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authorDaniel Wagner <daniel.wagner@bmw-carit.de>2015-01-13 15:59:30 +0100
committerJonathan Corbet <corbet@lwn.net>2015-01-28 15:13:10 -0700
commit7b7e1b7b7f6f16862ba5bfe79f024139e61b6623 (patch)
treedbff992ffd9e52b69550d5885b8122415cabc098 /Documentation/locking
parente72a65292126fc87f53b6245ce51ff4d49dc914a (diff)
lockstat: Add documentation on contention and contenting points
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>
Diffstat (limited to 'Documentation/locking')
-rw-r--r--Documentation/locking/lockstat.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/locking/lockstat.txt b/Documentation/locking/lockstat.txt
index 7428773a1e69..568bbbacee91 100644
--- a/Documentation/locking/lockstat.txt
+++ b/Documentation/locking/lockstat.txt
@@ -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
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
short separator. The contention points don't match the column descriptors,
they have two: contentions and [<IP>] symbol. The second set of contention