Return probes

[Frank Ch. Eigler]

Perry Cheng <perryche@us.ibm.com> writes:

> The systemtap script below fails but works if the return probe is omitted. 
> [...]  I am using a very recent version of stap (version 0.5.13
> built 2007-02-12) running on a 2.6.16 kernel [...]

IIRC, there have been several kernel-side fixes to k[ret]probes since
2.6.16 that may relate to this.  Systemtap proper is unlikely to be
the culprit.

> probe kernel.function("__handle_mm_fault").return

That's a sensitive part of the kernel, but probing it should probably work.

- FChE