Add a new awk script which parses informations returned by the newly

added sysctl debug.witness.graphs and returns all the graphs involving
Giant lock creating an appropriate script in DOT format which can be
plotted immediately.

Submitted by:   Michele Dallachiesa <michele dot dallachiesa at poste dot it>

1 files changed, 24 insertions, 0 deletions

diff --git a/share/examples/witness/lockgraphs.sh b/share/examples/witness/lockgraphs.sh
new file mode 100644
index 000000000000..92a7dd2a1f81
--- /dev/null
+++ b/share/examples/witness/lockgraphs.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+################################################################################
+#
+# lockgraphs.sh by Michele Dallachiesa -- 2008-05-07 -- v0.1
+#
+# $FreeBSD$
+#
+################################################################################
+
+sysctl debug.witness.graphs | awk '
+BEGIN {
+  print "digraph lockgraphs {"
+  }
+
+NR > 1 && $0 ~ /"Giant"/ {
+  gsub(","," -> ");
+  print $0 ";"
+}
+
+END { 
+  print "}"
+  }'
+
+#eof