[PATCH v1 3/5] libtraceevent: Increase libtraceevent logging when verbose

[Ian Rogers]

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/

Based on previously reverted change:
https://lore.kernel.org/linux-perf-users/20210923001024.550263-4-irogers@xxxxxxxxxx/
that was reverted due to -Itools/lib being in CFLAGS meaning the
traceevent headers couldn't be properly used from the system.

Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
---
 tools/perf/util/debug.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
index 65e6c22f38e4..cd575460818f 100644
--- a/tools/perf/util/debug.c
+++ b/tools/perf/util/debug.c
@@ -22,6 +22,7 @@
 #include "ui/helpline.h"
 #include "ui/ui.h"
 #include "util/parse-sublevel-options.h"
+#include "util/trace-event.h"
 
 #include <linux/ctype.h>
 
@@ -228,6 +229,15 @@ 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
+	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;
 }
 
-- 
2.39.0.314.g84b9a713c41-goog