perf probe: Change event list format

Change event list format for user readability. perf probe --list
shows event list in "[GROUP:EVENT] EVENT-DEFINITION" format, but
this format is different from the output of perf-list, and
EVENT-DEFINITION is a bit blunt. This patch changes the format to
more user friendly one.

Before:
[probe:schedule_0]	schedule+10 prev cpu

After:
  probe:schedule_0                         (on schedule+10 with prev cpu)

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
LKML-Reference: <20091208220240.10142.42916.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 25 insertions, 2 deletions

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 88e18044993..a20e3827324 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -379,11 +379,29 @@ static void clear_probe_point(struct probe_point *pp)
         memset(pp, 0, sizeof(pp));
 }
 
+/* Show an event */
+static void show_perf_probe_event(const char *group, const char *event,
+                                  const char *place, struct probe_point *pp)
+{
+        int i;
+        char buf[128];
+
+        e_snprintf(buf, 128, "%s:%s", group, event);
+        printf("  %-40s (on %s", buf, place);
+
+        if (pp->nr_args > 0) {
+                printf(" with");
+                for (i = 0; i < pp->nr_args; i++)
+                        printf(" %s", pp->args[i]);
+        }
+        printf(")\n");
+}
+
 /* List up current perf-probe events */
 void show_perf_probe_events(void)
 {
         unsigned int i;
-        int fd;
+        int fd, nr;
         char *group, *event;
         struct probe_point pp;
         struct strlist *rawlist;
@@ -396,8 +414,13 @@ void show_perf_probe_events(void)
         for (i = 0; i < strlist__nr_entries(rawlist); i++) {
                 ent = strlist__entry(rawlist, i);
                 parse_trace_kprobe_event(ent->s, &group, &event, &pp);
+                /* Synthesize only event probe point */
+                nr = pp.nr_args;
+                pp.nr_args = 0;
                 synthesize_perf_probe_event(&pp);
-                printf("[%s:%s]\t%s\n", group, event, pp.probes[0]);
+                pp.nr_args = nr;
+                /* Show an event */
+                show_perf_probe_event(group, event, pp.probes[0], &pp);
                 free(group);
                 free(event);
                 clear_probe_point(&pp);