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Commit e53a6319 authored by Steven Rostedt's avatar Steven Rostedt Committed by Ingo Molnar
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ftrace: let function tracing and function return run together 



Impact: feature

This patch enables function tracing and function return to run together.
I've tested this by enabling the stack tracer and return tracer, where
both the function entry and function return are used together with
dynamic ftrace.

Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 5a45cfe1

kernel/trace/ftrace.c

+2 −20
Original line number Diff line number Diff line
@@ -53,9 +53,6 @@ static int ftrace_pid_trace = -1; 
/* Quick disabling of function tracer. */

int function_trace_stop;



/* By default, current tracing type is normal tracing. */

enum ftrace_tracing_type_t ftrace_tracing_type = FTRACE_TYPE_ENTER;



/*

 * ftrace_disabled is set when an anomaly is discovered.

 * ftrace_disabled is much stronger than ftrace_enabled.
@@ -1576,15 +1573,9 @@ int register_ftrace_function(struct ftrace_ops *ops) 


	mutex_lock(&ftrace_sysctl_lock);



	if (ftrace_tracing_type == FTRACE_TYPE_RETURN) {

		ret = -EBUSY;

		goto out;

	}



	ret = __register_ftrace_function(ops);

	ftrace_startup(0);



out:

	mutex_unlock(&ftrace_sysctl_lock);

	return ret;

}
@@ -1731,23 +1722,16 @@ int register_ftrace_graph(trace_func_graph_ret_t retfunc, 


	mutex_lock(&ftrace_sysctl_lock);



	/*

	 * Don't launch return tracing if normal function

	 * tracing is already running.

	 */

	if (ftrace_trace_function != ftrace_stub) {

		ret = -EBUSY;

		goto out;

	}

	atomic_inc(&ftrace_graph_active);

	ret = start_graph_tracing();

	if (ret) {

		atomic_dec(&ftrace_graph_active);

		goto out;

	}

	ftrace_tracing_type = FTRACE_TYPE_RETURN;



	ftrace_graph_return = retfunc;

	ftrace_graph_entry = entryfunc;



	ftrace_startup(FTRACE_START_FUNC_RET);



out:
@@ -1763,8 +1747,6 @@ void unregister_ftrace_graph(void) 
	ftrace_graph_return = (trace_func_graph_ret_t)ftrace_stub;

	ftrace_graph_entry = (trace_func_graph_ent_t)ftrace_stub;

	ftrace_shutdown(FTRACE_STOP_FUNC_RET);

	/* Restore normal tracing type */

	ftrace_tracing_type = FTRACE_TYPE_ENTER;



	mutex_unlock(&ftrace_sysctl_lock);

}