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perf probe: Support multiple probes on different binaries

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Support multiple probes on different binaries with just
one command.

In the result, this example sets up the probes on icmp_rcv in
kernel, on main and set_target in perf, and on pcspkr_event
in pcspker.ko driver.
  -----
  # perf probe -a icmp_rcv -x ./perf -a main -a set_target \
   -m /lib/modules/4.0.0-rc5+/kernel/drivers/input/misc/pcspkr.ko \
   -a pcspkr_event
  Added new event:
    probe:icmp_rcv       (on icmp_rcv)

  You can now use it in all perf tools, such as:

          perf record -e probe:icmp_rcv -aR sleep 1

  Added new event:
    probe_perf:main      (on main in /home/mhiramat/ksrc/linux-3/tools/perf/perf)

  You can now use it in all perf tools, such as:

          perf record -e probe_perf:main -aR sleep 1

  Added new event:
    probe_perf:set_target (on set_target in /home/mhiramat/ksrc/linux-3/tools/perf/perf)

  You can now use it in all perf tools, such as:

          perf record -e probe_perf:set_target -aR sleep 1

  Added new event:
    probe:pcspkr_event   (on pcspkr_event in pcspkr)

  You can now use it in all perf tools, such as:

          perf record -e probe:pcspkr_event -aR sleep 1
  -----

Reported-by: Arnaldo Carvalho de Melo <acme@infradead.org>
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: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20150401102539.17137.46454.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu
2015-04-01 19:25:39 +09:00
committed by Arnaldo Carvalho de Melo
parent 5e78c69b72
commit 7afb3fab39
3 changed files with 13 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
tools/perf/builtin-probe.c
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@@ -78,6 +78,11 @@ static int parse_probe_event(const char *str)
}
pev->uprobes = params.uprobes;
if (params.target) {
pev->target = strdup(params.target);
if (!pev->target)
return -ENOMEM;
}
/* Parse a perf-probe command into event */
ret = parse_perf_probe_command(str, pev);
@@ -178,7 +183,7 @@ static int opt_set_target(const struct option *opt, const char *str,
int ret = -ENOENT;
char *tmp;
if (str && !params.target) {
if (str) {
if (!strcmp(opt->long_name, "exec"))
params.uprobes = true;
#ifdef HAVE_DWARF_SUPPORT
@@ -200,6 +205,7 @@ static int opt_set_target(const struct option *opt, const char *str,
if (!tmp)
return -ENOMEM;
}
free(params.target);
params.target = tmp;
ret = 0;
}
@@ -487,7 +493,6 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
if (params.nevents) {
ret = add_perf_probe_events(params.events, params.nevents,
params.max_probe_points,
params.target,
params.force_add);
if (ret < 0) {
pr_err_with_code(" Error: Failed to add events.", ret);