linux-kernel - [PATCH v3 0/2] vmscan: enforce mems

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250419053824.1601470-1-gourry@gourry.net>
Date: Sat, 19 Apr 2025 01:38:22 -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 v3 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 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.

v3:
- remove cgroup indirection, call cpuset directly from memcontrol
- put mem_cgroup_node_allowed in memcontrol.c to reduce cpuset.h
  include scope
- return true if mems_effective is empty, and don't walk the parents
  as recommended by Waiman Long.

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          | 14 ++++---
 include/linux/cpuset.h                        |  9 +++-
 include/linux/memcontrol.h                    |  6 +++
 kernel/cgroup/cpuset.c                        | 25 ++++++++++-
 mm/memcontrol.c                               |  6 +++
 mm/page_alloc.c                               |  4 +-
 mm/vmscan.c                                   | 41 +++++++++++--------
 7 files changed, 78 insertions(+), 27 deletions(-)

-- 
2.49.0