1235368Sgnn#!/usr/sbin/dtrace -Zs 2235368Sgnn/* 3235368Sgnn * j_flowtime.d - snoop Java execution with method flow and delta times. 4235368Sgnn * Written for the Java hotspot DTrace provider. 5235368Sgnn * 6235368Sgnn * $Id: j_flowtime.d 41 2007-09-17 02:20:10Z 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_flowtime.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 * PID Process ID 20235368Sgnn * TID Thread ID 21235368Sgnn * TIME(us) Time since boot (us) 22235368Sgnn * DELTA(us) Elapsed time from previous line to this line 23235368Sgnn * CLASS.METHOD Java class and method name 24235368Sgnn * 25235368Sgnn * LEGEND: 26235368Sgnn * -> method entry 27235368Sgnn * <- method return 28235368Sgnn * 29235368Sgnn * WARNING: Watch the first column carefully, it prints the CPU-id. If it 30235368Sgnn * changes, then it is very likely that the output has been shuffled. 31235368Sgnn * Changes in TID will appear to shuffle output, as we change from one thread 32235368Sgnn * depth to the next. See Docs/Notes/ALLjavaflow.txt for additional notes. 33235368Sgnn * 34235368Sgnn * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. 35235368Sgnn * 36235368Sgnn * CDDL HEADER START 37235368Sgnn * 38235368Sgnn * The contents of this file are subject to the terms of the 39235368Sgnn * Common Development and Distribution License, Version 1.0 only 40235368Sgnn * (the "License"). You may not use this file except in compliance 41235368Sgnn * with the License. 42235368Sgnn * 43235368Sgnn * You can obtain a copy of the license at Docs/cddl1.txt 44235368Sgnn * or http://www.opensolaris.org/os/licensing. 45235368Sgnn * See the License for the specific language governing permissions 46235368Sgnn * and limitations under the License. 47235368Sgnn * 48235368Sgnn * CDDL HEADER END 49235368Sgnn * 50235368Sgnn * 09-Sep-2007 Brendan Gregg Created this. 51235368Sgnn */ 52235368Sgnn 53235368Sgnn/* increasing bufsize can reduce drops */ 54235368Sgnn#pragma D option bufsize=16m 55235368Sgnn#pragma D option quiet 56235368Sgnn#pragma D option switchrate=10 57235368Sgnn 58235368Sgnnself int depth[int]; 59235368Sgnn 60235368Sgnndtrace:::BEGIN 61235368Sgnn{ 62235368Sgnn printf("%3s %6s/%-5s %-16s %9s -- %s\n", "C", "PID", "TID", "TIME(us)", 63235368Sgnn "DELTA(us)", "CLASS.METHOD"); 64235368Sgnn} 65235368Sgnn 66235368Sgnnhotspot*:::method-entry, 67235368Sgnnhotspot*:::method-return 68235368Sgnn/self->last == 0/ 69235368Sgnn{ 70235368Sgnn self->last = timestamp; 71235368Sgnn} 72235368Sgnn 73235368Sgnnhotspot*:::method-entry 74235368Sgnn{ 75235368Sgnn this->delta = (timestamp - self->last) / 1000; 76235368Sgnn this->class = (char *)copyin(arg1, arg2 + 1); 77235368Sgnn this->class[arg2] = '\0'; 78235368Sgnn this->method = (char *)copyin(arg3, arg4 + 1); 79235368Sgnn this->method[arg4] = '\0'; 80235368Sgnn 81235368Sgnn printf("%3d %6d/%-5d %-16d %9d %*s-> %s.%s\n", cpu, pid, tid, 82235368Sgnn timestamp / 1000, this->delta, self->depth[arg0] * 2, "", 83235368Sgnn stringof(this->class), stringof(this->method)); 84235368Sgnn self->depth[arg0]++; 85235368Sgnn self->last = timestamp; 86235368Sgnn} 87235368Sgnn 88235368Sgnnhotspot*:::method-return 89235368Sgnn{ 90235368Sgnn this->delta = (timestamp - self->last) / 1000; 91235368Sgnn this->class = (char *)copyin(arg1, arg2 + 1); 92235368Sgnn this->class[arg2] = '\0'; 93235368Sgnn this->method = (char *)copyin(arg3, arg4 + 1); 94235368Sgnn this->method[arg4] = '\0'; 95235368Sgnn 96235368Sgnn self->depth[arg0] -= self->depth[arg0] > 0 ? 1 : 0; 97235368Sgnn printf("%3d %6d/%-5d %-16d %9d %*s<- %s.%s\n", cpu, pid, tid, 98235368Sgnn timestamp / 1000, this->delta, self->depth[arg0] * 2, "", 99235368Sgnn stringof(this->class), stringof(this->method)); 100235368Sgnn self->last = timestamp; 101235368Sgnn} 102