Re: [PATCH 1/3] powerpc/mm/hash: Avoid resizing-down HPT on first memory hotplug

2021-04-08 Thread Leonardo Bras
Hello David, thanks for your feedback. On Mon, 2021-03-22 at 17:49 +1100, David Gibson wrote: > I don't love this approach. Adding the extra flag at this level seems > a bit inelegant, and it means we're passing up an easy opportunity to > reduce our resource footprint on the host. I understand,

Re: [PATCH 1/3] powerpc/mm/hash: Avoid resizing-down HPT on first memory hotplug

2021-03-22 Thread David Gibson
On Fri, Mar 12, 2021 at 04:29:39AM -0300, Leonardo Bras wrote: > Because hypervisors may need to create HPTs without knowing the guest > page size, the smallest used page-size (4k) may be chosen, resulting in > a HPT that is possibly bigger than needed. > > On a guest with bigger page-sizes, the a

[PATCH 1/3] powerpc/mm/hash: Avoid resizing-down HPT on first memory hotplug

2021-03-11 Thread Leonardo Bras
Because hypervisors may need to create HPTs without knowing the guest page size, the smallest used page-size (4k) may be chosen, resulting in a HPT that is possibly bigger than needed. On a guest with bigger page-sizes, the amount of entries for HTP may be too high, causing the guest to ask for a