Re: [PATCH V6 09/14] perf/x86/intel: Support TopDown metrics on Ice Lake

[Peter Zijlstra]

On Tue, Jul 21, 2020 at 10:38:59AM -0700, Andi Kleen wrote:
> > Also, that for_each_set_bit() loop, trying to find the events to
> > update...
> > 
> > Can't we, instead, make the SLOTS update advance 5 running counters in
> > cpuc and feed the events off of that?
> 
> The original patches implemented this through a perf transaction and a
> cache.  I think what you're suggesting is similar to the old cache.

I can't remember :-) Anyway, the TXN_READ thing Kan pointed out should
work fine, I just missed it when reading through the code.