On 2022/1/7 12:55, Michael Ellerman wrote:

Qu Wenruo [off-list ref] writes:

quoted

On 2022/1/7 00:31, Neal Gompa wrote:

quoted

On Wed, Jan 5, 2022 at 7:05 AM Qu Wenruo [off-list ref] wrote:

quoted

Hi Christophe,

I'm recently enhancing the subpage support for btrfs, and my current
branch should solve the problem for btrfs to support larger page sizes.

But unfortunately my current test environment can only provide page size
with 64K or 4K, no 16K or 128K/256K support.

Mind to test my new branch on 128K page size systems?
(256K page size support is still lacking though, which will be addressed
in the future)

https://github.com/adam900710/linux/tree/metadata_subpage_switch

The Linux Asahi folks have a 16K page environment (M1 Macs)...

Su Yue kindly helped me testing 16K page size, and it's pretty OK there.

So I'm not that concerned.

It's 128K page size that I'm a little concerned, and I have not machine
supporting that large page size to do the test.

Did Christophe say he had a 128K system to test on?

In mainline powerpc only supports 4K/16K/64K/256K.

AFAIK there's no arch with 128K page size support, but that's only based
on some grepping, maybe it's hidden somewhere.

My bad, I thought there would be 128K since there is 256K and 64K 
support, but that's totally wrong.

I'll get PPC guys informed when the 256K page size problem is solved, 
and then ask for your help.

Thanks,
Qu

cheers