[PATCH] perf lock: Fix and add misc documentally things

[Hitoshi Mitake]

I've forgot to add 'perf lock' line to command-list.txt,
so users of perf could not find perf lock when they type 'perf'.

Fixing command-list.txt requires document
(tools/perf/Documentation/perf-lock.txt).
But perf lock is too under construction tool to write document,
so this is something like pseudo document now.

And I wrote description of perf lock at help section of
CONFIG_LOCK_STAT, this will navigate users of lock trace events.

Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Signed-off-by: Hitoshi Mitake <mitake@xxxxxxxxxxxxxxxxxxxxx>
---
 lib/Kconfig.debug                      |    6 ++++++
 tools/perf/Documentation/perf-lock.txt |   29 +++++++++++++++++++++++++++++
 tools/perf/command-list.txt            |    1 +
 3 files changed, 36 insertions(+), 0 deletions(-)
 create mode 100644 tools/perf/Documentation/perf-lock.txt

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 25c3ed5..994d58c 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -520,6 +520,12 @@ config LOCK_STAT
 
 	 For more details, see Documentation/lockstat.txt
 
+	 You can analyze lock events with "perf lock", subcommand of perf.
+	 If you want to use "perf lock", you need to turn on CONFIG_FTRACE.
+
+	 CONFIG_LOCK_STAT defines events of contended and acquired.
+ 	 (CONFIG_LOCKDEP defines events of acquire and release.)
+
 config DEBUG_LOCKDEP
 	bool "Lock dependency engine debugging"
 	depends on DEBUG_KERNEL && LOCKDEP
diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt
new file mode 100644
index 0000000..77e6c74
--- /dev/null
+++ b/tools/perf/Documentation/perf-lock.txt
@@ -0,0 +1,29 @@
+perf-lock(1)
+============
+
+NAME
+----
+perf-lock - Analyze lock events
+
+SYNOPSIS
+--------
+[verse]
+'perf lock' {record|report|trace}
+
+DESCRIPTION
+-----------
+You can analyze various lock behaviour
+and statistics with this 'perf lock' command.
+
+  'perf lock record <command>' records events of lock
+  between start and end <command>. And this command
+  produces the file "perf.data" which containts tracing
+  result of lock events.
+
+  'perf lock trace' shows raw events of lock.
+
+  'perf lock report' reoprts statistical data.
+
+SEE ALSO
+--------
+linkperf:perf[1]
diff --git a/tools/perf/command-list.txt b/tools/perf/command-list.txt
index 9afcff2..db6ee94 100644
--- a/tools/perf/command-list.txt
+++ b/tools/perf/command-list.txt
@@ -18,3 +18,4 @@ perf-top			mainporcelain common
 perf-trace			mainporcelain common
 perf-probe			mainporcelain common
 perf-kmem			mainporcelain common
+perf-lock			mainporcelain common
-- 
1.6.5.2

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