perf probe: Support multiple probes on different binaries
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>
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 921bb69..2df23e1 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -78,6 +78,11 @@
}
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 @@
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 @@
if (!tmp)
return -ENOMEM;
}
+ free(params.target);
params.target = tmp;
ret = 0;
}
@@ -487,7 +493,6 @@
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);