diff options
Diffstat (limited to 'share/dtrace/hotopen')
| -rwxr-xr-x | share/dtrace/hotopen | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/share/dtrace/hotopen b/share/dtrace/hotopen new file mode 100755 index 0000000..5516379 --- /dev/null +++ b/share/dtrace/hotopen @@ -0,0 +1,61 @@ +#!/bin/sh +# +# Copyright (c) 2012 George V. Neville-Neil +# All rights reserved. +# +# This software was developed at the University of Cambridge Computer +# Laboratory with support from a grant from Google, Inc. +# +# 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; +} +' |
