Date: Mon, 16 Jul 2012 17:48:43 +0000 (UTC) From: "George V. Neville-Neil" <gnn@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r238535 - head/share/dtrace Message-ID: <201207161748.q6GHmhaQ066153@svn.freebsd.org>
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Author: gnn Date: Mon Jul 16 17:48:43 2012 New Revision: 238535 URL: http://svn.freebsd.org/changeset/base/238535 Log: Add a script that traces NFS attribute cache accesses. Submitted by: rwatson MFC after: 2 weeks Added: head/share/dtrace/nfsattrstats (contents, props changed) Added: head/share/dtrace/nfsattrstats ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/share/dtrace/nfsattrstats Mon Jul 16 17:48:43 2012 (r238535) @@ -0,0 +1,74 @@ +#!/bin/sh +# +# Copyright (c) 2012 Robert N. M. Watson +# 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. +# +# $FreeBSD$ +# +# This script creates a trace of NFS RPCs, NFS attribute cache +# activity, and NFS access cache activity, along with the system call +# that instigated the activity. Notice that NFS events may happen +# outside of the context of a system call, most likely due to the VM +# system paging from NFS, in which case the system call name is +# reported as "-" + +/usr/sbin/dtrace -n ' +#pragma D option quiet + +dtrace:::BEGIN +{ + printf("probe\targ0\texecutable\tsyscall\n"); +} + +syscall:::entry +{ + + self->syscallname = probefunc; +} + +syscall:::return +{ + + self->syscallname = ""; +} + +nfsclient::: +/self->syscallname != 0 && self->syscallname != ""/ +{ + + printf("%s\t%s\t%s\t%s\n", probemod, stringof(arg0), execname, + self->syscallname); +} + +nfsclient::: +/self->syscallname == 0 || self->syscallname == ""/ +{ + + printf("%s\t%s\t%s\t%s\n", probemod, stringof(arg0), execname, + self->syscallname); +} +'
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