On Thu, Jun 05, 2014 at 02:55:05PM +0200, Stephane Eranian wrote: > On Thu, Jun 5, 2014 at 2:50 PM, Peter Zijlstra <pet...@infradead.org> wrote: > > 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. > > and what initcall would that be?
Pretty much anything !early_initcall() is ran after SMP bringup iirc.
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