[PATCH] perf: Fix "Track with sched_switch" test by not printing warnings in quiet mode

From: James Clark
Date: Wed Oct 12 2022 - 07:10:45 EST


Especially when CONFIG_LOCKDEP and other debug configs are enabled,
Perf can print the following warning when running the "Track with
sched_switch" test:

Warning:
Processed 1378918 events and lost 4 chunks!

Check IO/CPU overload!

Warning:
Processed 4593325 samples and lost 70.00%!

The test already supplies -q to run in quiet mode, so extend quiet mode
to perf_stdio__warning() and also ui__warning() for consistency.

This fixes the following failure due to the extra lines counted:

perf test "lock cont" -vvv

82: kernel lock contention analysis test :
--- start ---
test child forked, pid 3125
Testing perf lock record and perf lock contention
[Fail] Recorded result count is not 1: 9
test child finished with -1
---- end ----
kernel lock contention analysis test: FAILED!

Fixes: ec685de25b67 ("perf test: Add kernel lock contention test")
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: James Clark <james.clark@xxxxxxx>
---
tools/perf/ui/util.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/tools/perf/ui/util.c b/tools/perf/ui/util.c
index 689b27c34246..1d38ddf01b60 100644
--- a/tools/perf/ui/util.c
+++ b/tools/perf/ui/util.c
@@ -15,6 +15,9 @@ static int perf_stdio__error(const char *format, va_list args)

static int perf_stdio__warning(const char *format, va_list args)
{
+ if (quiet)
+ return 0;
+
fprintf(stderr, "Warning:\n");
vfprintf(stderr, format, args);
return 0;
@@ -45,6 +48,8 @@ int ui__warning(const char *format, ...)
{
int ret;
va_list args;
+ if (quiet)
+ return 0;

va_start(args, format);
ret = perf_eops->warning(format, args);
--
2.28.0