Re: 1M hugepage size being registered on Linux

Michal Such=C3=A1nek [off-list ref] writes:

On Tue, 20 Jun 2017 10:47:47 -0300
victora [off-list ref] wrote:

quoted

Hi Alistair/Jeremy,
=20
I am working on a bug related to 1M hugepage size being registered on=20
Linux (Power 8 Baremetal - Garrison).
=20
I was checking dmesg and it seems that 1M page size is coming from=20
firmware to Linux.
=20
[    0.000000] base_shift=3D20: shift=3D20, sllp=3D0x0130,
avpnm=3D0x00000000, tlbiel=3D0, penc=3D2
[    1.528867] HugeTLB registered 1 MB page size, pre-allocated 0
pages
=20
Should Linux support this page size? As afar as I know, this was an=20
unsupported page size in the past isn't it? If this should be
supported now, is there any specific reason for that?

Hello,

a525108cf1cc powerpc/mm/hugetlb: Filter out hugepage size not supported
by page table layout

Should reject unsupported huge page sizes, right?

Yes, see my reply.

cheers