j_profile.d revision 1.1
1#!/usr/sbin/dtrace -CZs 2/* 3 * j_profile.d - sample stack traces with Java translations using DTrace. 4 * 5 * USAGE: j_profile.d { -p PID | -c cmd } # hit Ctrl-C to end 6 * $Id: j_profile.d,v 1.1 2015/09/30 22:01:09 christos Exp $ 7 * 8 * 9 * This samples stack traces for the process specified. This stack trace 10 * will cross the JVM and system libraries, and insert translations for Java 11 * stack frames where appropriate. This is best explained with an example 12 * stack frame output, 13 * 14 * Func_loop.func_c()V 15 * Func_loop.func_b()V 16 * Func_loop.func_a()V 17 * Func_loop.main([Ljava/lang/String;)V 18 * StubRoutines (1) 19 * libjvm.so`__1cJJavaCallsLcall_helper6FpnJJavaValue_pnMmethodHan 20 * libjvm.so`__1cCosUos_exception_wrapper6FpFpnJJavaValue_pnMmetho 21 * libjvm.so`__1cJJavaCallsEcall6FpnJJavaValue_nMmethodHandle_pnRJ 22 * libjvm.so`__1cRjni_invoke_static6FpnHJNIEnv__pnJJavaValue_pnI_j 23 * libjvm.so`jni_CallStaticVoidMethod+0x15d 24 * java`JavaMain+0xd30 25 * libc.so.1`_thr_setup+0x52 26 * libc.so.1`_lwp_start 27 * 101 28 * 29 * The lines at the top are Java frames, followed by the JVM (libjvm.so). 30 * The JVM symbols may be translated by passing the output through c++filt. 31 * 32 * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. 33 * 34 * CDDL HEADER START 35 * 36 * The contents of this file are subject to the terms of the 37 * Common Development and Distribution License, Version 1.0 only 38 * (the "License"). You may not use this file except in compliance 39 * with the License. 40 * 41 * You can obtain a copy of the license at Docs/cddl1.txt 42 * or http://www.opensolaris.org/os/licensing. 43 * See the License for the specific language governing permissions 44 * and limitations under the License. 45 * 46 * CDDL HEADER END 47 * 48 * 09-Sep-2007 Brendan Gregg Created this. 49 */ 50 51#pragma D option quiet 52#pragma D option jstackstrsize=1024 53 54/* 55 * Tunables 56 */ 57#define DEPTH 10 /* stack depth, frames */ 58#define RATE 101 /* sampling rate, Hertz */ 59#define TOP 25 /* number of stacks to output */ 60 61dtrace:::BEGIN 62{ 63 printf("Sampling %d-level stacks at %d Hertz... Hit Ctrl-C to end.\n", 64 DEPTH, RATE); 65} 66 67profile-RATE 68/pid == $target/ 69{ 70 @stacks[jstack(DEPTH)] = count(); 71} 72 73dtrace:::END 74{ 75 trunc(@stacks, TOP); 76 printf("Top %d most frequently sampled stacks,\n", TOP); 77 printa(@stacks); 78} 79