linux-kernel - [PATCH 0/2] mm: fix oom-killer not being invoked when demotion is enabled

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Message-ID: <20251208094028.214949-1-akinobu.mita@gmail.com>
Date: Mon,  8 Dec 2025 18:40:26 +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 0/2] 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.

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

Akinobu Mita (2):
  mm: memory-tiers, numa_emu: enable to create memory tiers using fake
    numa nodes
  mm/vmscan: don't demote if there is not enough free memory in the
    lower memory tier

 mm/numa_emulation.c | 26 ++++++++++++++++++++++++++
 mm/vmscan.c         | 15 ++++++++++++++-
 2 files changed, 40 insertions(+), 1 deletion(-)

-- 
2.43.0