[PATCH 12/23] perf kmem: Add -q/--quiet option

[Namhyung Kim]

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.

Before:

  # perf kmem stat
  Failed to open /usr/lib/libpthread-2.21.so, continuing without symbols
  Failed to open /usr/lib/libc-2.21.so, continuing without symbols
  Failed to open /lib/modules/3.18.6-1-ARCH/kernel/fs/ext4/ext4.ko.gz, continuing without symbols
  SUMMARY (SLAB allocator)
  ========================
  Total bytes requested: 172,628
  Total bytes allocated: 173,088
  Total bytes freed:     161,280
  Net total bytes allocated: 11,808
  Total bytes wasted on internal fragmentation: 460
  Internal fragmentation: 0.265761%
  Cross CPU allocations: 0/851

After:

  # perf kmem stat -q
  SUMMARY (SLAB allocator)
  ========================
  Total bytes requested: 172,628
  Total bytes allocated: 173,088
  Total bytes freed:     161,280
  Net total bytes allocated: 11,808
  Total bytes wasted on internal fragmentation: 460
  Internal fragmentation: 0.265761%
  Cross CPU allocations: 0/851

Suggested-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
---
 tools/perf/Documentation/perf-kmem.txt | 4 ++++
 tools/perf/builtin-kmem.c              | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/tools/perf/Documentation/perf-kmem.txt b/tools/perf/Documentation/perf-kmem.txt
index 479fc3261a50..0731389501d4 100644
--- a/tools/perf/Documentation/perf-kmem.txt
+++ b/tools/perf/Documentation/perf-kmem.txt
@@ -29,6 +29,10 @@ OPTIONS
 --verbose::
         Be more verbose. (show symbol address, etc)
 
+-q::
+--quiet::
+	Do not show any message.
+
 --caller::
 	Show per-callsite statistics
 
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 6da8d083e4e5..7148137c3a3d 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -1895,6 +1895,7 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_STRING('i', "input", &input_name, "file", "input file name"),
 	OPT_INCR('v', "verbose", &verbose,
 		    "be more verbose (show symbol address, etc)"),
+	OPT_BOOLEAN('q', "quiet", &quiet, "Do not show any message"),
 	OPT_CALLBACK_NOOPT(0, "caller", NULL, NULL,
 			   "show per-callsite statistics", parse_caller_opt),
 	OPT_CALLBACK_NOOPT(0, "alloc", NULL, NULL,
@@ -1932,6 +1933,9 @@ int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (!argc)
 		usage_with_options(kmem_usage, kmem_options);
 
+	if (quiet)
+		perf_quiet_option();
+
 	if (kmem_slab == 0 && kmem_page == 0) {
 		if (kmem_default == KMEM_SLAB)
 			kmem_slab = 1;
-- 
2.11.0