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Re: perfmon2 TODO list
- From: "Frank Ch. Eigler" <fche at redhat dot com>
- To: perfmon at napali dot hpl dot hp dot com
- Cc: systemtap at sources dot redhat dot com
- Date: Thu, 13 Apr 2006 12:41:12 -0400
- Subject: Re: perfmon2 TODO list
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?
- FChE