David Gibson wrote:
> On Tue, Nov 27, 2007 at 11:03:16PM -0600, Jon Tollefson wrote:
>> This patch adds reliability to the 64K huge page option by making use of
>> the PMD for 64K huge pages when base pages are 4k. So instead of a 12
>> bit pte it would be 7 bit pmd and a 5 bit pte. The pgd and pud offsets
>> would continue as 9 bits and 7 bits respectively. This will allow the
>> pgtable to fit in one base page. This patch would have to be applied
>> after part 1.
>
> Hrm.. shouldn't we just ban 64K hugepages on a 64K base page size
> setup? There's not a whole lot of point to it, after all...
>
Actually, it sounds to me like an ideal way to benchmark the efficiency of the
hugepage implementation and VM effects, without the TLB performance obscuring
the results.
I agree that it's not something people will want to do very often, but the same
can be said about quite a lot of strange things that we allow just because
there's no fundamental reason why they cannot be.
-- Chris
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
