linux-kernel - [PATCH v4 0/2] vmscan: enforce mems

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Message-ID: <20250422012616.1883287-1-gourry@gourry.net>
Date: Mon, 21 Apr 2025 21:26:13 -0400
From: Gregory Price <gourry@...rry.net>
To: linux-mm@...ck.org
Cc: cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	kernel-team@...a.com,
	longman@...hat.com,
	hannes@...xchg.org,
	mhocko@...nel.org,
	roman.gushchin@...ux.dev,
	shakeel.butt@...ux.dev,
	muchun.song@...ux.dev,
	tj@...nel.org,
	mkoutny@...e.com,
	akpm@...ux-foundation.org
Subject: [PATCH v4 0/2] vmscan: enforce mems_effective during demotion

Change reclaim to respect cpuset.mems_effective during demotion when
possible. Presently, reclaim explicitly ignores cpuset.mems_effective
when demoting, which may cause the cpuset settings to violated.

Implement cpuset_node_allowed() to check the cpuset.mems_effective
associated wih the mem_cgroup of the lruvec being scanned. This only
applies to cgroup/cpuset v2, as cpuset exists in a different hierarchy
than mem_cgroup in v1.

This requires renaming the existing cpuset_node_allowed() to be
cpuset_current_now_allowed() - which is more descriptive anyway - to
implement the new cpuset_node_allowed() which takes a target cgroup.

v4:
- explicitly expect v1 instead of checking for empty effective_mems.
  this was the case anyway since cpuset and mem_cgroup are in different
  heirarchy in v1.
- update docs to reflect this
- rcu_read_lock instead of taking a global lock.
- cpuset header fixup when compiled out.

Gregory Price (2):
  cpuset: rename cpuset_node_allowed to cpuset_current_node_allowed
  vmscan,cgroup: apply mems_effective to reclaim

 .../ABI/testing/sysfs-kernel-mm-numa          | 16 +++++---
 include/linux/cpuset.h                        |  9 +++-
 include/linux/memcontrol.h                    |  6 +++
 kernel/cgroup/cpuset.c                        | 30 +++++++++++++-
 mm/memcontrol.c                               |  6 +++
 mm/page_alloc.c                               |  4 +-
 mm/vmscan.c                                   | 41 +++++++++++--------
 7 files changed, 84 insertions(+), 28 deletions(-)

-- 
2.49.0