1#!/usr/sbin/dtrace -Zs
2/*
3 * j_objnew.d - report Java object allocation using DTrace.
4 *              Written for the Java hotspot DTrace provider.
5 *
6 * $Id: j_objnew.d 19 2007-09-12 07:47:59Z brendan $
7 *
8 * This traces activity from all Java processes on the system with hotspot
9 * provider support (1.6.0) and the flag "+ExtendedDTraceProbes". eg,
10 * java -XX:+ExtendedDTraceProbes classfile
11 *
12 * USAGE: j_objnew.d 		# hit Ctrl-C to end
13 *
14 * FIELDS:
15 *		PID		Process ID
16 *		OBJS		Number of objects created
17 *		CLASS.METHOD	Java class and method name
18 *
19 * COPYRIGHT: Copyright (c) 2007 Brendan Gregg.
20 *
21 * CDDL HEADER START
22 *
23 *  The contents of this file are subject to the terms of the
24 *  Common Development and Distribution License, Version 1.0 only
25 *  (the "License").  You may not use this file except in compliance
26 *  with the License.
27 *
28 *  You can obtain a copy of the license at Docs/cddl1.txt
29 *  or http://www.opensolaris.org/os/licensing.
30 *  See the License for the specific language governing permissions
31 *  and limitations under the License.
32 *
33 * CDDL HEADER END
34 *
35 * 09-Sep-2007	Brendan Gregg	Created this.
36 */
37
38#pragma D option quiet
39
40dtrace:::BEGIN
41{
42	printf("Tracing... Hit Ctrl-C to end.\n");
43}
44
45hotspot*:::object-alloc
46{
47	this->class = (char *)copyin(arg1, arg2 + 1);
48	this->class[arg2] = '\0';
49	@objs[pid, stringof(this->class)] = count();
50	@dist[pid, stringof(this->class)] = quantize(arg3);
51}
52
53dtrace:::END
54{
55	printf("Java object allocation byte distributions by pid and class,\n");
56	printa(@dist);
57
58	printf("Java object allocation count by pid and class,\n\n");
59	printf(" %6s %8s %s\n", "PID", "OBJS", "CLASS");
60	printa(" %6d %8@d %s\n", @objs);
61}
62