Hi Jaegeuk Kim, Chao Yu,
I heard (via Matthew Wilcox) that you may be in the process of forming plans to
add large folio support to f2fs? If so, I wonder if you could let me know how
those plans are progressing? I saw your v6.12-rc1 pull request did a lot of
conversion from struct page to struct folio (of the small variety for now) but
wondered if this is intended as pre-work for enabling large folios?
I've been doing a lot of work on the anonymous memory side to support large
folios ("mTHP") and hook that up to arm64's contpte pgtable support. This
improves performance nicely.
Additionally I have experimented (on XFS) with ensuring that text mappings are
contpte mapped where possible and this reduces pressure in the iTLB to improve
performance further. But it all relies on the file system supporting large
folios. I'd very much like to realize these performance gains on Android, but
that requires the file systems that Android uses to support large folios.
It would be great to understand your plans, if any, and figure out if/where Arm
may be able to help accelerate activities in this area. I'm not (yet!) an fs
expert, but I see that f2fs is already using iomap, so perhaps now that you are
supporting small folios, switching up to large folios is not too big of a step?
Thanks,
Ryan
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