Re: [RFC] Hardware Breakpoint support for systemtap translator

[Roland McGrath <roland at redhat dot com>]

> Enabling systemtap to set hardware breakpoints at runtime would be a 
> very useful feature to have, but it presents a problem. Kprobe handlers 
> get executed in exception context, and it is not possible to register a 
> hardware breakpoint from within exception context. I'm wondering how it 
> could be implemented..

Hmm.  That seems like a general systemtap issue for a variety of features
down the line.  There are other things for which dynamic setup can only be
done from a safer process context, such as dynamically enabling various
sorts of user probes.


Thanks,
Roland