[PATCH 0/2] mm/vmscan: remove obsolete offlined memcg reclaim handling

["T.J. Mercier" <tjmercier@google.com>]

Since commit f1cf8d2f36dc ("mm: memcontrol: eliminate the problem of
dying memory cgroup for LRU folios") and commit 0e0ac326c511 ("memcg:
move LRU size accounting on reparenting instead of copying it"), LRU
folios and their size accounting are reparented to the parent memcg
before a memcg is offlined, leaving the offlined memcg's lruvec
permanently empty.

This series removes the remaining reclaim special-casing for offlined
memcgs that assumed they could still hold LRU folios:
    1. Remove redundant !mem_cgroup_online() checks in vmscan.c
    2. Stop rotating offlined memcgs to the head of the old generation
       (MEMCG_LRU_OLD) in MGLRU.

T.J. Mercier (2):
  mm/vmscan: remove redundant !mem_cgroup_online() checks
  mm/mglru: stop rotating offlined memcgs to the old generation

 Documentation/mm/multigen_lru.rst |  4 +--
 include/linux/mmzone.h            | 22 +++++---------
 mm/memcontrol.c                   |  1 -
 mm/vmscan.c                       | 48 ++++---------------------------
 4 files changed, 14 insertions(+), 61 deletions(-)


base-commit: 2bba28e98578de622ef307d00875aa8f8bca3d10
-- 
2.56.0.307.g5fe7bd680c-goog