Re: [RFC] Systemtap translator support for hardware breakpoints on

[fche at redhat dot com (Frank Ch. Eigler)]

roland wrote:

> [...]
> What I think you'd really want is:
> 	probe kernel.data($variable).write { ... }
> That means "variable" gets looked up by $ rules  [...]

This is sensible, but will require a parser-level language change.

> [...]
> If you wanted:
> 	probe kernel.data($c).write
> i.e.:
> 	probe kernel.data(0x12c).write.length(4)
> you can't get it.  To start with, the translator says .length(8) is your
> only option, you can't have it.  Then it says 0x12c is not aligned to 8,
> you can't have it.  [...]

The translator need not veto such a script request.  It should be able
to fulfill it by rounding up/aligning down, then filtering the
resulting callbacks.


> [...]
> 	probe kernel.data($c).change { other_stuff() }
> [...]

Neat idea.


- FChE