On Thu, Jun 05, 2014 at 12:16:01PM +0100, Matt Fleming wrote: > On 5 June 2014 11:19, Stephane Eranian <eran...@google.com> wrote: > > How would you know that you have a uniform workload from inside > > the kernel? > > That's what I'm asking you ;-) > > >> Does cpu_sibling_map not give you some indication of whether HT is > >> enabled? I think the topology_thread_cpumask() is the topology API for > >> that. But I could most definitely be wrong. Hopefully someone on the > >> Cc list will know. > >> > > Remember trying some of that, but when perf_event is initialized, those > > masks are not yet setup properly. > > Oh, bummer.
So we init perf very early to get nmi-watchdog up and running, but there's no reason you cannot register a second initcall later and flip the switch from it there.
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