linux-kernel - [PATCH] perf tool: Fix output unexpected messages in quiet mode

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Date:   Mon, 19 Dec 2022 10:49:11 +0800
From:   Yang Jihong <yangjihong1@...wei.com>
To:     <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
        <mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <irogers@...gle.com>,
        <adrian.hunter@...el.com>, <kan.liang@...ux.intel.com>,
        <kim.phillips@....com>, <german.gomez@....com>,
        <ravi.bangoria@....com>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <yangjihong1@...wei.com>
Subject: [PATCH] perf tool: Fix output unexpected messages in quiet mode

When perf uses quiet mode, perf_quiet_option sets debug_peo_args to -1,
and display_attr incorrectly determines the value of debug_peo_args.
As a result, unexpected information is displayed.

Before:
  # perf record --quiet -- ls > /dev/null
  ------------------------------------------------------------
  perf_event_attr:
    size                             128
    { sample_period, sample_freq }   4000
    sample_type                      IP|TID|TIME|PERIOD
    read_format                      ID|LOST
    disabled                         1
    inherit                          1
    mmap                             1
    comm                             1
    freq                             1
    enable_on_exec                   1
    task                             1
    precise_ip                       3
    sample_id_all                    1
    exclude_guest                    1
    mmap2                            1
    comm_exec                        1
    ksymbol                          1
    bpf_event                        1
  ------------------------------------------------------------
  ...

After:
  # perf record --quiet -- ls > /dev/null
  #

Fixes: ccd26741f5e6 ("perf tool: Provide an option to print perf_event_open args and return value")
Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
 tools/perf/util/debug.h | 2 +-
 tools/perf/util/evsel.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/debug.h b/tools/perf/util/debug.h
index f99468a7f681..f6ab84c93ec0 100644
--- a/tools/perf/util/debug.h
+++ b/tools/perf/util/debug.h
@@ -41,7 +41,7 @@ extern int debug_data_convert;
 
 /* Special macro to print perf_event_open arguments/return value. */
 #define pr_debug2_peo(fmt, ...) {				\
-	if (debug_peo_args)						\
+	if (debug_peo_args > 0)						\
 		pr_debugN(0, pr_fmt(fmt), ##__VA_ARGS__);	\
 	else							\
 		pr_debugN(2, pr_fmt(fmt), ##__VA_ARGS__);	\
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 999dd1700502..45cf144c5d5d 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1775,7 +1775,7 @@ static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
 
 static void display_attr(struct perf_event_attr *attr)
 {
-	if (verbose >= 2 || debug_peo_args) {
+	if (verbose >= 2 || debug_peo_args > 0) {
 		fprintf(stderr, "%.60s\n", graph_dotted_line);
 		fprintf(stderr, "perf_event_attr:\n");
 		perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
-- 
2.30.GIT