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

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Date:   Mon, 21 Jun 2021 21:38:11 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     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-users@...r.kernel.org,
        Tzvetomir Stoyanov <tz.stoyanov@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Claire Jensen <cjense@...gle.com>
Cc:     eranian@...gle.com, Ian Rogers <irogers@...gle.com>
Subject: [PATCH 4/4] libtraceevent: Increase libtraceevent logging when verbose

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/

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/debug.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
index 2c06abf6dcd2..7e085d7cd8a9 100644
--- a/tools/perf/util/debug.c
+++ b/tools/perf/util/debug.c
@@ -24,6 +24,9 @@
 #include "util/parse-sublevel-options.h"
 
 #include <linux/ctype.h>
+#include <traceevent/event-parse.h>
+
+#define MAKE_LIBTRACEEVENT_VERSION(a, b, c) ((a)*255*255+(b)*255+(c))
 
 int verbose;
 int debug_peo_args;
@@ -228,6 +231,15 @@ 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;
 }
 
-- 
2.32.0.288.g62a8d224e6-goog