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Commit 660c7f9b authored by Steven Rostedt's avatar Steven Rostedt Committed by Ingo Molnar
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ftrace: add thread comm to function graph tracer 



Impact: enhancement to function graph tracer

Export the trace_find_cmdline so the function graph tracer can
use it to print the comms of the threads.

Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e53a6319

kernel/trace/trace.c

+1 −1
Original line number Diff line number Diff line
@@ -804,7 +804,7 @@ static void trace_save_cmdline(struct task_struct *tsk) 
	spin_unlock(&trace_cmdline_lock);

}



static char *trace_find_cmdline(int pid)

char *trace_find_cmdline(int pid)

{

	char *cmdline = "<...>";

	unsigned map;

kernel/trace/trace.h

+1 −0
Original line number Diff line number Diff line
@@ -450,6 +450,7 @@ struct tracer_switch_ops { 
	struct tracer_switch_ops	*next;

};



char *trace_find_cmdline(int pid);

#endif /* CONFIG_CONTEXT_SWITCH_TRACER */



#ifdef CONFIG_DYNAMIC_FTRACE

kernel/trace/trace_functions_graph.c

+16 −5
Original line number Diff line number Diff line
@@ -32,29 +32,40 @@ static pid_t last_pid = -1; 


static int graph_trace_init(struct trace_array *tr)

{

	int cpu;

	int cpu, ret;



	for_each_online_cpu(cpu)

		tracing_reset(tr, cpu);



	return register_ftrace_graph(&trace_graph_return,

	ret = register_ftrace_graph(&trace_graph_return,

					&trace_graph_entry);

	if (ret)

		return ret;

	tracing_start_cmdline_record();



	return 0;

}



static void graph_trace_reset(struct trace_array *tr)

{

	tracing_stop_cmdline_record();

	unregister_ftrace_graph();

}



/* If the pid changed since the last trace, output this event */

static int verif_pid(struct trace_seq *s, pid_t pid)

{

	char *comm;



	if (last_pid != -1 && last_pid == pid)

		return 1;



	last_pid = pid;

	return trace_seq_printf(s, "\n------------8<---------- thread %d"

	comm = trace_find_cmdline(pid);



	return trace_seq_printf(s, "\n------------8<---------- thread %s-%d"

				    " ------------8<----------\n\n",

				  pid);

				    comm, pid);

}



static enum print_line_t