Index: head/share/dtrace/Makefile
===================================================================
--- head/share/dtrace/Makefile	(revision 288643)
+++ head/share/dtrace/Makefile	(revision 288644)
@@ -1,30 +1,31 @@
 # $FreeBSD$
 #
 # Hand installing our scripts and optionally (based on MK_CDDL) installing
 # the DTraceToolkit.
 #
 
 .include <src.opts.mk>
 
 SUBDIR= ${_toolkit}
 
 .if ${MK_CDDL} != "no"
 _toolkit=	toolkit
 .endif
 
-SCRIPTS=	disklatency \
+SCRIPTS=	blocking \
+		disklatency \
 		disklatencycmd \
 		hotopen \
 		nfsattrstats \
 		nfsclienttime \
 		siftr \
 		tcpconn \
 		tcpstate \
 		tcptrack \
 		udptrack
 
 SCRIPTSDIR= ${SHAREDIR}/dtrace
 
 NO_OBJ=
 
 .include <bsd.prog.mk>
Index: head/share/dtrace/blocking
===================================================================
--- head/share/dtrace/blocking	(nonexistent)
+++ head/share/dtrace/blocking	(revision 288644)
@@ -0,0 +1,57 @@
+#!/usr/sbin/dtrace -s
+/*-
+ * Copyright (c) 2015 Pawel Jakub Dawidek <pawel@dawidek.net>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ *
+ * This little script is for use with programs that use event loop and should
+ * sleep only when waiting for events (eg. via kevent(2)). When a program is
+ * going to sleep in the kernel, the script will show its name, PID, kernel
+ * stack trace and userland stack trace. Sleeping in kevent(2) is ignored.
+ *
+ * usage: blocking <execname>
+ */
+
+#pragma D option quiet
+
+syscall::kevent:entry
+/execname == $$1/
+{
+	self->inkevent = 1;
+}
+
+fbt::sleepq_add:entry
+/!self->inkevent && execname == $$1/
+{
+	printf("\n%s(%d) is blocking...\n", execname, pid);
+	stack();
+	ustack();
+}
+
+syscall::kevent:return
+/execname == $$1/
+{
+	self->inkevent = 0;
+}

Property changes on: head/share/dtrace/blocking
___________________________________________________________________
Added: svn:executable
## -0,0 +1 ##
+*
\ No newline at end of property
Added: svn:keywords
## -0,0 +1 ##
+FreeBSD=%H
\ No newline at end of property