/usr/share/systemtap/examples/profiling
Edit: /usr/share/systemtap/examples/profiling/pf4.stp (952B)
#!/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
# or perf.type(0).config(0).sample(NNNN) for apprx. every NNNN tsc ticks
{
# add filtering as required:
# if (execname() != "program") next
# if (uid() != 4345) next
# if (! user_mode()) next
if (target() && pid() != target()) next # be sensitive to -x PID or -c CMD
# NB: we count total hits also, because the report only shows top few
pcount <<< 1
bt = user_mode() ? sprint_ubacktrace() : sprint_backtrace()
profile[cpu(),bt] <<< 1
}
probe end,error,timer.ms(5000) {
printf ("\n--- %d samples recorded:\n", @count(pcount))
foreach ([c,b] in profile- limit 20) {
printf ("%d hits on cpu %d\n%s\n\n", @count(profile[c,b]), c, b)
}
delete profile
delete pcount
}