On Wed, Aug 10, 2016 at 03:54:17PM +0200, Peter Zijlstra wrote: > On Wed, Aug 03, 2016 at 06:23:58PM +0200, Jiri Olsa wrote:
SNIP > > --- > > diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c > > index 157bf0957219..484f7d357c77 100644 > > --- a/arch/x86/kernel/smpboot.c > > +++ b/arch/x86/kernel/smpboot.c > > @@ -340,7 +340,7 @@ static void __init smp_init_package_map(void) > > ncpus = 1; > > } > > > > - __max_logical_packages = DIV_ROUND_UP(total_cpus, ncpus); > > + __max_logical_packages = total_cpus; > > This seems undesirable.. it would grow the bitmap unnecessarily big on > most setups. > > Is there no way to detect the brain damage inflicted by that BIOS option > and fudge ncpus in that case? yea, I have no idea.. that's why this is RFC ;-) maybe we could also gradually allocate this bitmap in topology_update_package_map.. I'll check on that jirka
