1 #!/usr/sbin/dtrace -Zs 2 /* 3 * j_calls.d - count Java calls (method/...) using DTrace. 4 * Written for the Java hotspot DTrace provider. 5 * 6 * $Id: j_calls.d,v 1.1.1.1 2015/09/30 22:01:09 christos Exp $ 7 * 8 * This traces activity from all Java processes on the system with hotspot 9 * provider support (1.6.0). Method calls and object allocation are only 10 * visible when using the flag "+ExtendedDTraceProbes". eg, 11 * java -XX:+ExtendedDTraceProbes classfile 12 * 13 * USAGE: j_calls.d # hit Ctrl-C to end 14 * 15 * FIELDS: 16 * PID Process ID 17 * TYPE Type of call (see below) 18 * NAME Name of call 19 * COUNT Number of calls during sample 20 * 21 * TYPEs: 22 * cload class load 23 * method method call 24 * mcompile method compile 25 * mload compiled method load 26 * oalloc object alloc 27 * thread thread start 28 * 29 * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. 30 * 31 * CDDL HEADER START 32 * 33 * The contents of this file are subject to the terms of the 34 * Common Development and Distribution License, Version 1.0 only 35 * (the "License"). You may not use this file except in compliance 36 * with the License. 37 * 38 * You can obtain a copy of the license at Docs/cddl1.txt 39 * or http://www.opensolaris.org/os/licensing. 40 * See the License for the specific language governing permissions 41 * and limitations under the License. 42 * 43 * CDDL HEADER END 44 * 45 * 09-Sep-2007 Brendan Gregg Created this. 46 */ 47 48 #pragma D option quiet 49 50 dtrace:::BEGIN 51 { 52 printf("Tracing... Hit Ctrl-C to end.\n"); 53 } 54 55 hotspot*:::method-entry 56 { 57 this->class = (char *)copyin(arg1, arg2 + 1); 58 this->class[arg2] = '\0'; 59 this->method = (char *)copyin(arg3, arg4 + 1); 60 this->method[arg4] = '\0'; 61 this->name = strjoin(strjoin(stringof(this->class), "."), 62 stringof(this->method)); 63 @calls[pid, "method", this->name] = count(); 64 } 65 66 hotspot*:::object-alloc 67 { 68 this->class = (char *)copyin(arg1, arg2 + 1); 69 this->class[arg2] = '\0'; 70 @calls[pid, "oalloc", stringof(this->class)] = count(); 71 } 72 73 hotspot*:::class-loaded 74 { 75 this->class = (char *)copyin(arg0, arg1 + 1); 76 this->class[arg1] = '\0'; 77 @calls[pid, "cload", stringof(this->class)] = count(); 78 } 79 80 hotspot*:::thread-start 81 { 82 this->thread = (char *)copyin(arg0, arg1 + 1); 83 this->thread[arg1] = '\0'; 84 @calls[pid, "thread", stringof(this->thread)] = count(); 85 } 86 87 hotspot*:::method-compile-begin 88 { 89 this->class = (char *)copyin(arg0, arg1 + 1); 90 this->class[arg1] = '\0'; 91 this->method = (char *)copyin(arg2, arg3 + 1); 92 this->method[arg3] = '\0'; 93 this->name = strjoin(strjoin(stringof(this->class), "."), 94 stringof(this->method)); 95 @calls[pid, "mcompile", this->name] = count(); 96 } 97 98 hotspot*:::compiled-method-load 99 { 100 this->class = (char *)copyin(arg0, arg1 + 1); 101 this->class[arg1] = '\0'; 102 this->method = (char *)copyin(arg2, arg3 + 1); 103 this->method[arg3] = '\0'; 104 this->name = strjoin(strjoin(stringof(this->class), "."), 105 stringof(this->method)); 106 @calls[pid, "mload", this->name] = count(); 107 } 108 109 dtrace:::END 110 { 111 printf(" %6s %-8s %-52s %8s\n", "PID", "TYPE", "NAME", "COUNT"); 112 printa(" %6d %-8s %-52s %@8d\n", @calls); 113 } 114