trace-graph: Add new cmdlines via sched_switch
The cmdline cache used by ftrace only saves 100 cmdlines. But if
there's more tasks than cmdlines, then we will end up with a lot with
<...>. This looks at sched_switch and will add comms if they are found.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
diff --git a/trace-graph.c b/trace-graph.c
index 1f5e4cf..48a41e6 100644
--- a/trace-graph.c
+++ b/trace-graph.c
@@ -705,7 +705,7 @@
}
static void draw_cpu(struct graph_info *ginfo, gint cpu,
- gint new_width)
+ gint new_width, int read_comms)
{
static PangoFontDescription *font;
PangoLayout *layout;
@@ -721,6 +721,7 @@
gint p1 = 0, p2 = 0, p3 = 0;
gint last_event_id = 0;
gint event_id;
+ const char *comm;
/* Calculate the size of 16 characters */
if (!width_16) {
@@ -757,7 +758,17 @@
x = (gint)((gdouble)ts * ginfo->resolution);
- if (!check_sched_switch(ginfo, record, &pid, NULL))
+ if (check_sched_switch(ginfo, record, &pid, &comm)) {
+ if (read_comms) {
+ /*
+ * First time through, register any missing
+ * comm / pid mappings.
+ */
+ if (!pevent_pid_is_registered(ginfo->pevent, pid))
+ pevent_register_comm(ginfo->pevent,
+ strdup(comm), pid);
+ }
+ } else
pid = pevent_data_pid(ginfo->pevent, record);
event_id = pevent_data_type(ginfo->pevent, record);
@@ -912,6 +923,7 @@
static void draw_info(struct graph_info *ginfo,
gint new_width)
{
+ static int read_comms = 1;
gint cpu;
ginfo->resolution = (gdouble)new_width / (gdouble)(ginfo->view_end_time -
@@ -921,8 +933,9 @@
for (cpu = 0; cpu < ginfo->cpus; cpu++)
- draw_cpu(ginfo, cpu, new_width);
+ draw_cpu(ginfo, cpu, new_width, read_comms);
+ read_comms = 0;
}
static gboolean
