[PATCH mm-unstable v1 0/4] Improve mem_cgroup_iter()

[Kinsey Ho <kinseyho@google.com>]

Incremental cgroup iteration is being used again [1], but incremental
cgroup iteration was introduced for cgroup v1. It hasn't been fully
maintained for many years. This patchset improves the reliability of
mem_cgroup_iter(), along with improving simplicity and code readability.

[1] https://lore.kernel.org/20240514202641.2821494-1-hannes@cmpxchg.org/

Kinsey Ho (4):
  mm: don't hold css->refcnt during traversal
  mm: increment gen # before restarting traversal
  mm: restart if multiple traversals raced
  mm: clean up mem_cgroup_iter()

 include/linux/memcontrol.h |  6 +--
 mm/memcontrol.c            | 84 +++++++++++++++-----------------------
 2 files changed, 37 insertions(+), 53 deletions(-)

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2.45.2.1089.g2a221341d9-goog