xref: /freebsd-10.1-release/share/dtrace/hotopen

#!/bin/sh
#
# Copyright (c) 2012 George V. Neville-Neil
# 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 AUTHOR 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 AUTHOR 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.
#
# $FreeBSD$
#
# The hotopen D script periodically outputs  table of which UIDs
# are opening files.   This is a very quick way to find out if
# a paritcular user is thrashing a system with rapid calls to
# open/close.
#
# Usage: hotopen
#

/usr/sbin/dtrace -n '
#pragma D option quiet
BEGIN
{
	printf("Files opened per UID in the last second.\n");
}

syscall::open:entry
{
	@files[uid] = count();
	output = 1;
}

tick-1sec
/output != 0/
{
	printf("%-20Y \n", walltimestamp);
	printa("uid %d\tcount %@d\n", @files, @files);
	trunc(@files);
	output = 0;
}
'