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| author | Frank Rowand <frank.rowand@am.sony.com> | 2009-11-19 13:54:05 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-06 13:20:02 +0100 |
| commit | f5754bfd107b08edddaf871d676ec6fe0792d07a (patch) | |
| tree | de98963fe232dd2d8578710b8db31e2d72d28f3c /Documentation/lockstat.txt | |
| parent | 109d71c6dd52ec08878c2c67eb4c0bd67fcbc80b (diff) | |
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>
Diffstat (limited to 'Documentation/lockstat.txt')
| -rw-r--r-- | Documentation/lockstat.txt | 12 |
1 files changed, 12 insertions, 0 deletions
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 |