From: Frank Rowand <frank.rowand@am.sony.com>
Date: Thu, 19 Nov 2009 21:54:05 +0000 (-0800)
Subject: lockstat: Add usage info to Documentation/lockstat.txt
X-Git-Tag: firefly_0821_release~9833^2~3574^2~5
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f5754bfd107b08edddaf871d676ec6fe0792d07a;p=firefly-linux-kernel-4.4.55.git

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>
---

diff --git a/Documentation/lockstat.txt b/Documentation/lockstat.txt
index 9cb9138f7a79..65f4c795015d 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