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