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

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On 2023/2/22 03:09, Yang Shi wrote:
On Tue, Feb 21, 2023 at 10:08 AM Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx> wrote:



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

The dm-crypt patches don't use list anymore. The bulk allocator still
supports the list version, but so far there is no user, so it may be
gone soon.

Thanks, it's just a detailed minor stuff relating to page->lru.  Currently
I'm no rush to evaluate/use it.



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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