From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f49.google.com (mail-pj1-f49.google.com [209.85.216.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B49B1B665 for ; Mon, 22 Dec 2025 00:49:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.49 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766364558; cv=none; b=OMhO+U6b5ZcMw3hPd67fx0qxESCgPBtBbKdRAKrNp61ICQDdGEqsnJ5GE17W4sPy0WwHIq+573aiVcAw4zjJeQfz6FCZvDQD5Wp75L+/2sBI3Q6Bi9LqEawrv19NdoYxRaDXXeYfKib/Koo6CB0si42scQsPhCC1gpv+XPa3iXw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766364558; c=relaxed/simple; bh=CH91PuAY67MGZZ03vEoPlphtK2px+k3b9iDcs5qtFpk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Qq10zFH6OQet5L+yoXgRQiPgAAutu3tCf6iGbv8uFiqLM3X//lmKPiV+B9CmRdYpGxl7czi4CiT6liozWbczYon/LQBh7Kl6825cABF1dbOwNk79j+46eEoc4nIRC1YuslOeMR6TEe4dg27JiC1GyT88vAz1I7vAnebbYR1GeCg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=jgIHRyCI; arc=none smtp.client-ip=209.85.216.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="jgIHRyCI" Received: by mail-pj1-f49.google.com with SMTP id 98e67ed59e1d1-34c27d14559so2655745a91.2 for ; Sun, 21 Dec 2025 16:49:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1766364556; x=1766969356; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=/vB6kAvgJ/UHgjs8UorfX5aUFI87Lf5p0yAYqtg4bPI=; b=jgIHRyCI44KQ6OueOfuHb9KIfvfLgdwn0IjiHwtSG3vlD1q+/OTHGgTL1sOwBFcEUv T4kRe9J2nzT2hKM5awkFs3H623RGaoLPG52EpoBInjZlmL7BjLoMkJGbFp8mKhWVFkH0 2ah+XgzQmpfgeX8egb1VohkZILTqPjlOnjB4AYm+fNqMYPZQKeZ6sJeigwU5icJT70s3 O0ReMkGx8lMRfEQyXo3yUOBeS1LOePcRFNG9ICxwJS69s1GVf/h/7461e6YG6zawmDyJ j0JO9GlYHwfeW1RDVa4KKrZULi56u+THAItbqabwAltKkmWDYSf/9g/GFPwfMaVnQ7wZ HR2Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1766364556; x=1766969356; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=/vB6kAvgJ/UHgjs8UorfX5aUFI87Lf5p0yAYqtg4bPI=; b=kAMZNc+DfYCooFgGWIAFbE9yjPSasS7T9zCyDpEHiO9oVoYUjDai5o7xeqEU08JoZZ WUtRWteCHAz+v9HKZwHeu+1F3SvT+qsOMzYf/CPoHNWoo4H+l75s6rldsK0suAmYkYxx 429kmMtjQ1E3ZtvN4rxkQB3ulHRoxJto7UnL7mMGgFthGPDEO9is1FzSBekw0fRgqFHn tWQBduhyZyxUn+xZeydFOkrEE1EKvdi3CbH0QR5pLJtsHX6dzSLk6VTJ/JXGDTPegzrf +U4a1K+koxKShUD81ksxKtao8C/cs47VhSz68THmhHaYxRg/FDQnhxIiNOa+xkHITIoZ qnYg== X-Forwarded-Encrypted: i=1; AJvYcCXmWG6JFZErXKD3YYf1/WdkmP63vvIod+tFcZa2Bh+QyTIGR2Beo5eX1wOyWG+75lCLBs8zR/w0osssDtI=@vger.kernel.org X-Gm-Message-State: AOJu0YxJbU6XraHqtgyJ0Y91xk/YQzBGO3w58Sw24cmPPxVB/PaqNTjb wbzOGqGcrPlCk4nLksb30itjXSMF5lsqQER5XJEtfD7VSHcO4kSzYp8a X-Gm-Gg: AY/fxX7w/bSZVzXMFsi3ivPdBjKk540+le3AjitTyBCLheQA5A/HawQdCNMc+4M8p8W DX3QebN6qm8BlKfulBTIN7bJ4YlrWCQ2a4WLRF3m5ciF7TFIQp8AkR1SfQUWgMRV9aVxDMYOq0F 0oFh4lx08Jy57uXSSnqhGUx8ajSz+ObiUIlUkV+qT41RRF6uw4LnxHYcnyWROuD7s/VF9Yx2C5g 5ANx9eF2xpVNs87HfeM6Pwme/3kUfo6RWFI4VHPzFGgYEQmrbay5eiliKTma7RgXZpuAWXdBUXZ Rd7ePKBMthTUNyxWh3sckS2BJuPIUvGApaGzGqbdX9zssqPjZXRGNdS5g1S6buicTHHzBhVLpnB T0iiNdpwwFHZ5qzsTGgh/AW6y9pJUntiz0CcGMIW95yXL4yBGV61dJ576nWa3ZDZa5yxwzfZsQT rfjbOujtHa9tpQaARYPZPaQNSLUA== X-Google-Smtp-Source: AGHT+IGweoLET5YnyZ2EKzJERfarS6dgnQ6cYugjO07yPKpn2IvtkOU/1jaFMgk4W8d4nO0djWxJzA== X-Received: by 2002:a17:90b:51c8:b0:340:bb64:c5e with SMTP id 98e67ed59e1d1-34e9212a206mr8487470a91.14.1766364555876; 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 Precedence: bulk X-Mailing-List: linux-kernel@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. 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