[tip:core/urgent] lockstat: Add usage info to Documentation/lockstat.txt

[tip-bot for Frank Rowand <frank.rowand@am.sony.com>]

Commit-ID:  f5754bfd107b08edddaf871d676ec6fe0792d07a
Gitweb:     http://git.kernel.org/tip/f5754bfd107b08edddaf871d676ec6fe0792d07a
Author:     Frank Rowand <frank.rowand@am.sony.com>
AuthorDate: Thu, 19 Nov 2009 13:54:05 -0800
Committer:  Ingo Molnar <mingo@elte.hu>
CommitDate: Sun, 6 Dec 2009 13:20:02 +0100

lockstat: Add usage info to Documentation/lockstat.txt

Add usage info to Documentation/lockstat.txt

Signed-off-by: Frank Rowand <frank.rowand@am.sony.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <4B05BE7D.30500@am.sony.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 Documentation/lockstat.txt |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/Documentation/lockstat.txt b/Documentation/lockstat.txt
index 9cb9138..65f4c79 100644
--- a/Documentation/lockstat.txt
+++ b/Documentation/lockstat.txt
@@ -62,8 +62,20 @@ applicable).
 It also tracks 4 contention points per class. A contention point is a call site
 that had to wait on lock acquisition.
 
+ - CONFIGURATION
+
+Lock statistics are enabled via CONFIG_LOCK_STATS.
+
  - USAGE
 
+Enable collection of statistics:
+
+# echo 1 >/proc/sys/kernel/lock_stat
+
+Disable collection of statistics:
+
+# echo 0 >/proc/sys/kernel/lock_stat
+
 Look at the current lock statistics:
 
 ( line numbers not part of actual output, done for clarity in the explanation