I have "a few" projects I'm working on / intending to work on in the near future.

Folios is the big one.  This has sub-projects:
 * MM:
  * Get large folio support in (5.18)
  * Convert GUP to folios (5.18)
  * Convert page_vma_mapped to folios
  * Convert rmap to folios (depends on page_vma_mapped)
  * Convert vmscan to folios (depends on rmap)
  * Move split_huge_page() to non-THP code
  * Get rid of all thp_size(), thp_order() and thp_nr_pages() calls (probably?)
 * FS:
  * Adapt NFS to use large folios
  * Adapt btrfs to use large folios
  * Adapt CIFS to use large folios
  * Convert the a_ops to take folios instead of pages

Tangential to folios:
 * Phyr
 * Slab (Vlastimil took this over.  merged 5.17)
 * net pool as its own type
 * pt pages as its own type
 * zspage as its own type
 * Can we make mapcount more sensible or disappear entirely?
 * Remove aops->readpages
 * Implement iomap ->writepages properly

Unrelated to folios:
 * Maple Tree (Liam is doing most of the work)
 * Shrinking struct mutex (Vishal has taken this on)
 * Removing PG_private
 * Synchronous ->readpage
 * Broadcast readpage errors to all waiters
 * Implement ->readahead for squashfs (Hsin-Yi)
 * MatthewWilcox/ImprovedReadaheadAlgorithm
 * Make the last argument to read_mapping_page() / read_mapping_folio() a struct file ptr
 * Slab Sevenths (Bill is attacking this one)
 * NUMA-aware zero page (Bill is working on this one too)
 * NUMA text pages in the page cache (Linus seems sceptical)
 * Usercopy (5.18.  Sent to Kees)
   * If we check ->mapping for order-0 pages, is that a sure sign of individual allocation?
 * Big Buckets (or integrate with Maple Tree)
 * Readahead for compressed filesystems in general
 * Fix XArray memory leak when memory allocation fails
 * Removing b_end_io (Jitendra)
 * Use an iov_iter in proc/vmcore (sent for 5.17?  5.18?)
 * Enable -Wshadow (needs header file cleanups)
 * Share memory when caching reflinked files