[was: libtraceevent: Increase libtraceevent logging when verbose]

[Jiri Slaby]

Ping -- perf build is still broken in 5.16-rc8 due to this.

On 16. 12. 21, 9:07, Jiri Slaby wrote:
> 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@xxxxxxxxx 
> >
> > 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@xxxxxxxxxx/
> >
> > 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