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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>
This commit is contained in:
Masami Hiramatsu 2009-11-30 19:20:25 -05:00 committed by Ingo Molnar
parent 4de189fe6e
commit b498ce1f27
2 changed files with 56 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
tools/perf/util/probe-event.c
View File

@ -403,6 +403,29 @@ void show_perf_probe_events(void)
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 @@ static int write_trace_kprobe_event(int fd, const char *buf)
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);
}

3
tools/perf/util/probe-event.h
View File

@ -12,4 +12,7 @@ extern int synthesize_trace_kprobe_event(struct probe_point *pp);
extern void add_trace_kprobe_events(struct probe_point *probes, int nr_probes);
extern void show_perf_probe_events(void);
/* Maximum index number of event-name postfix */
#define MAX_EVENT_INDEX 1024
#endif /*_PROBE_EVENT_H */