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.
