#!/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 measures all time spent waiting on RPC replies for each
# system call, and then generates a histogram of those times sorted by
# system call name.
#
# Currently only supports NFSv3
#
# Usage: nfsclienttime
#
# Press Ctrl-C to exit and display statistics.
#

/usr/sbin/dtrace -n '
#pragma D option quiet

dtrace:::BEGIN
{
	printf("Collecting data...press Ctrl-C to exit.\n");
}

syscall:::entry
{

        self->count = 0;
}

nfsclient:nfs3::start
{

        self->timestamp = timestamp;
}

nfsclient:nfs3::done
{

        self->count += (timestamp - self->timestamp);
}

syscall:::return
/self->count != 0/  {

        @syscalls[probefunc] = quantize(self->count);
}
'