[PATCH 13/23] perf kvm: Add -q/--quiet option

[Namhyung Kim <namhyung@kernel.org>]

The -q/--quiet option is to suppress any message.  Sometimes users just
want to run the command and it can be used for that case.

Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/Documentation/perf-kvm.txt |  3 +++
 tools/perf/builtin-kvm.c              | 10 +++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-kvm.txt b/tools/perf/Documentation/perf-kvm.txt
index 6a5bb2b17039..8eec9d13181c 100644
--- a/tools/perf/Documentation/perf-kvm.txt
+++ b/tools/perf/Documentation/perf-kvm.txt
@@ -96,6 +96,9 @@ OPTIONS
 -v::
 --verbose::
 	Be more verbose (show counter open errors, etc).
+-q::
+--quiet::
+	Do not show any message.
 
 STAT REPORT OPTIONS
 -------------------
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 08fa88f62a24..1d121bb0a14d 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1018,7 +1018,7 @@ static int kvm_live_open_events(struct perf_kvm_stat *kvm)
 
 	err = perf_evlist__open(evlist);
 	if (err < 0) {
-		printf("Couldn't create the events: %s\n",
+		pr_err("Couldn't create the events: %s\n",
 		       str_error_r(errno, sbuf, sizeof(sbuf)));
 		goto out;
 	}
@@ -1313,6 +1313,7 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
 			perf_evlist__parse_mmap_pages),
 		OPT_INCR('v', "verbose", &verbose,
 			"be more verbose (show counter open errors, etc)"),
+		OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 		OPT_BOOLEAN('a', "all-cpus", &kvm->opts.target.system_wide,
 			"system-wide collection from all CPUs"),
 		OPT_UINTEGER('d', "display", &kvm->display_time,
@@ -1372,6 +1373,9 @@ static int kvm_events_live(struct perf_kvm_stat *kvm,
 			usage_with_options(live_usage, live_options);
 	}
 
+	if (quiet)
+		perf_quiet_option();
+
 	kvm->duration *= NSEC_PER_USEC;   /* convert usec to nsec */
 
 	/*
@@ -1557,6 +1561,7 @@ int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
 			   "file", "file saving guest os /proc/modules"),
 		OPT_INCR('v', "verbose", &verbose,
 			    "be more verbose (show counter open errors, etc)"),
+		OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 		OPT_END()
 	};
 
@@ -1572,6 +1577,9 @@ int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (!argc)
 		usage_with_options(kvm_usage, kvm_options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (!perf_host)
 		perf_guest = 1;
 
-- 
2.11.0