diff options
| author | Frank Rowand <frank.rowand@am.sony.com> | 2009-11-19 16:54:05 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-06 07:20:02 -0500 |
| 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 9cb9138f7a79..65f4c795015d 100644 --- a/Documentation/lockstat.txt +++ b/Documentation/lockstat.txt | |||
| @@ -62,8 +62,20 @@ applicable). | |||
| 62 | It also tracks 4 contention points per class. A contention point is a call site | 62 | It also tracks 4 contention points per class. A contention point is a call site |
| 63 | that had to wait on lock acquisition. | 63 | that had to wait on lock acquisition. |
| 64 | 64 | ||
| 65 | - CONFIGURATION | ||
| 66 | |||
| 67 | Lock statistics are enabled via CONFIG_LOCK_STATS. | ||
| 68 | |||
| 65 | - USAGE | 69 | - USAGE |
| 66 | 70 | ||
| 71 | Enable collection of statistics: | ||
| 72 | |||
| 73 | # echo 1 >/proc/sys/kernel/lock_stat | ||
| 74 | |||
| 75 | Disable collection of statistics: | ||
| 76 | |||
| 77 | # echo 0 >/proc/sys/kernel/lock_stat | ||
| 78 | |||
| 67 | Look at the current lock statistics: | 79 | Look at the current lock statistics: |
| 68 | 80 | ||
| 69 | ( line numbers not part of actual output, done for clarity in the explanation | 81 | ( line numbers not part of actual output, done for clarity in the explanation |