#! /usr/bin/env stap
# traceio.stp
# Copyright (C) 2007 Red Hat, Inc., Eugene Teo <eteo@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#

global reads, writes, total_io

probe vfs.read.return {
  reads[pid(),execname()] += $return
  total_io[pid(),execname()] += $return
}

probe vfs.write.return {
  writes[pid(),execname()] += $return
  total_io[pid(),execname()] += $return
}

probe timer.s(1) {
  foreach([p,e] in total_io- limit 10)
    printf("%8d %15s r: %8d MiB w: %8d MiB\n",
           p, e, reads[p,e]/1024/1024,
           writes[p,e]/1024/1024)
  printf("\n")
  # Note we don't zero out reads, writes and total_io,
  # so the values are cumulative since the script started.
}