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lockstat: Add documentation on contention and contenting points

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Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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Daniel Wagner 2015-01-13 15:59:30 +01:00 committed by Jonathan Corbet
parent e72a652921
commit 7b7e1b7b7f
1 changed files with 5 additions and 0 deletions
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Documentation/locking/lockstat.txt
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@ -121,6 +121,11 @@ show the header with column descriptions. Lines 05-18 and 20-31 show the actual
statistics. These statistics come in two parts; the actual stats separated by a statistics. These statistics come in two parts; the actual stats separated by a
short separator (line 08, 13) from the contention points. short separator (line 08, 13) from the contention points.
Lines 09-12 show the first 4 recorded contention points (the code
which tries to get the lock) and lines 14-17 show the first 4 recorded
contended points (the lock holder). It is possible that the max
con-bounces point is missing in the statistics.
The first lock (05-18) is a read/write lock, and shows two lines above the The first lock (05-18) is a read/write lock, and shows two lines above the
short separator. The contention points don't match the column descriptors, short separator. The contention points don't match the column descriptors,
they have two: contentions and [<IP>] symbol. The second set of contention they have two: contentions and [<IP>] symbol. The second set of contention