Re: [PATCH 0/2] x86/intel_rdt and perf/x86: Fix lack of coordination with perf

Peter Zijlstra
2018-08-02T20:28:28Z

On Thu, Aug 02, 2018 at 01:06:19PM -0700, Dave Hansen wrote:
> On 08/02/2018 12:54 PM, Peter Zijlstra wrote:
> >> I totally understand not wanting to fill the tree with code hijacking
> >> the raw PMU. Is your reaction to this really around not wanting to
> >> start down the slippery slope that ends up with lots of raw PMU "owners"?
> > That and the fact that multiple owner directly contradicts what perf set
> > out to do, provide resource arbitration for the PMU.
> >
> > Not being able to use both perf and this resctl thing at the same time
> > is utter crap. You will not get special dispensation.
>
> Is there something we could do in the middle, like have perf itself be
> in charge of doing all the programming, but the psuedo-locking could
> still _read_ the counters?

perf has all of that.