Re: [PATCH] perf/x86: check ucode before disabling PEBS on SandyBridge

Peter Zijlstra
2012-06-07T11:16:10Z

On Thu, 2012-06-07 at 12:48 +0200, Stephane Eranian wrote:
> >> The warning could also be done on boot. But the check has to be done
> >> when the event is created.
> >
> > Is this because of the ucode loader not having done its thing yet etc..?

Ah, its because you can update ucode at runtime of course.

A quick look at the ucode loader doesn't show it having a notifier
either, so then yeah we need to check on every event creation :/

Or we could put a hook in the ucode loader.