1 #!/usr/sbin/dtrace -s 2 /* 3 * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * - Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * - Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * - Neither the name of Oracle nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 21 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 22 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 */ 35 36 /* 37 * Description: 38 * dtrace -c option launches the command specified in the -c argument and 39 * starts tracing the process. Typically, you can run a D script and trace 40 * a Java application as follows: 41 * dscript.d -Zc "java HelloWorld" 42 * 43 * The -Z option is needed to permit probe descriptions that match zero 44 * probes because Hotspot probes definitions are located in libjvm.so which 45 * has not been yet loaded and thus can't be enabled until the application 46 * is started. 47 * 48 * Straightforward attempt to run D script may fail, e.g.: 49 * dscript.d -c "java HelloWorld" 50 * "probe description hotspotPID:::probename does not match any probes" 51 * 52 * This is because DTrace tries to enable probes before libjvm.so is loaded. 53 * The -Z option requires Solaris patch 118822-30 installed on your system. 54 * 55 * In case you don't have this Solaris patch use dtrace_helper.d script. 56 * This script waits until the Hotspot DTrace probes are loaded and then 57 * stops the Java process (passed as '-c' options). After the process is 58 * stopped, another D script (passed as first argument) is called to do real 59 * trace of Java process. 60 * 61 * Usage example: 62 * dtrace_helper.d -c "java ..." ../hotspot/class_loading_stat.d 63 */ 64 65 #pragma D option quiet 66 #pragma D option destructive 67 68 69 pid$target::dlopen:entry 70 { 71 self->filename = arg0; 72 } 73 74 75 pid$target::dlopen:return 76 /self->filename && basename(copyinstr(self->filename)) == "libjvm.so"/ 77 { 78 printf(" loaded %s\n", basename(copyinstr(self->filename))); 79 self->filename = 0; 80 81 stop(); 82 printf(" stopped java process with pid=%d \n", $target); 83 84 printf(" run: %s -p %d &", $1, $target); 85 system("(%s -p %d) &", $1, $target); 86 exit(0); 87 } 88
