[PATCH mm-unstable v2 0/5] Improve mem_cgroup_iter()

[Kinsey Ho <kinseyho@google.com>]

Incremental cgroup iteration is being used again [1]. This patchset
improves the reliability of mem_cgroup_iter(). It also improves
simplicity and code readability.

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

v2: add patch to clarify css sibling linkage is RCU protected. The
kernel build bot RCU sparse error from v1 has been ignored.
v1: https://lore.kernel.org/20240724190214.1108049-1-kinseyho@google.com/

Kinsey Ho (5):
  cgroup: clarify css sibling linkage is protected by cgroup_mutex or
    RCU
  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/cgroup-defs.h |  6 ++-
 include/linux/memcontrol.h  |  6 +--
 kernel/cgroup/cgroup.c      | 16 +++----
 mm/memcontrol.c             | 84 +++++++++++++++----------------------
 4 files changed, 51 insertions(+), 61 deletions(-)

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2.46.0.76.ge559c4bf1a-goog