linux-kernel - [PATCH 7/7] perf list: place the guiding text in its right position

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Date:	Fri, 13 Feb 2015 21:11:55 +0800
From:	Yunlong Song <yunlong.song@...wei.com>
To:	<a.p.zijlstra@...llo.nl>, <paulus@...ba.org>, <mingo@...hat.com>,
	<acme@...nel.org>
CC:	<linux-kernel@...r.kernel.org>, <wangnan0@...wei.com>
Subject: [PATCH 7/7] perf list: place the guiding text in its right position

The guiding text 'List of pre-defined events (to be used in -e):' is
placed in an improper function, which causes an abnormal output, e.g.
'perf list hw' shows no guiding text at all, and 'perf list hw
L1-dcache*' shows the guiding text incorrectly in the middle of the
output.

Example
Before this patch:
$perf list hw L1-dcache*

  branch-instructions OR branches                    [Hardware event]
  branch-misses                                      [Hardware event]
  bus-cycles                                         [Hardware event]
  cache-misses                                       [Hardware event]
  cache-references                                   [Hardware event]
  cpu-cycles OR cycles                               [Hardware event]
  instructions                                       [Hardware event]
  stalled-cycles-backend OR idle-cycles-backend      [Hardware event]
  stalled-cycles-frontend OR idle-cycles-frontend    [Hardware event]

List of pre-defined events (to be used in -e):              <-- incorrect position
  L1-dcache-load-misses                              [Hardware cache event]
  L1-dcache-loads                                    [Hardware cache event]
  L1-dcache-prefetch-misses                          [Hardware cache event]
  L1-dcache-prefetches                               [Hardware cache event]
  L1-dcache-store-misses                             [Hardware cache event]
  L1-dcache-stores                                   [Hardware cache event]

After this patch:
$perf list hw L1-dcache*

List of pre-defined events (to be used in -e):              <-- correct position

  branch-instructions OR branches                    [Hardware event]
  branch-misses                                      [Hardware event]
  bus-cycles                                         [Hardware event]
  cache-misses                                       [Hardware event]
  cache-references                                   [Hardware event]
  cpu-cycles OR cycles                               [Hardware event]
  instructions                                       [Hardware event]
  stalled-cycles-backend OR idle-cycles-backend      [Hardware event]
  stalled-cycles-frontend OR idle-cycles-frontend    [Hardware event]

  L1-dcache-load-misses                              [Hardware cache event]
  L1-dcache-loads                                    [Hardware cache event]
  L1-dcache-prefetch-misses                          [Hardware cache event]
  L1-dcache-prefetches                               [Hardware cache event]
  L1-dcache-store-misses                             [Hardware cache event]
  L1-dcache-stores                                   [Hardware cache event]

Signed-off-by: Yunlong Song <yunlong.song@...wei.com>
---
 tools/perf/builtin-list.c      | 3 +++
 tools/perf/util/parse-events.c | 5 -----
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-list.c b/tools/perf/builtin-list.c
index b81a62c..af5bd05 100644
--- a/tools/perf/builtin-list.c
+++ b/tools/perf/builtin-list.c
@@ -36,6 +36,9 @@ int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused)
 
 	setup_pager();
 
+	if (!raw_dump)
+		printf("\nList of pre-defined events (to be used in -e):\n\n");
+
 	if (argc == 0) {
 		print_events(NULL, raw_dump);
 		return 0;
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index cf35b0a..df1994c 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1429,11 +1429,6 @@ out_enomem:
  */
 void print_events(const char *event_glob, bool name_only)
 {
-	if (!name_only) {
-		printf("\n");
-		printf("List of pre-defined events (to be used in -e):\n");
-	}
-
 	print_symbol_events(event_glob, PERF_TYPE_HARDWARE,
 			    event_symbols_hw, PERF_COUNT_HW_MAX, name_only);
 
-- 
1.8.5.5

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