perf probe: Simplify event naming
Simplify event naming as <symbol>_<seqnum>. Each event name is
globally unique (group name is not checked). So, if there is
schedule_0, next probe event on schedule() will be schedule_1.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
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: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091201002024.10235.2353.stgit@harusame>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 7f4f288..e42f3ac 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -403,6 +403,29 @@
strlist__delete(rawlist);
}
+/* Get current perf-probe event names */
+static struct strlist *get_perf_event_names(int fd)
+{
+ unsigned int i;
+ char *group, *event;
+ struct strlist *sl, *rawlist;
+ struct str_node *ent;
+
+ rawlist = get_trace_kprobe_event_rawlist(fd);
+
+ sl = strlist__new(false, NULL);
+ for (i = 0; i < strlist__nr_entries(rawlist); i++) {
+ ent = strlist__entry(rawlist, i);
+ parse_trace_kprobe_event(ent->s, &group, &event, NULL);
+ strlist__add(sl, event);
+ free(group);
+ }
+
+ strlist__delete(rawlist);
+
+ return sl;
+}
+
static int write_trace_kprobe_event(int fd, const char *buf)
{
int ret;
@@ -416,30 +439,46 @@
return ret;
}
+static void get_new_event_name(char *buf, size_t len, const char *base,
+ struct strlist *namelist)
+{
+ int i, ret;
+ for (i = 0; i < MAX_EVENT_INDEX; i++) {
+ ret = e_snprintf(buf, len, "%s_%d", base, i);
+ if (ret < 0)
+ die("snprintf() failed: %s", strerror(-ret));
+ if (!strlist__has_entry(namelist, buf))
+ break;
+ }
+ if (i == MAX_EVENT_INDEX)
+ die("Too many events are on the same function.");
+}
+
void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
{
int i, j, fd;
struct probe_point *pp;
char buf[MAX_CMDLEN];
+ char event[64];
+ struct strlist *namelist;
- fd = open_kprobe_events(O_WRONLY, O_APPEND);
+ fd = open_kprobe_events(O_RDWR, O_APPEND);
+ /* Get current event names */
+ namelist = get_perf_event_names(fd);
for (j = 0; j < nr_probes; j++) {
pp = probes + j;
- if (pp->found == 1) {
- snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x %s\n",
- pp->retprobe ? 'r' : 'p', PERFPROBE_GROUP,
- pp->function, pp->offset, pp->probes[0]);
+ for (i = 0; i < pp->found; i++) {
+ /* Get an unused new event name */
+ get_new_event_name(event, 64, pp->function, namelist);
+ snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s\n",
+ pp->retprobe ? 'r' : 'p',
+ PERFPROBE_GROUP, event,
+ pp->probes[i]);
write_trace_kprobe_event(fd, buf);
- } else
- for (i = 0; i < pp->found; i++) {
- snprintf(buf, MAX_CMDLEN, "%c:%s/%s_%x_%d %s\n",
- pp->retprobe ? 'r' : 'p',
- PERFPROBE_GROUP,
- pp->function, pp->offset, i,
- pp->probes[i]);
- write_trace_kprobe_event(fd, buf);
- }
+ /* Add added event name to namelist */
+ strlist__add(namelist, event);
+ }
}
close(fd);
}