From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AE1002367BA for ; Tue, 23 Dec 2025 01:42:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766454167; cv=none; b=fe9Wu8E53m3xJUwh8kFpIM0c/lJOFNTNvdyeBFQAvn33Bthttcp+0TljDFLdnBfKrEorThaACg4gMym7YokoSg5tJUDLXFeaXQMzrUNB2/YbmDt7g2KnK9QmsFbSEA4JrxBm6ezPJWuGqV4ssW6aXl/DSILnCT4Gobctppo4JZo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766454167; c=relaxed/simple; bh=nIUeUn838avVDvHuL3/5IHlBB3eZso9rTLOewCJoivY=; h=Date:To:From:Subject:Message-Id; b=gr6lJ6H7YFEqxz4rMjDdULScOAQvkCOHwEsjazVnUOHYeB/M3UmbczhtU04g8lXMAFcWQhXzUxP+btp1HII15aAqAZHv053paTMRHqdIc6i8fWGMDcRdZMJYp/2hSOQXHhp1lGdyqX1DMkZeRDlJicqkd5RR+YAjXroEs6RIqsM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=2MQ5usXm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="2MQ5usXm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 227E7C116C6; Tue, 23 Dec 2025 01:42:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1766454167; bh=nIUeUn838avVDvHuL3/5IHlBB3eZso9rTLOewCJoivY=; h=Date:To:From:Subject:From; b=2MQ5usXmJX2y0Zcfv5WLHSwtJEAlzWyBXHu18eMwLkKWhTGV0qVtzqMbhmZEeSzB8 TVCEx/wx31NSP5eSqsxuUbgSWNwt57t2KjhmIlq31OINX6lrajpDHmJ1l2xctEogoL VbQTJX+H6ntJzkP9GxsI5Ifp4JQkz4ybodVcJEps= Date: Mon, 22 Dec 2025 17:42:46 -0800 To: mm-commits@vger.kernel.org,zhengqi.arch@bytedance.com,yuanchu@google.com,weixugc@google.com,vbabka@suse.cz,surenb@google.com,shakeel.butt@linux.dev,rppt@kernel.org,rientjes@google.com,mhocko@kernel.org,lorenzo.stoakes@oracle.com,liam.howlett@oracle.com,hannes@cmpxchg.org,david@kernel.org,axelrasmussen@google.com,akinobu.mita@gmail.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-memory-tiers-numa_emu-enable-to-create-memory-tiers-using-fake-numa-nodes.patch added to mm-new branch Message-Id: <20251223014247.227E7C116C6@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: memory-tiers, numa_emu: enable to create memory tiers using fake numa nodes has been added to the -mm mm-new branch. Its filename is mm-memory-tiers-numa_emu-enable-to-create-memory-tiers-using-fake-numa-nodes.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memory-tiers-numa_emu-enable-to-create-memory-tiers-using-fake-numa-nodes.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Akinobu Mita Subject: mm: memory-tiers, numa_emu: enable to create memory tiers using fake numa nodes Date: Mon, 22 Dec 2025 09:48:32 +0900 Patch series "mm: fix oom-killer not being invoked when demotion is enabled", v2. 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. This patch (of 3): This makes it possible to create memory tiers using fake numa nodes generated by numa emulation. The "numa_emulation.adistance=" kernel cmdline option allows you to set the abstract distance for each NUMA node. For example, you can create two fake nodes, each in a different memory tier by booting with "numa=fake=2 numa_emulation.adistance=576,704". Here, the abstract distances of node0 and node1 are set to 576 and 706, respectively. Each memory tier covers an abstract distance chunk size of 128. Thus, nodes with abstract distances between 512 and 639 are classified into the same memory tier, and nodes with abstract distances between 640 and 767 are classified into the next slower memory tier. The abstract distance of fake nodes not specified in the parameter will be the default DRAM abstract distance of 576. Link: https://lkml.kernel.org/r/20251222004834.10539-1-akinobu.mita@gmail.com Link: https://lkml.kernel.org/r/20251222004834.10539-2-akinobu.mita@gmail.com Signed-off-by: Akinobu Mita Cc: Axel Rasmussen Cc: "David Hildenbrand (Red Hat)" Cc: David Rientjes Cc: Johannes Weiner Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Qi Zheng Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: Vlastimil Babka Cc: Wei Xu Cc: Yuanchu Xie Signed-off-by: Andrew Morton --- mm/numa_emulation.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) --- a/mm/numa_emulation.c~mm-memory-tiers-numa_emu-enable-to-create-memory-tiers-using-fake-numa-nodes +++ a/mm/numa_emulation.c @@ -6,6 +6,9 @@ #include #include #include +#include +#include +#include #include #include #include @@ -344,6 +347,27 @@ static int __init setup_emu2phys_nid(int return max_emu_nid; } +static int adistance[MAX_NUMNODES]; +module_param_array(adistance, int, NULL, 0400); +MODULE_PARM_DESC(adistance, "Abstract distance values for each NUMA node"); + +static int emu_calculate_adistance(struct notifier_block *self, + unsigned long nid, void *data) +{ + if (adistance[nid]) { + int *adist = data; + + *adist = adistance[nid]; + return NOTIFY_STOP; + } + return NOTIFY_OK; +} + +static struct notifier_block emu_adist_nb = { + .notifier_call = emu_calculate_adistance, + .priority = INT_MIN, +}; + /** * numa_emulation - Emulate NUMA nodes * @numa_meminfo: NUMA configuration to massage @@ -532,6 +556,8 @@ void __init numa_emulation(struct numa_m } } + register_mt_adistance_algorithm(&emu_adist_nb); + /* free the copied physical distance table */ memblock_free(phys_dist, phys_size); return; _ Patches currently in -mm which might be from akinobu.mita@gmail.com are mm-damon-vaddr-fix-missing-pte_unmap_unlock-in-damos_va_migrate_pmd_entry.patch mm-memory-tiers-numa_emu-enable-to-create-memory-tiers-using-fake-numa-nodes.patch mm-numa_emu-add-document-for-numa-emulation.patch mm-vmscan-dont-demote-if-there-is-not-enough-free-memory-in-the-lower-memory-tier.patch