1235368Sgnn#!/usr/sbin/dtrace -Zs 2235368Sgnn/* 3235368Sgnn * j_flow.d - snoop Java execution showing method flow using DTrace. 4235368Sgnn * Written for the Java hotspot DTrace provider. 5235368Sgnn * 6235368Sgnn * $Id: j_flow.d 38 2007-09-16 08:17:41Z brendan $ 7235368Sgnn * 8235368Sgnn * This traces activity from all Java processes on the system with hotspot 9235368Sgnn * provider support (1.6.0) and the flag "+ExtendedDTraceProbes". eg, 10235368Sgnn * java -XX:+ExtendedDTraceProbes classfile 11235368Sgnn * 12235368Sgnn * USAGE: j_flow.d # hit Ctrl-C to end 13235368Sgnn * 14235368Sgnn * This watches Java method entries and returns, and indents child 15235368Sgnn * method calls. 16235368Sgnn * 17235368Sgnn * FIELDS: 18235368Sgnn * C CPU-id 19235368Sgnn * TIME(us) Time since boot, us 20235368Sgnn * PID Process ID 21235368Sgnn * CLASS.METHOD Java class and method name 22235368Sgnn * 23235368Sgnn * LEGEND: 24235368Sgnn * -> method entry 25235368Sgnn * <- method return 26235368Sgnn * 27235368Sgnn * WARNING: Watch the first column carefully, it prints the CPU-id. If it 28235368Sgnn * changes, then it is very likely that the output has been shuffled. 29235368Sgnn * Changes in TID will appear to shuffle output, as we change from one thread 30235368Sgnn * depth to the next. See Docs/Notes/ALLjavaflow.txt for additional notes. 31235368Sgnn * 32235368Sgnn * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. 33235368Sgnn * 34235368Sgnn * CDDL HEADER START 35235368Sgnn * 36235368Sgnn * The contents of this file are subject to the terms of the 37235368Sgnn * Common Development and Distribution License, Version 1.0 only 38235368Sgnn * (the "License"). You may not use this file except in compliance 39235368Sgnn * with the License. 40235368Sgnn * 41235368Sgnn * You can obtain a copy of the license at Docs/cddl1.txt 42235368Sgnn * or http://www.opensolaris.org/os/licensing. 43235368Sgnn * See the License for the specific language governing permissions 44235368Sgnn * and limitations under the License. 45235368Sgnn * 46235368Sgnn * CDDL HEADER END 47235368Sgnn * 48235368Sgnn * 09-Sep-2007 Brendan Gregg Created this. 49235368Sgnn */ 50235368Sgnn 51235368Sgnn/* increasing bufsize can reduce drops */ 52235368Sgnn#pragma D option bufsize=16m 53235368Sgnn#pragma D option quiet 54235368Sgnn#pragma D option switchrate=10 55235368Sgnn 56235368Sgnnself int depth[int]; 57235368Sgnn 58235368Sgnndtrace:::BEGIN 59235368Sgnn{ 60235368Sgnn printf("%3s %6s %-16s -- %s\n", "C", "PID", "TIME(us)", "CLASS.METHOD"); 61235368Sgnn} 62235368Sgnn 63235368Sgnnhotspot*:::method-entry 64235368Sgnn{ 65235368Sgnn this->class = (char *)copyin(arg1, arg2 + 1); 66235368Sgnn this->class[arg2] = '\0'; 67235368Sgnn this->method = (char *)copyin(arg3, arg4 + 1); 68235368Sgnn this->method[arg4] = '\0'; 69235368Sgnn 70235368Sgnn printf("%3d %6d %-16d %*s-> %s.%s\n", cpu, pid, timestamp / 1000, 71235368Sgnn self->depth[arg0] * 2, "", stringof(this->class), 72235368Sgnn stringof(this->method)); 73235368Sgnn self->depth[arg0]++; 74235368Sgnn} 75235368Sgnn 76235368Sgnnhotspot*:::method-return 77235368Sgnn{ 78235368Sgnn this->class = (char *)copyin(arg1, arg2 + 1); 79235368Sgnn this->class[arg2] = '\0'; 80235368Sgnn this->method = (char *)copyin(arg3, arg4 + 1); 81235368Sgnn this->method[arg4] = '\0'; 82235368Sgnn 83235368Sgnn self->depth[arg0] -= self->depth[arg0] > 0 ? 1 : 0; 84235368Sgnn printf("%3d %6d %-16d %*s<- %s.%s\n", cpu, pid, timestamp / 1000, 85235368Sgnn self->depth[arg0] * 2, "", stringof(this->class), 86235368Sgnn stringof(this->method)); 87235368Sgnn} 88