linux-kernel - [PATCH v2 0/3] mm: fix oom-killer not being invoked when demotion is enabled

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: <20251222004834.10539-1-akinobu.mita@gmail.com>
Date: Mon, 22 Dec 2025 09:48:31 +0900
From: Akinobu Mita <akinobu.mita@...il.com>
To: akinobu.mita@...il.com
Cc: linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	akpm@...ux-foundation.org,
	axelrasmussen@...gle.com,
	yuanchu@...gle.com,
	weixugc@...gle.com,
	hannes@...xchg.org,
	david@...nel.org,
	mhocko@...nel.org,
	zhengqi.arch@...edance.com,
	shakeel.butt@...ux.dev,
	lorenzo.stoakes@...cle.com,
	Liam.Howlett@...cle.com,
	vbabka@...e.cz,
	rppt@...nel.org,
	surenb@...gle.com
Subject: [PATCH v2 0/3] mm: fix oom-killer not being invoked when demotion is enabled

On systems with multiple memory-tiers consisting of DRAM and CXL memory,
the OOM killer is not invoked properly.

This patchset includes a fix for the issue and an enhancement that makes
the issue reproducible with numa emulation.

v2:
- fix the explanation about cmdline parameter in the commit log
- add document for NUMA emulation
- describe reproducibility with !mglru in the commit log
- removed unnecessary consideration for scan control when checking demotion_nid watermarks

v1:
- https://lore.kernel.org/linux-mm/20251208094028.214949-1-akinobu.mita@gmail.com/T/

original report:
- https://lore.kernel.org/lkml/20251022135735.246203-1-akinobu.mita@gmail.com/T

Akinobu Mita (3):
  mm: memory-tiers, numa_emu: enable to create memory tiers using fake
    numa nodes
  mm: numa_emu: add document for NUMA emulation
  mm/vmscan: don't demote if there is not enough free memory in the
    lower memory tier

 Documentation/mm/index.rst          |  1 +
 Documentation/mm/numa_emulation.rst | 30 +++++++++++++++++++++++++++++
 mm/numa_emulation.c                 | 26 +++++++++++++++++++++++++
 mm/vmscan.c                         | 13 ++++++++++++-
 4 files changed, 69 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/mm/numa_emulation.rst

-- 
2.43.0