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: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index b6f0cc2..bbb81e7 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -32,29 +32,40 @@
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)
{
- unregister_ftrace_graph();
+ 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
