This is good news, Stephane. Thank you. For power's need, I think we can
limit it to just a couple of functions.
I will post a proposal about what I'd like to add to libpfm, but it may not
be for awhile yet. We are looking ahead
to some degree.
Regards,
- Corey,
Corey Ashford
Software Engineer
IBM Linux Technology Center, Linux Toolchain
Beaverton, OR
503-578-3507
[EMAIL PROTECTED]
"stephane eranian" <[EMAIL PROTECTED]> wrote on 09/15/2008 09:37:51
PM:
> Corey,
>
> On Tue, Sep 16, 2008 at 2:24 AM, Corey Ashford <[EMAIL PROTECTED]>
wrote:
> > Hello,
> >
> > I'd like to open a discussion of allowing certain architecture-specific
> > functions into libpfm.
> >
> This is certainly a useful discussion!
>
> > Specifically, on the powerpc arch, we have this mechanism of
pre-defined
> > groups of events that are allowed to be traced in counters
simultaneously.
> >
> > However, this information is currently buried inside of libpfm and
> > there's no way for a caller of libpfm to extract this information using
> > any method besides trial and error (by attempting to put events in the
> > same event set, and seeing if dispatch generates an error).
> >
> > I realize that other architectures don't use this pre-defined group
> > approach, so this would have to be an arch-specific function.
> >
> > So, first, I'd like to ask if there's any sort of strong objection to
> > adding arch-specific functions to libpfm. Of course, we'd have to make
> > a strong argument that the function would be useful to callers of
libpfm.
> >
> Model or arch-specific functions already exist for Itanium processors and
> even X86 processors. The rules that I have used are:
>
> - must be useful to caller
>
> - cannot be retrieved using the generic libpfm API
>
> - function naming scheme is: pfm_XXX_func() where XXX is either the
> model name
> (or acronym) or arch name. For instance, on Itanium2, we have
> pfm_ita2_is_ear().
>
> - does return an error code
>
> - must have prototype defined in pfmlib_XXX.h
>
> So feel free to define whatever you think could be useful.
>
> Thanks.
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