58 lines
2.0 KiB
Plaintext
58 lines
2.0 KiB
Plaintext
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#!/usr/sbin/dtrace -s
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/*-
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* Copyright (c) 2015 Pawel Jakub Dawidek <pawel@dawidek.net>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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* This little script is for use with programs that use event loop and should
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* sleep only when waiting for events (eg. via kevent(2)). When a program is
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* going to sleep in the kernel, the script will show its name, PID, kernel
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* stack trace and userland stack trace. Sleeping in kevent(2) is ignored.
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*
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* usage: blocking <execname>
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*/
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#pragma D option quiet
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syscall::kevent:entry
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/execname == $$1/
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{
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self->inkevent = 1;
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}
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fbt::sleepq_add:entry
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/!self->inkevent && execname == $$1/
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{
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printf("\n%s(%d) is blocking...\n", execname, pid);
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stack();
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ustack();
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}
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syscall::kevent:return
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/execname == $$1/
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{
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self->inkevent = 0;
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}
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