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

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