/usr/share/systemtap/examples/profiling
Edit: /usr/share/systemtap/examples/profiling/pf3.stp (992B)
#!/usr/bin/stap
%( CONFIG_64BIT == "y" %?
global profile%[20000], pcount
%:
# On a 32-bit platform, the profile array must be smaller, otherwise
# its allocation will fail on module startup.
global profile%[5000], pcount
%)
probe timer.profile {
pcount <<< 1
# NB: we resolve to a function name here (rather than recording only
# the PC), because during a later pc->name lookup, the process context
# may be different.
if (!user_mode())
try { // modname() can throw
fn = "k:".modname(addr()).":".symname(addr())
} catch {
fn = "k:
:".symname(addr())
}
else {
try { // umodname() can throw
fn = "u:".umodname(uaddr()).":".usymname(uaddr())
} catch {
fn = "u::".usymname(uaddr())
}
}
profile[fn] <<< 1
}
probe timer.ms(5000) {
printf ("\n--- %d samples recorded:\n", @count(pcount))
foreach (f in profile- limit 20) {
printf ("%-30s\t%6d\n", f, @count(profile[f]))
}
delete profile
delete pcount
}