Re: [PATCHES v3 0/2] perf tools: Add cached probe type detection for evsel

[Namhyung Kim]

On Thu, Jun 18, 2026 at 10:32:55AM -0300, Arnaldo Carvalho de Melo wrote:
> On Wed, Jun 17, 2026 at 03:48:15PM -0700, Namhyung Kim wrote:
> > On Tue, Jun 16, 2026 at 03:25:44PM -0300, Arnaldo Carvalho de Melo wrote:
> > > 
> > > Arnaldo Carvalho de Melo (3):
> > >   perf evsel: Add lazy-initialized probe type detection helpers
> > >   perf trace: Guard __probe_ip suppression with evsel__is_probe()
> > >   perf evsel: Add no-libtraceevent stubs for evsel__field() and evsel__common_field()
> > 
> > It seems you squashed patch 3 into 1. :)
> 
> Yeah, I noticed and fixed it up before pushing publicly:
> 
> acme@x1:~/git/perf-tools-next$ git log --oneline 27dc372c83d90ccbb19107a2acffe01d6a076a53^.. | tail -3
> 846f367ff02226e7 perf trace: Guard __probe_ip suppression with evsel__is_probe()
> fbb5e6e3ca28a325 perf evsel: Add lazy-initialized probe type detection helpers
> 27dc372c83d90ccb perf evsel: Add no-libtraceevent stubs for evsel__field() and evsel__common_field()
> acme@x1:~/git/perf-tools-next$

Thanks, looks good to me.  For the series,

Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>

Thanks,
Namhyung

> 
> acme@x1:~/git/perf-tools-next$ git show 27dc372c83d90ccb
> commit 27dc372c83d90ccbb19107a2acffe01d6a076a53
> Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> Date:   Tue Jun 16 16:37:09 2026 -0300
> 
>     perf evsel: Add no-libtraceevent stubs for evsel__field() and evsel__common_field()
> 
>     When building without libtraceevent (NO_LIBTRACEEVENT=1), evsel__field()
>     and evsel__common_field() are declared but never defined, causing link
>     errors in any code path that references them.
> 
>     Add inline stubs that return NULL when HAVE_LIBTRACEEVENT is not defined,
>     matching the pattern used by other evsel accessor functions.
> 
>     Cc: Aaron Tomlin <atomlin@xxxxxxxxxxx>
>     Assisted-by: Claude:claude-opus-4.6
>     Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> 
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 8009be22cc3f1055..b959d4797b14035d 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -397,8 +397,22 @@ struct tep_format_field;
> 
>  u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample, bool needs_swap);
> 
> +#ifdef HAVE_LIBTRACEEVENT
>  struct tep_format_field *evsel__field(struct evsel *evsel, const char *name);
>  struct tep_format_field *evsel__common_field(struct evsel *evsel, const char *name);
> +#else
> +static inline struct tep_format_field *
> +evsel__field(struct evsel *evsel __maybe_unused, const char *name __maybe_unused)
> +{
> +       return NULL;
> +}
> +
> +static inline struct tep_format_field *
> +evsel__common_field(struct evsel *evsel __maybe_unused, const char *name __maybe_unused)
> +{
> +       return NULL;
> +}
> +#endif
> 
>  bool __evsel__match(const struct evsel *evsel, u32 type, u64 config);
> 
> acme@x1:~/git/perf-tools-next$
> 
> acme@x1:~/git/perf-tools-next$ git show 846f367ff02226e7
> commit 846f367ff02226e7089181d2adae45a6cca4a3e6 (number/perf/evsel-probe-type)
> Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> Date:   Mon Jun 15 22:17:41 2026 -0300
> 
>     perf trace: Guard __probe_ip suppression with evsel__is_probe()
> 
>     trace__fprintf_tp_fields() compares every field name against
>     "__probe_ip" for all tracepoint events, but this field is only
>     implicitly added by the Ftrace subsystem to bare dynamic probes.
> 
>     Add an evsel__is_probe() check before the strcmp so the string
>     comparison is skipped entirely for non-probe events.
> 
>     Reviewed-by: Aaron Tomlin <atomlin@xxxxxxxxxxx>
>     Assisted-by: Claude:claude-opus-4.6
>     Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
> 
> diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
> index a8492da23a9cc178..57f3f14c5d435805 100644
> --- a/tools/perf/builtin-trace.c
> +++ b/tools/perf/builtin-trace.c
> @@ -3267,7 +3267,7 @@ static size_t trace__fprintf_tp_fields(struct trace *trace, struct perf_sample *
>                  * If verbose mode is enabled, ensure it is formatted as a
>                  * hexadecimal memory address rather than a signed integer.
>                  */
> -               if (!strcmp(field->name, "__probe_ip")) {
> +               if (evsel__is_probe(evsel) && !strcmp(field->name, "__probe_ip")) {
>                         if (!verbose)
>                                 continue;
> 
> acme@x1:~/git/perf-tools-next$