#!/usr/bin/sh
#
# dvmstat - vmstat by PID/name/command.
#           Written using DTrace (Solaris 10 3/05).
#
# This program provides vmstat like data for one particular PID, a 
# process name, or when running a command. It prints statistics
# every second.
#
# $Id: dvmstat,v 1.1.1.1 2015/09/30 22:01:07 christos Exp $
#
# USAGE:	dvmstat { -p PID | -n name | command }
#  eg,
#		dvmstat -p 1871       # examine PID 1871
#		dvmstat -n tar        # examine processes called "tar"
#		dvmstat df -h         # run and examine "df -h"
#
# FIELDS: 
#		re	page reclaims		Kbytes
#		maj	major faults		Kbytes
#		mf	minor faults		Kbytes
#		fr	page frees		Kbytes
#		epi	executable page ins	Kbytes
#		epo	executable page out	Kbytes
#		api	anonymous page ins	Kbytes
#		apo	anonymous page outs	Kbytes
#		fpi	filesystem page ins	Kbytes
#		fpo	filesystem page outs	Kbytes
#		sy	system calls		number
#
# SEE ALSO:	vmstat(1M)
#
# NOTES:
#
# When using dvmstat to run a command - if the command takes some time
# to execute, dvmstat will print output every second. If the command runs
# in less than a second, then the only one line of output will be printed.
#
# COPYRIGHT: Copyright (c) 2005 Brendan Gregg.
#
# CDDL HEADER START
#
#  The contents of this file are subject to the terms of the
#  Common Development and Distribution License, Version 1.0 only
#  (the "License").  You may not use this file except in compliance
#  with the License.
#
#  You can obtain a copy of the license at Docs/cddl1.txt
#  or http://www.opensolaris.org/os/licensing.
#  See the License for the specific language governing permissions
#  and limitations under the License.
#
# CDDL HEADER END
#
# Author: Brendan Gregg  [Sydney, Australia]
#
# 12-Jun-2005	Brendan Gregg	Created this.
# 08-Jan-2006	   "      "	Last update.
# 

##############################
# --- Process Arguments ---
#

### Default variables
opt_pid=0; opt_name=0; pid=0; pname="."; opt_command=0; command=""

### Process options
while getopts hn:p: name
do
        case $name in
        p)      opt_pid=1; pid=$OPTARG ;;
        n)      opt_name=1; pname=$OPTARG ;;
        h|?)    cat <<-END >&2
		USAGE: dvmstat [-h] { -p PID | -n name | command }
		           -p PID          # examine this PID
		           -n name         # examine this process name
		  eg,
		       dvmstat -p 1871     # examine PID 1871
		       dvmstat -n tar      # examine processes called "tar"
		       dvmstat df -h       # run and examine "df -h"
		END
                exit 1
        esac
done
shift `expr $OPTIND - 1`


### Option logic
if [ $opt_pid -eq 0 -a $opt_name -eq 0 ]; then
        opt_command=1
        if [ "$*" = "" ]; then
                $0 -h
                exit
        fi
        command="$*"
fi


#################################
# --- Main Program, DTrace ---
#
dtrace='
 #pragma D option quiet

 /*
  * Command line arguments
  */
 inline int OPT_pid      = '$opt_pid';
 inline int OPT_name     = '$opt_name';
 inline int OPT_command  = '$opt_command';
 inline int PID          = '$pid';
 inline string NAME      = "'$pname'";
 inline string COMMAND   = "'$command'";
 inline int SCREEN       = 21;

 /*
  * Initialise variables
  */
 dtrace:::BEGIN
 {
	epi = 0; epo = 0; api = 0; apo = 0; fpi = 0; fpo = 0;
	re = 0; mf = 0; maj = 0; fr = 0; sy = 0;
	lines = SCREEN + 1;
	header = 0;
 }

 /*
  * Print header
  */
 dtrace:::BEGIN,
 dtrace:::END,
 profile:::tick-1sec
 /(OPT_command && probename == "END") || 
  (!(OPT_command && probename == "BEGIN") && lines++ > SCREEN)/
 {
	printf("%6s %5s %5s %4s %4s %4s %4s %4s %4s %4s %6s\n",
	    "re", "maj", "mf", "fr", "epi", "epo", "api", "apo", 
	    "fpi", "fpo", "sy");
	lines = 0;
 }

 /*
  * Probe events
  *
  * this intentionally does not use an associative array for storing data,
  * for reasons of performance.
  */

 vminfo:::execpgin
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { epi += arg0; }

 vminfo:::execpgout
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { epo += arg0; }

 vminfo:::anonpgin
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { api += arg0; }

 vminfo:::anonpgout
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { apo += arg0; }

 vminfo:::fspgin
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { fpi += arg0; }

 vminfo:::fspgout
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { fpo += arg0; }

 vminfo:::pgrec
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { re += arg0; }

 vminfo:::as_fault
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { mf += arg0; }

 vminfo:::maj_fault
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { maj += arg0; }

 vminfo:::dfree
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { fr += arg0; }

 syscall:::entry
 /(OPT_pid && pid == PID) ||
  (OPT_name && execname == NAME) ||
  (OPT_command && pid == $target)/
 { sy++; }

 /* 
  * Print output line
  */
 profile:::tick-1sec,
 dtrace:::END
 {
	/* convert to Kbytes */
	re  *= `_pagesize / 1024;
	maj *= `_pagesize / 1024;
	mf  *= `_pagesize / 1024;
	fr  *= `_pagesize / 1024;
	epi *= `_pagesize / 1024;
	epo *= `_pagesize / 1024;
	api *= `_pagesize / 1024;
	apo *= `_pagesize / 1024;
	fpi *= `_pagesize / 1024;
	fpo *= `_pagesize / 1024;

	/* print line */
	printf("%6d %5d %5d %4d %4d %4d %4d %4d %4d %4d %6d\n",
	    re, maj, mf, fr, epi, epo, api, apo, fpi, fpo, sy);

	/* clear counters */
	epi = 0; epo = 0; api = 0; apo = 0; fpi = 0; fpo = 0;
	re = 0; mf = 0; maj = 0; fr = 0; sy = 0;
 }
'

### Run DTrace
if [ $opt_command -eq 1 ]; then
        /usr/sbin/dtrace -n "$dtrace" -x evaltime=exec -c "$command" >&2
else
        /usr/sbin/dtrace -n "$dtrace" >&2
fi