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lockstat: Add usage info to Documentation/lockstat.txt

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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>
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Frank Rowand 2009-11-19 13:54:05 -08:00 committed by Ingo Molnar
parent 109d71c6dd
commit f5754bfd10
1 changed files with 12 additions and 0 deletions
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Documentation/lockstat.txt
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@ -62,8 +62,20 @@ applicable).
It also tracks 4 contention points per class. A contention point is a call site It also tracks 4 contention points per class. A contention point is a call site
that had to wait on lock acquisition. that had to wait on lock acquisition.
- CONFIGURATION
Lock statistics are enabled via CONFIG_LOCK_STATS.
- USAGE - 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: Look at the current lock statistics:
( line numbers not part of actual output, done for clarity in the explanation ( line numbers not part of actual output, done for clarity in the explanation