/usr/share/systemtap/examples/io
Edit: /usr/share/systemtap/examples/io/traceio.stp (1384B)
#!/usr/bin/stap
# traceio.stp
# Copyright (C) 2007-2018 Red Hat, Inc., Eugene Teo
# Copyright (C) 2009 Kai Meyer
# 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.
}