Re: [LSF/MM/BPF TOPIC] State Of The Page

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On 2023/1/27 00:40, Matthew Wilcox wrote:
I'd like to do another session on how the struct page dismemberment
is going and what remains to be done.  Given how widely struct page is
used, I think there will be interest from more than just MM, so I'd
suggest a plenary session.

If I were hosting this session today, topics would include:

Splitting out users:

  - slab (done!)
  - netmem (in progress)
  - hugetlb (in akpm)
  - tail pages (in akpm)
  - page tables
  - ZONE_DEVICE

Users that really should have their own types:

  - zsmalloc
  - bootmem
  - percpu
  - buddy
  - vmalloc

Converting filesystems to folios:

  - XFS (done)
  - AFS (done)
  - NFS (in progress)
  - ext4 (in progress)
  - f2fs (in progress)
  - ... others?

Unresolved challenges:

  - mapcount
  - AnonExclusive
  - Splitting anon & file folios apart
  - Removing PG_error & PG_private

I'm interested in this topic too, also I'd like to get some idea of the
future of the page dismemberment timeline so that I can have time to keep
the pace with it since some embedded use cases like Android are
memory-sensitive all the time.

Minor, it seems some apis still use ->lru field to chain bulk pages,
perhaps it needs some changes as well:
https://lore.kernel.org/r/20221222124412.rpnl2vojnx7izoow@xxxxxxxxxxxxxxxxxxx
https://lore.kernel.org/r/20230214190221.1156876-2-shy828301@xxxxxxxxx

Thanks,
Gao Xiang


This will probably all change before May.

I'd like to nominate Vishal Moola & Sidhartha Kumar as invitees based on
their work to convert various functions from pages to folios.



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