Systemtap performance impact on N800

[Frank Ch. Eigler]

"Bruno Abinader" <bruno.abinader@openbossa.org> writes:

> We at INdT created a document called "Systemtap performance impact on
> N800", with performance comparisons between Kprobes, Systemtap and
> Oprofile usage. Feel free to read and ask us questions about our
> results!

Thanks for running these tests.  One important thing to watch out for
is that you're comparing apples to apples.

For example, the stap_gettimeofday.stp file in section 2.2.3 asks to
probe both function entry and return, whereas the kprobe code listed
only probes function entry.  For another, the stap_tapsets.stp test in
section 3.2 asks to trace some data for every probe hit, but I see no
corresponding kprobe source to confirm that equivalent output is being
generated there.

- FChE