linux-kernel - Re: [PATCH v3 4/4] libtraceevent: Increase libtraceevent logging when verbose

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Date:   Thu, 16 Dec 2021 09:07:50 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-trace-devel@...r.kernel.org,
        Tzvetomir Stoyanov <tz.stoyanov@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     eranian@...gle.com
Subject: Re: [PATCH v3 4/4] libtraceevent: Increase libtraceevent logging when
 verbose

Hi,

On 23. 09. 21, 2:10, Ian Rogers wrote:
> libtraceevent has added more levels of debug printout and with changes
> like:
> https://lore.kernel.org/linux-trace-devel/20210507095022.1079364-3-tz.stoyanov@gmail.com
> previously generated output like "registering plugin" is no longer
> displayed. This change makes it so that if perf's verbose debug output
> is enabled then the debug and info libtraceevent messages can be
> displayed.
> The code is conditionally enabled based on the libtraceevent version as
> discussed in the RFC:
> https://lore.kernel.org/lkml/20210610060643.595673-1-irogers@google.com/
> 
> v2. Is a rebase and handles the case of building without
>      LIBTRACEEVENT_DYNAMIC.

It breaks build with LIBTRACEEVENT_DYNAMIC and version 1.3.0:
 > util/debug.c: In function ‘perf_debug_option’:
 > util/debug.c:243:17: error: implicit declaration of function 
‘tep_set_loglevel’ [-Werror=implicit-function-declaration]
 >   243 |                 tep_set_loglevel(TEP_LOG_INFO);
 >       |                 ^~~~~~~~~~~~~~~~
 > util/debug.c:243:34: error: ‘TEP_LOG_INFO’ undeclared (first use in 
this function); did you mean ‘TEP_PRINT_INFO’?
 >   243 |                 tep_set_loglevel(TEP_LOG_INFO);
 >       |                                  ^~~~~~~~~~~~
 >       |                                  TEP_PRINT_INFO
 > util/debug.c:243:34: note: each undeclared identifier is reported 
only once for each function it appears in
 > util/debug.c:245:34: error: ‘TEP_LOG_DEBUG’ undeclared (first use in 
this function)
 >   245 |                 tep_set_loglevel(TEP_LOG_DEBUG);
 >       |                                  ^~~~~~~~~~~~~
 > util/debug.c:247:34: error: ‘TEP_LOG_ALL’ undeclared (first use in 
this function)
 >   247 |                 tep_set_loglevel(TEP_LOG_ALL);
 >       |                                  ^~~~~~~~~~~

It is because the gcc's command line looks like:
gcc
...
-I/home/abuild/rpmbuild/BUILD/tools/lib/
...
-DLIBTRACEEVENT_VERSION=65790
...

So:


> --- a/tools/perf/util/debug.c
> +++ b/tools/perf/util/debug.c
> @@ -24,6 +24,16 @@
>   #include "util/parse-sublevel-options.h"
>   
>   #include <linux/ctype.h>
> +#include <traceevent/event-parse.h>

/home/abuild/rpmbuild/BUILD/tools/lib/traceevent/event-parse.h is taken 
here.

> @@ -228,6 +238,15 @@ int perf_debug_option(const char *str)
>   	/* Allow only verbose value in range (0, 10), otherwise set 0. */
>   	verbose = (verbose < 0) || (verbose > 10) ? 0 : verbose;
>   
> +#if MAKE_LIBTRACEEVENT_VERSION(1, 3, 0) <= LIBTRACEEVENT_VERSION

But
-DLIBTRACEEVENT_VERSION=65790
is taken here (which is 1.3.0).

> +	if (verbose == 1)
> +		tep_set_loglevel(TEP_LOG_INFO);
> +	else if (verbose == 2)
> +		tep_set_loglevel(TEP_LOG_DEBUG);
> +	else if (verbose >= 3)
> +		tep_set_loglevel(TEP_LOG_ALL);
> +#endif
> +
>   	return 0;
>   }
>   

regards,
-- 
js
suse labs