/usr/share/systemtap/examples/io
Edit: /usr/share/systemtap/examples/io/ioblktime.stp (788B)
#!/usr/bin/stap
global req_time%[25000], etimes
probe ioblock.request
{
req_time[$bio] = gettimeofday_us()
}
probe ioblock.end
{
t = gettimeofday_us()
s = req_time[$bio]
delete req_time[$bio]
if (s) {
etimes[devname, bio_rw_str(rw)] <<< t - s
}
}
/* for time being delete things that get merged with others */
probe kernel.{trace("block_bio_frontmerge"),
trace("block_bio_backmerge")}
{
delete req_time[$bio]
}
probe timer.s(10), end {
ansi_clear_screen()
printf("%10s %3s %10s %10s %10s\n",
"device", "rw", "total (us)", "count", "avg (us)")
foreach ([dev,rw] in etimes - limit 20) {
printf("%10s %3s %10d %10d %10d\n", dev, rw,
@sum(etimes[dev,rw]), @count(etimes[dev,rw]), @avg(etimes[dev,rw]))
}
delete etimes
}