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Sun, 21 Dec 2025 16:49:15 -0800 (PST) Received: from localhost.localdomain ([240f:34:212d:1:df7d:b611:ffaf:6d45]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c1e79620bd3sm7461832a12.4.2025.12.21.16.49.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 21 Dec 2025 16:49:15 -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 Subject: [PATCH v2 0/3] mm: fix oom-killer not being invoked when demotion is enabled Date: Mon, 22 Dec 2025 09:48:31 +0900 Message-ID: <20251222004834.10539-1-akinobu.mita@gmail.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 45AF11A0003 X-Rspamd-Server: rspam03 X-Stat-Signature: 17zzz7sn851w7bnajx6d8wfa7my95ipm X-Rspam-User: X-HE-Tag: 1766364557-836204 X-HE-Meta: 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 lkjfpRZt JXz3IEBP5vqLSuTW9H3FGAGS+RVy/d7HXNzNZgZxqJtOXkxJSCgPpjGmJG7N5hIa9Db9MgotCaR5eacHwDZFXYOhlPxveG6sAm/jwzVaA9zs4bx6tFVlvtWfzSRrh8UUKdgElnaPj8QGLIq0lDNxvxGnPdzou+URyyqNF X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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