linux-kernel - Re: [PATCH 2/3] perf build: Use libtraceevent from the system

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Date:   Tue, 6 Dec 2022 13:37:27 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 2/3] perf build: Use libtraceevent from the system

Em Tue, Dec 06, 2022 at 01:30:33PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Tue, Dec 06, 2022 at 01:23:45PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Tue, Dec 06, 2022 at 01:20:12PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > 
> > > util/scripting-engines/trace-event-perl.c:104:43: error: ‘struct tep_print_flag_sym’ declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
> > >   104 | static void define_symbolic_values(struct tep_print_flag_sym *field,
> > >       |                                           ^~~~~~~~~~~~~~~~~~
> > > util/scripting-engines/trace-event-perl.c: In function ‘define_symbolic_values’:
> > 
> > This cured it, folding into your patch:
> > 
> > diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
> > index 5b602b6d46854133..0bacb49408f84adf 100644
> > --- a/tools/perf/util/scripting-engines/trace-event-perl.c
> > +++ b/tools/perf/util/scripting-engines/trace-event-perl.c
> > @@ -27,6 +27,7 @@
> >  #include <errno.h>
> >  #include <linux/bitmap.h>
> >  #include <linux/time64.h>
> > +#include <traceevent/event-parse.h>
> >  
> >  #include <stdbool.h>
> >  /* perl needs the following define, right after including stdbool.h */
> 
> Building with NO_LIBTRACEEVENT=1 I get:
> 
>   CC      /tmp/build/perf/util/cap.o
> util/data-convert-bt.c: In function ‘get_tracepoint_field_type’:
> util/data-convert-bt.c:194:36: error: invalid use of undefined type ‘struct tep_format_field’
>   194 |         unsigned long flags = field->flags;
>       |                                    ^~
> util/data-convert-bt.c:196:21: error: ‘TEP_FIELD_IS_STRING’ undeclared (first use in this function)
>   196 |         if (flags & TEP_FIELD_IS_STRING)
>       |                     ^~~~~~~~~~~~~~~~~~~
> util/data-convert-bt.c:196:21: note: each undeclared identifier is reported only once for each function it appears in
> util/data-convert-bt.c:199:23: error: ‘TEP_FIELD_IS_SIGNED’ undeclared (first use in this function)
>   199 |         if (!(flags & TEP_FIELD_IS_SIGNED)) {
>       |                       ^~~~~~~~~~~~~~~~~~~
> util/data-convert-bt.c:201:29: error: ‘TEP_FIELD_IS_LONG’ undeclared (first use in this function)
>   201 |                 if (flags & TEP_FIELD_IS_LONG || flags & TEP_FIELD_IS_POINTER)
>       |                             ^~~~~~~~~~~~~~~~~
> 
> 
> working on it...

Below makes it progress a bit, now to look at the perl Context stuff.

diff --git a/tools/perf/builtin-data.c b/tools/perf/builtin-data.c
index c22d82d2a73c4d96..b2a9a3b7f68d7f6f 100644
--- a/tools/perf/builtin-data.c
+++ b/tools/perf/builtin-data.c
@@ -78,12 +78,13 @@ static int cmd_data_convert(int argc, const char **argv)
 		return bt_convert__perf2json(input_name, to_json, &opts);
 
 	if (to_ctf) {
-#ifdef HAVE_LIBBABELTRACE_SUPPORT
+#if defined(HAVE_LIBBABELTRACE_SUPPORT) && defined(HAVE_LIBTRACEEVENT)
 		return bt_convert__perf2ctf(input_name, to_ctf, &opts);
 #else
 		pr_err("The libbabeltrace support is not compiled in. perf should be "
 		       "compiled with environment variables LIBBABELTRACE=1 and "
-		       "LIBBABELTRACE_DIR=/path/to/libbabeltrace/\n");
+		       "LIBBABELTRACE_DIR=/path/to/libbabeltrace/.\n"
+		       "Check also if libbtraceevent devel files are available.\n");
 		return -1;
 #endif
 	}
diff --git a/tools/perf/util/Build b/tools/perf/util/Build
index c7993fb025cf180f..255bc751d19452f2 100644
--- a/tools/perf/util/Build
+++ b/tools/perf/util/Build
@@ -189,7 +189,10 @@ perf-$(CONFIG_LIBUNWIND)          += unwind-libunwind.o
 perf-$(CONFIG_LIBUNWIND_X86)      += libunwind/x86_32.o
 perf-$(CONFIG_LIBUNWIND_AARCH64)  += libunwind/arm64.o
 
-perf-$(CONFIG_LIBBABELTRACE) += data-convert-bt.o
+ifeq ($(CONFIG_TRACEEVENT),y)
+  perf-$(CONFIG_LIBBABELTRACE) += data-convert-bt.o
+endif
+
 perf-y += data-convert-json.o
 
 perf-y += scripting-engines/