#!/usr/sbin/dtrace -CZs /* * j_profile.d - sample stack traces with Java translations using DTrace. * * USAGE: j_profile.d { -p PID | -c cmd } # hit Ctrl-C to end * $Id: j_profile.d,v 1.1.1.1 2015/09/30 22:01:07 christos Exp $ * * * This samples stack traces for the process specified. This stack trace * will cross the JVM and system libraries, and insert translations for Java * stack frames where appropriate. This is best explained with an example * stack frame output, * * Func_loop.func_c()V * Func_loop.func_b()V * Func_loop.func_a()V * Func_loop.main([Ljava/lang/String;)V * StubRoutines (1) * libjvm.so`__1cJJavaCallsLcall_helper6FpnJJavaValue_pnMmethodHan * libjvm.so`__1cCosUos_exception_wrapper6FpFpnJJavaValue_pnMmetho * libjvm.so`__1cJJavaCallsEcall6FpnJJavaValue_nMmethodHandle_pnRJ * libjvm.so`__1cRjni_invoke_static6FpnHJNIEnv__pnJJavaValue_pnI_j * libjvm.so`jni_CallStaticVoidMethod+0x15d * java`JavaMain+0xd30 * libc.so.1`_thr_setup+0x52 * libc.so.1`_lwp_start * 101 * * The lines at the top are Java frames, followed by the JVM (libjvm.so). * The JVM symbols may be translated by passing the output through c++filt. * * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. * * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (the "License"). You may not use this file except in compliance * with the License. * * You can obtain a copy of the license at Docs/cddl1.txt * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * CDDL HEADER END * * 09-Sep-2007 Brendan Gregg Created this. */ #pragma D option quiet #pragma D option jstackstrsize=1024 /* * Tunables */ #define DEPTH 10 /* stack depth, frames */ #define RATE 101 /* sampling rate, Hertz */ #define TOP 25 /* number of stacks to output */ dtrace:::BEGIN { printf("Sampling %d-level stacks at %d Hertz... Hit Ctrl-C to end.\n", DEPTH, RATE); } profile-RATE /pid == $target/ { @stacks[jstack(DEPTH)] = count(); } dtrace:::END { trunc(@stacks, TOP); printf("Top %d most frequently sampled stacks,\n", TOP); printa(@stacks); }