Re: [RFC] perf: ref-cycle useless with watchdog changes

[Peter Zijlstra]

On Sun, Jul 10, 2016 at 11:48:11AM -0700, Stephane Eranian wrote:
> So we either redirect ref-cycles towards 0x013c
> (cpu_clk_unhalted:xlck) or another event maybe

Another solution is us introducing (another) fake event, say 0x0400,
which will have a constrained mask of: 0x0F | (6 << 32) and varies in
actual encoding depending on which counter it lands on.

That way we have more flexibility in scheduling the NMI watchdog, and
its exact period isn't _that_ important; although we could obviously
also fix up some of that if we wanted.