[perfmon] Re: perfmon2 TODO list

[Stephane Eranian]

Frank.

On Thu, Apr 13, 2006 at 12:41:12PM -0400, Frank Ch. Eigler wrote:
> Hi -
> 
> I am a developer on the systemtap project, which Will Cohen has
> referred you to earlier in the discussion.  I thought I would jump in
> just to add/refresh focus on one important perfmon requirement for
> systemtap: a kernel-side API.
> 
> Because of the way systemtap works, we need kernel-side modules to be
> able to at least *read* performance counters.  (Ideally, this should
> be an API that includes the 32->64-bit overflow support.)  In
> addition, it would be nice if the ioctl *configuration* interface was
> also available as a kernel-side API, so that systemtap probes could
> run the ioctl() equivalents from kernel space during session
> startup/shutdown.
> 
> Is this general need clear?  controversial?  easy?
> 
I think I understand the need. I am still not clear on
the context in which the perfmon call would be made.
I just posted a response to KEvin/Will on the perfmon mailing
list asking for clarifications on systemTap. I

thanks.