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Experiences with cvs runtime
- From: Ananth N Mavinakayanahalli <amavin at redhat dot com>
- To: SystemTAP <systemtap at sources dot redhat dot com>
- Date: Wed, 27 Apr 2005 15:45:34 -0400
- Subject: Experiences with cvs runtime
Hi,
I was trying to use the probes in the runtime cvs to see if they can be
used to test the kprobes scalability patch prototype. I ran into a few
problems when trying to use kprobe_where_func.c.
This test was carried out on a system that was running a preempt enabled
smp kernel (though the machine itself was uni processor). Digging around
a bit, I see that:
- many runtime (and one relayfs) files use smp_processor_id() without
disabling preemption
- the stp script assumes that relayfs is built in as a kernel module,
while it can be configured tristate (<*>, <M>, <>).
I think any code that touches the kernel needs to be tested for all
configurations: uni, smp, smp with preemption enabled etc.
Thanks,
Ananth