support lightweight java profiler

stackcollapse-ljp.awk

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+#!/usr/bin/awk -f
+#
+# stackcolllapse-ljp.awk	collapse lightweight java profile reports
+#				into single lines stacks.
+#
+# Parses a list of multiline stacks generated by:
+#
+#  https://code.google.com/p/lightweight-java-profiler
+#
+# and outputs a semicolon separated stack followed by a space and a count.
+#
+# USAGE: ./stackcollapse-ljp.pl infile > outfile
+#
+# Example input:
+#
+#  42 3  my_func_b(prog.java:455)
+#        my_func_a(prog.java:123)
+#        java.lang.Thread.run(Thread.java:744)
+#  [...]
+#
+# Example output:
+#
+#  java.lang.Thread.run;my_func_a;my_func_b 42
+#
+# The unused number is the number of frames in each stack.
+#
+# Copyright 2014 Brendan Gregg.  All rights reserved.
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at docs/cddl1.txt or
+# http://opensource.org/licenses/CDDL-1.0.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at docs/cddl1.txt.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+# 12-Jun-2014	Brendan Gregg	Created this.
+
+$1 == "Total" {
+	# We're done. Print last stack and exit.
+	print stack, count
+	exit
+}
+
+{
+	# Strip file location. Comment this out to keep.
+	#gsub(/\(.*\)/, "")
+}
+
+NF == 3 {
+	# New stack begins. Print previous buffered stack.
+	if (count)
+		print stack, count
+
+	# Begin a new stack.
+	count = $1
+	stack = $3
+}
+
+NF == 1 {
+	# Build stack.
+	stack = $1 ";" stack
+}