1#!/usr/sbin/dtrace -s 2/*- 3 * Copyright (c) 2015 Pawel Jakub Dawidek <pawel@dawidek.net> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 * 29 * This little script is for use with programs that use event loop and should 30 * sleep only when waiting for events (eg. via kevent(2)). When a program is 31 * going to sleep in the kernel, the script will show its name, PID, kernel 32 * stack trace and userland stack trace. Sleeping in kevent(2) is ignored. 33 * 34 * usage: blocking <execname> 35 */ 36 37#pragma D option quiet 38 39syscall::kevent:entry 40/execname == $$1/ 41{ 42 self->inkevent = 1; 43} 44 45fbt::sleepq_add:entry 46/!self->inkevent && execname == $$1/ 47{ 48 printf("\n%s(%d) is blocking...\n", execname, pid); 49 stack(); 50 ustack(); 51} 52 53syscall::kevent:return 54/execname == $$1/ 55{ 56 self->inkevent = 0; 57} 58