Re: [PATCH 2/2] perf stat: Remove nmi watchdog check code again

[Arnaldo Carvalho de Melo]

Em Thu, Jun 09, 2016 at 08:17:16AM -0700, Andi Kleen escreveu:
> On Thu, Jun 09, 2016 at 10:42:08AM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Jun 09, 2016 at 06:14:39AM -0700, Andi Kleen escreveu:
> > > Now that the NMI watchdog runs with reference cycles, and does not

> > Now as in when? We should at least warn the user that the kernel used is
> > one where the NMI watchdog will not get in the way of topdown. Is there
> > a programmatic way to discover that?
 
> If the other patch gets merged at the same time as the TopDown patches
> it's only a few days in tip which don't support it, no released kernel.
> So no need to check for this case.

Ok, I see, since on older kernels it will fail before that point, when
not finding the topdown counters, no problem, super small window, thanks
for clarifying.

- Arnaldo