On 25/06/2024 13:37, Baolin Wang wrote:

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For other filesystems, like ext4, I did not found the logic to determin what
size of folio to allocate in writable mmap() path

Yes I'd be keen to understand this to. When I was doing contpte, page cache
would only allocate large folios for readahead. So that's why I wouldn't have

You mean non-large folios, right?

No I mean that at the time I wrote contpte, the policy was to allocate an
order-0 folio for any writes that missed in the page cache, and allocate large
folios only when doing readahead from storage into page cache. The test that is
regressing is doing writes.