[PATCH] perf probe: Fix to delete multiple probe event

Masami Hiramatsu
2019-12-03T08:02:01Z

Fix to delete multiple probe event with filter correctly.

When we put an event with multiple probes, perf-probe fails
to delete with filters. This comes from a failure to list
up the event name because of overwrapping its name.

To fix this issue, skip to list up the event which has
same name.

Without this patch:
# perf probe -l \*
probe_perf:map__map_ip (on perf_sample__fprintf_brstackoff:21@
probe_perf:map__map_ip (on perf_sample__fprintf_brstackoff:25@
probe_perf:map__map_ip (on append_inlines:12@util/machine.c in
probe_perf:map__map_ip (on unwind_entry:19@util/machine.c in /
probe_perf:map__map_ip (on map__map_ip@util/map.h in /home/mhi
probe_perf:map__map_ip (on map__map_ip@util/map.h in /home/mhi
# perf probe -d \*
"*" does not hit any event.
Error: Failed to delete events. Reason: No such file or directory (Code: -2)

With this:
# perf probe -d \*
Removed event: probe_perf:map__map_ip

Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
tools/perf/util/probe-file.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index 5003ba403345..c03a591d41a4 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -206,6 +206,9 @@ static struct strlist *__probe_file__get_namelist(int fd, bool include_group)
} else
ret = strlist__add(sl, tev.event);
clear_probe_trace_event(&tev);
+ /* Skip if there is same name multi-probe event in the list */
+ if (ret == -EEXIST)
+ ret = 0;
if (ret < 0)
break;
}