1N/A#!/usr/sbin/dtrace -Zs
1N/A/*
1N/A * j_flow.d - snoop Java execution showing method flow using DTrace.
1N/A * Written for the Java hotspot DTrace provider.
1N/A *
1N/A * $Id: j_flow.d 38 2007-09-16 08:17:41Z brendan $
1N/A *
1N/A * This traces activity from all Java processes on the system with hotspot
1N/A * provider support (1.6.0) and the flag "+ExtendedDTraceProbes". eg,
1N/A * java -XX:+ExtendedDTraceProbes classfile
1N/A *
1N/A * USAGE: j_flow.d # hit Ctrl-C to end
1N/A *
1N/A * This watches Java method entries and returns, and indents child
1N/A * method calls.
1N/A *
1N/A * FIELDS:
1N/A * C CPU-id
1N/A * TIME(us) Time since boot, us
1N/A * PID Process ID
1N/A * CLASS.METHOD Java class and method name
1N/A *
1N/A * LEGEND:
1N/A * -> method entry
1N/A * <- method return
1N/A *
1N/A * WARNING: Watch the first column carefully, it prints the CPU-id. If it
1N/A * changes, then it is very likely that the output has been shuffled.
1N/A * Changes in TID will appear to shuffle output, as we change from one thread
1N/A * depth to the next. See Docs/Notes/ALLjavaflow.txt for additional notes.
1N/A *
1N/A * COPYRIGHT: Copyright (c) 2007 Brendan Gregg.
1N/A *
1N/A * CDDL HEADER START
1N/A *
1N/A * The contents of this file are subject to the terms of the
1N/A * Common Development and Distribution License, Version 1.0 only
1N/A * (the "License"). You may not use this file except in compliance
1N/A * with the License.
1N/A *
1N/A * You can obtain a copy of the license at Docs/cddl1.txt
1N/A * or http://www.opensolaris.org/os/licensing.
1N/A * See the License for the specific language governing permissions
1N/A * and limitations under the License.
1N/A *
1N/A * CDDL HEADER END
1N/A *
1N/A * 09-Sep-2007 Brendan Gregg Created this.
1N/A */
1N/A
1N/A/* increasing bufsize can reduce drops */
1N/A#pragma D option bufsize=16m
1N/A#pragma D option quiet
1N/A#pragma D option switchrate=10
1N/A
1N/Aself int depth[int];
1N/A
1N/Adtrace:::BEGIN
1N/A{
1N/A printf("%3s %6s %-16s -- %s\n", "C", "PID", "TIME(us)", "CLASS.METHOD");
1N/A}
1N/A
1N/Ahotspot*:::method-entry
1N/A{
1N/A this->class = (char *)copyin(arg1, arg2 + 1);
1N/A this->class[arg2] = '\0';
1N/A this->method = (char *)copyin(arg3, arg4 + 1);
1N/A this->method[arg4] = '\0';
1N/A
1N/A printf("%3d %6d %-16d %*s-> %s.%s\n", cpu, pid, timestamp / 1000,
1N/A self->depth[arg0] * 2, "", stringof(this->class),
1N/A stringof(this->method));
1N/A self->depth[arg0]++;
1N/A}
1N/A
1N/Ahotspot*:::method-return
1N/A{
1N/A this->class = (char *)copyin(arg1, arg2 + 1);
1N/A this->class[arg2] = '\0';
1N/A this->method = (char *)copyin(arg3, arg4 + 1);
1N/A this->method[arg4] = '\0';
1N/A
1N/A self->depth[arg0] -= self->depth[arg0] > 0 ? 1 : 0;
1N/A printf("%3d %6d %-16d %*s<- %s.%s\n", cpu, pid, timestamp / 1000,
1N/A self->depth[arg0] * 2, "", stringof(this->class),
1N/A stringof(this->method));
1N/A}