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proc/17369/task/17389/root/usr/share/systemtap/examples/io/_[ Not.Writable ]

File://proc/17369/task/17389/root/usr/share/systemtap/examples/io/traceio.stp

#!/usr/bin/stap
# traceio.stp
# Copyright (C) 2007-2018 Red Hat, Inc., Eugene Teo <eteo@redhat.com>
# Copyright (C) 2009 Kai Meyer <kai@unixlords.com>
#   Fixed a bug that allows this to run longer
#   And added the humanreadable function
#
# 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 {
  if (returnval() > 0) {
    reads[pid(),execname()] += returnval()
    total_io[pid(),execname()] += returnval()
  }
}

probe vfs.write.return {
  if (returnval() > 0) {
    writes[pid(),execname()] += returnval()
    total_io[pid(),execname()] += returnval()
  }
}

function humanreadable(bytes) {
  if (bytes > 1024*1024*1024) {
    return sprintf("%d GiB", bytes/1024/1024/1024)
  } else if (bytes > 1024*1024) {
    return sprintf("%d MiB", bytes/1024/1024)
  } else if (bytes > 1024) {
    return sprintf("%d KiB", bytes/1024)
  } else {
    return sprintf("%d   B", bytes)
  }
}

probe timer.s(1) {
  foreach([p,e] in total_io- limit 10)
    printf("%8d %15s r: %12s w: %12s\n",
           p, e, humanreadable(reads[p,e]),
           humanreadable(writes[p,e]))
  printf("\n")
  # Note we don't zero out reads, writes and total_io,
  # so the values are cumulative since the script started.
}

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