From 29614b3788d02015457cdfd012c197dcd391f1c5 Mon Sep 17 00:00:00 2001
From: Attilio Rao <attilio@FreeBSD.org>
Date: Wed, 7 May 2008 21:50:17 +0000
Subject: [PATCH] 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>
---
 share/examples/witness/lockgraphs.sh | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 share/examples/witness/lockgraphs.sh

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