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Mon, 08 Dec 2025 01:41:24 -0800 (PST) Received: from localhost.localdomain ([240f:34:212d:1:e251:d9f:c2ef:caf4]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-bf6a36bbc60sm11675279a12.36.2025.12.08.01.41.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Dec 2025 01:41:24 -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 1/2] mm: memory-tiers, numa_emu: enable to create memory tiers using fake numa nodes Date: Mon, 8 Dec 2025 18:40:27 +0900 Message-ID: <20251208094028.214949-2-akinobu.mita@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251208094028.214949-1-akinobu.mita@gmail.com> References: <20251208094028.214949-1-akinobu.mita@gmail.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This makes it possible to create memory tiers using fake numa nodes generated by numa emulation. The new "numa_emulation.adistance" kernel parameter allows you to set the abstract distance for each NUMA node. For example, if the system is booted with the parameters "numa=fake=2 numa_emulation.adistance=576,704", it will configure memory tiers with node0 having the default DRAM adistance value and node1 having a lower adistance value. Signed-off-by: Akinobu Mita --- mm/numa_emulation.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/mm/numa_emulation.c b/mm/numa_emulation.c index 703c8fa05048..a4266da21344 100644 --- a/mm/numa_emulation.c +++ b/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 *dfl_phys_nid) 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_meminfo *numa_meminfo, int numa_dist_cnt) } } + register_mt_adistance_algorithm(&emu_adist_nb); + /* free the copied physical distance table */ memblock_free(phys_dist, phys_size); return; -- 2.43.0