Re: Accessing Pentium MSRs
Alan Cox (alan@cymru.net)
Tue, 9 Apr 1996 13:23:34 +0100 (BST)
> Over the weekend, I crufted together a little kernel patch that adds two
> syscalls to let processes access some of the Pentium MSR registers. Using these
> event counters, you can analyze how your code behaves (e.g. how often the
> second pipeline is in use, or how many branches are taken). If someone is
> interested, I'll post the patch here.
Sounds useful. I assume you are also saving/restoring the values over
context switches ?. Would making the MSR access a ptrace extension be better
than new syscalls ?