1M hugepage size being registered on Linux

[Mauricio Faria de Oliveira]

On 06/21/2017 07:33 AM, Michael Ellerman wrote:
>> I am working on a bug related to 1M hugepage size being registered on
>> Linux (Power 8 Baremetal - Garrison).

> Wasn't that caused by a firmware bug?

Ben/Stewart, does that ring a bell, something new, intended or not? :- )

Thanks,

>> I was checking dmesg and it seems that 1M page size is coming from
>> firmware to Linux.
>>
>> [    0.000000] base_shift=20: shift=20, sllp=0x0130, avpnm=0x00000000,
>> tlbiel=0, penc=2
>> [    1.528867] HugeTLB registered 1 MB page size, pre-allocated 0 pages
>>
>> Should Linux support this page size?
> Does it work?:)
> 
> The user manual says it's a supported size, but I thought it didn't work
> (in hardware) for some reason.

-- 
Mauricio Faria de Oliveira
IBM Linux Technology Center