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perf probe: List probes in stdout 

Since commit 5e17b28f1e ("perf probe: Add --quiet option to
suppress output result message") have replaced printf with pr_info,
perf probe -l outputs its result in stderr. However, that is not
what the commit expected.

E.g.:

  # perf probe -l > /dev/null
    probe:vfs_read       (on vfs_read@ksrc/linux-3/fs/read_write.c)

With this fix:

  # perf probe -l > list
  # cat list
    probe:vfs_read       (on vfs_read@ksrc/linux-3/fs/read_write.c)

Of course, --quiet(-q) still works on --add/--del.

  # perf probe -q vfs_write
  # perf probe -l
    probe:vfs_read       (on vfs_read@ksrc/linux-3/fs/read_write.c)
    probe:vfs_write      (on vfs_write@ksrc/linux-3/fs/read_write.c)
  -----

Reported-by: Naohiro Aota <naota@elisp.net>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naohiro Aota <naota@elisp.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150613013116.24402.2923.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu 2015-06-13 10:31:16 +09:00 committed by Arnaldo Carvalho de Melo
parent a35489a6a2
commit ba7ecb02e7
1 changed files with 35 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
tools/perf/util/probe-event.c
View File

@ -2126,9 +2126,9 @@ kprobe_blacklist__find_by_address(struct list_head *blacklist,
return NULL;
}
/* Show an event */
static int show_perf_probe_event(struct perf_probe_event *pev,
const char *module)
static int perf_probe_event__sprintf(struct perf_probe_event *pev,
const char *module,
struct strbuf *result)
{
int i, ret;
char buf[128];
@ -2141,27 +2141,47 @@ static int show_perf_probe_event(struct perf_probe_event *pev,
ret = e_snprintf(buf, 128, "%s:%s", pev->group, pev->event);
if (ret < 0)
return ret;
goto out;
pr_info(" %-20s (on %s", buf, place);
strbuf_addf(result, " %-20s (on %s", buf, place);
if (module)
pr_info(" in %s", module);
strbuf_addf(result, " in %s", module);
if (pev->nargs > 0) {
pr_info(" with");
strbuf_addstr(result, " with");
for (i = 0; i < pev->nargs; i++) {
ret = synthesize_perf_probe_arg(&pev->args[i],
buf, 128);
if (ret < 0)
break;
pr_info(" %s", buf);
goto out;
strbuf_addf(result, " %s", buf);
}
}
pr_info(")\n");
strbuf_addch(result, ')');
out:
free(place);
return ret;
}
/* Show an event */
static int show_perf_probe_event(struct perf_probe_event *pev,
const char *module, bool use_stdout)
{
struct strbuf buf = STRBUF_INIT;
int ret;
ret = perf_probe_event__sprintf(pev, module, &buf);
if (ret >= 0) {
if (use_stdout)
printf("%s\n", buf.buf);
else
pr_info("%s\n", buf.buf);
}
strbuf_release(&buf);
return ret;
}
static bool filter_probe_trace_event(struct probe_trace_event *tev,
struct strfilter *filter)
{
@ -2200,9 +2220,10 @@ static int __show_perf_probe_events(int fd, bool is_kprobe,
goto next;
ret = convert_to_perf_probe_event(&tev, &pev,
is_kprobe);
if (ret >= 0)
ret = show_perf_probe_event(&pev,
tev.point.module);
if (ret < 0)
goto next;
ret = show_perf_probe_event(&pev, tev.point.module,
true);
}
next:
clear_perf_probe_event(&pev);
@ -2468,7 +2489,7 @@ static int __add_probe_trace_events(struct perf_probe_event *pev,
group = pev->group;
pev->event = tev->event;
pev->group = tev->group;
show_perf_probe_event(pev, tev->point.module);
show_perf_probe_event(pev, tev->point.module, false);
/* Trick here - restore current event/group */
pev->event = (char *)event;
pev->group = (char *)group;