From f5754bfd107b08edddaf871d676ec6fe0792d07a Mon Sep 17 00:00:00 2001 From: Frank Rowand Date: Thu, 19 Nov 2009 13:54:05 -0800 Subject: [PATCH] lockstat: Add usage info to Documentation/lockstat.txt Add usage info to Documentation/lockstat.txt Signed-off-by: Frank Rowand Signed-off-by: Peter Zijlstra LKML-Reference: <4B05BE7D.30500@am.sony.com> Signed-off-by: Ingo Molnar --- Documentation/lockstat.txt | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/Documentation/lockstat.txt b/Documentation/lockstat.txt index 9cb9138f7a7..65f4c795015 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