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#!/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 kernel.function("vfs_read").return {
reads[execname()] += $return
}
probe kernel.function("vfs_write").return {
writes[execname()] += $return
}
probe timer.s(1) {
foreach (p in reads)
total_io[p] += reads[p]
foreach (p in writes)
total_io[p] += writes[p]
foreach(p in total_io- limit 10)
printf("%15s r: %8d KiB w: %8d KiB\n",
p, reads[p]/1024,
writes[p]/1024)
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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