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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
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+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;
+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
+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