[PATCH v2] perf probe: Fix to delete multiple probe event

[PATCH v2] perf probe: Fix to delete multiple probe event

[Masami Hiramatsu]

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

Fixes: 72363540c009 ("perf probe: Support multiprobe event")
Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Reported-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 v2:
  - Forward port on the latest perf/urgent tree.
  - Add Fixes and Reporters.
---
 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 0f5fda11675f..8c852948513e 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;
 	}

Re: [PATCH v2] perf probe: Fix to delete multiple probe event

[Arnaldo Carvalho de Melo]

Em Fri, Feb 28, 2020 at 04:57:42PM +0900, Masami Hiramatsu escreveu:
> 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

Thanks, tested and applied to perf/urgent.

- Arnaldo
 
> Fixes: 72363540c009 ("perf probe: Support multiprobe event")
> Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
> Reported-by: He Zhe <zhe.he@windriver.com>
> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
> ---
>  v2:
>   - Forward port on the latest perf/urgent tree.
>   - Add Fixes and Reporters.
> ---
>  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 0f5fda11675f..8c852948513e 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;
>  	}
> 

-- 

- Arnaldo

[tip: perf/urgent] perf probe: Fix to delete multiple probe event

[tip-bot2 for Masami Hiramatsu]

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     6b8d68f1ce9266b05a55e93c62923ff51daae4c1
Gitweb:        https://git.kernel.org/tip/6b8d68f1ce9266b05a55e93c62923ff51daae4c1
Author:        Masami Hiramatsu <mhiramat@kernel.org>
AuthorDate:    Fri, 28 Feb 2020 16:57:42 +09:00
Committer:     Arnaldo Carvalho de Melo <acme@redhat.com>
CommitterDate: Mon, 09 Mar 2020 10:41:14 -03:00

perf probe: Fix to delete multiple probe event

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 it:

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

Fixes: 72363540c009 ("perf probe: Support multiprobe event")
Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Reported-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org
Link: http://lore.kernel.org/lkml/158287666197.16697.7514373548551863562.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 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 0f5fda1..8c85294 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;
 	}