[PATCH v2 0/3] introduce uncharged file mapped folios

[Boris Burkov <boris@bur.io>]

I would like to revisit Qu's proposal to not charge btrfs extent_buffer
allocations to the user's cgroup.

https://lore.kernel.org/linux-mm/b5fef5372ae454a7b6da4f2f75c427aeab6a07d6.1727498749.git.wqu@suse.com/

I believe it is detrimental to randomly account these global pages to
the cgroup using them, basically at random. A bit more justification
and explanation in the patches themselves.

---
Changelog:
v2:
- switch from filemap_add_folio_nocharge() to AS_UNCHARGED on the
  address_space.
- fix an interrupt safety bug in the vmstat patch.
- fix some foolish build errors for CONFIG_MEMCG=n

Boris Burkov (3):
  mm/filemap: add AS_UNCHARGED
  mm: add vmstat for cgroup uncharged pages
  btrfs: set AS_UNCHARGED on the btree_inode

 fs/btrfs/disk-io.c      |  1 +
 include/linux/mmzone.h  |  3 +++
 include/linux/pagemap.h |  1 +
 mm/filemap.c            | 29 +++++++++++++++++++++++++----
 mm/vmstat.c             |  3 +++
 5 files changed, 33 insertions(+), 4 deletions(-)

-- 
2.50.1