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Thu, 08 Jan 2026 02:16:14 -0800 (PST) Received: from localhost.localdomain ([240f:34:212d:1:8352:dfa:3b18:eb4e]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a3e3c49299sm73785245ad.42.2026.01.08.02.16.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Jan 2026 02:16:13 -0800 (PST) From: Akinobu Mita To: akinobu.mita@gmail.com Cc: linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, hannes@cmpxchg.org, david@kernel.org, mhocko@kernel.org, zhengqi.arch@bytedance.com, shakeel.butt@linux.dev, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, bingjiao@google.com Subject: [PATCH v3 0/3] mm: fix oom-killer not being invoked when demotion is enabled Date: Thu, 8 Jan 2026 19:15:32 +0900 Message-ID: <20260108101535.50696-1-akinobu.mita@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. v3: - rebase to linux-next (next-20260108), where demotion target has changed from node id to node mask. 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 | 16 ++++++++++++++- 4 files changed, 72 insertions(+), 1 deletion(-) create mode 100644 Documentation/mm/numa_emulation.rst -- 2.43.0