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Commit 02f2f764 authored by Steven Rostedt (Red Hat)'s avatar Steven Rostedt (Red Hat) Committed by Steven Rostedt
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tracing: Allow irq/preempt tracers to be used by instances 



The irqsoff, preemptoff and preemptirqsoff 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
irqsoff (and friends) tracer is running simultaneously.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 65daaca7

kernel/trace/trace_irqsoff.c

+17 −7
Original line number Diff line number Diff line
@@ -597,8 +597,13 @@ static void stop_irqsoff_tracer(struct trace_array *tr, int graph) 
	unregister_irqsoff_function(tr, graph);

}



static void __irqsoff_tracer_init(struct trace_array *tr)

static bool irqsoff_busy;



static int __irqsoff_tracer_init(struct trace_array *tr)

{

	if (irqsoff_busy)

		return -EBUSY;



	save_flags = trace_flags;



	/* non overwrite screws up the latency tracers */
@@ -617,6 +622,9 @@ static void __irqsoff_tracer_init(struct trace_array *tr) 
	if (start_irqsoff_tracer(tr, (tr->flags & TRACE_ARRAY_FL_GLOBAL &&

				      is_graph())))

		printk(KERN_ERR "failed to start irqsoff tracer\n");



	irqsoff_busy = true;

	return 0;

}



static void irqsoff_tracer_reset(struct trace_array *tr)
@@ -629,6 +637,8 @@ static void irqsoff_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);



	irqsoff_busy = false;

}



static void irqsoff_tracer_start(struct trace_array *tr)
@@ -646,8 +656,7 @@ static int irqsoff_tracer_init(struct trace_array *tr) 
{

	trace_type = TRACER_IRQS_OFF;



	__irqsoff_tracer_init(tr);

	return 0;

	return __irqsoff_tracer_init(tr);

}

static struct tracer irqsoff_tracer __read_mostly =

{
@@ -667,6 +676,7 @@ static struct tracer irqsoff_tracer __read_mostly = 
#endif

	.open           = irqsoff_trace_open,

	.close          = irqsoff_trace_close,

	.allow_instances = true,

	.use_max_tr	= true,

};

# define register_irqsoff(trace) register_tracer(&trace)
@@ -679,8 +689,7 @@ static int preemptoff_tracer_init(struct trace_array *tr) 
{

	trace_type = TRACER_PREEMPT_OFF;



	__irqsoff_tracer_init(tr);

	return 0;

	return __irqsoff_tracer_init(tr);

}



static struct tracer preemptoff_tracer __read_mostly =
@@ -701,6 +710,7 @@ static struct tracer preemptoff_tracer __read_mostly = 
#endif

	.open		= irqsoff_trace_open,

	.close		= irqsoff_trace_close,

	.allow_instances = true,

	.use_max_tr	= true,

};

# define register_preemptoff(trace) register_tracer(&trace)
@@ -715,8 +725,7 @@ static int preemptirqsoff_tracer_init(struct trace_array *tr) 
{

	trace_type = TRACER_IRQS_OFF | TRACER_PREEMPT_OFF;



	__irqsoff_tracer_init(tr);

	return 0;

	return __irqsoff_tracer_init(tr);

}



static struct tracer preemptirqsoff_tracer __read_mostly =
@@ -737,6 +746,7 @@ static struct tracer preemptirqsoff_tracer __read_mostly = 
#endif

	.open		= irqsoff_trace_open,

	.close		= irqsoff_trace_close,

	.allow_instances = true,

	.use_max_tr	= true,

};