/usr/share/systemtap/examples/process
Edit: /usr/share/systemtap/examples/process/wait4time.stp (1347B)
#!/usr/bin/stap
/*
* Copyright (C) 2006-2007 Red Hat Inc.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU General Public License v.2.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
.
*
* Print out the time spent in wait4 systemcall
*
* Format is:
* timestamp pid (executabable) wait4: time_us pid
*
* 155789807 4196 (ssh) wait4: 12 4197
* 158270531 3215 (bash) wait4: 5410460 -1
* 158270659 3215 (bash) wait4: 9 -1
* 158557461 2614 (sendmail) wait4: 27 -1
* 158557487 2614 (sendmail) wait4: 5 -1
*
*/
global start
global wait4_pid
function timestamp:long() {
return gettimeofday_us() - start
}
function proc:string() {
return sprintf("%d (%s)", pid(), execname())
}
probe begin {
start = gettimeofday_us()
}
probe syscall.wait4 {
// It would be nice to use @entry here, but "pid" has a non-trivial
// expression in the tapset which we probably shouldn't duplicate.
wait4_pid[tid()]=pid
}
probe syscall.wait4.return {
elapsed_time = gettimeofday_us() - @entry(gettimeofday_us())
printf("%d %s wait4: %d %d\n", timestamp(), proc(), elapsed_time,
wait4_pid[tid()])
delete wait4_pid[tid()]
}