On Thu, Jun 11, 2020 at 07:16:02AM -0700, Dave Hansen wrote:
> On 6/9/20 3:54 PM, Daniel Jordan wrote:
> > + /*
> > + * Use max block size to minimize overhead on bare metal, where
> > + * alignment for memory hotplug isn't a concern.
> > + */
> > + if (hypervisor_is_type(X86_HYPER_NATIVE)) {
> > + bz = MAX_BLOCK_SIZE;
> > + goto done;
> > + }
>
> What ends up being the worst case scenario? Booting a really small
> bare-metal x86 system, say with 64MB or 128MB of RAM? What's the
> overhead there?
Might not be following you, so bear with me, but we only get to this check on a
system with a physical address end of at least MEM_SIZE_FOR_LARGE_BLOCK (64G),
and this would still (ever so slightly...) reduce overhead of memory block init
at boot in that case.
