,

	.allow_instances = true,

	.use_max_tr	= true,

};
@@ -702,6 +717,7 @@ static struct tracer wakeup_rt_tracer __read_mostly = 
#endif

	.open		= wakeup_trace_open,

	.close		= wakeup_trace_close,

	.allow_instances = true,

	.use_max_tr	= true,

};