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Fri, 02 May 2025 08:36:44 +0000 From: Oscar Salvador To: Andrew Morton Cc: David Hildenbrand , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vlastimil Babka , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Jonathan Cameron , Rakie Kim , Oscar Salvador Subject: [PATCH v3 0/3] Implement numa node notifier Date: Fri, 2 May 2025 10:36:21 +0200 Message-ID: <20250502083624.49849-1-osalvador@suse.de> X-Mailer: git-send-email 2.49.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Action: no action X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 17D974000A X-Stat-Signature: 5i4cr4j1j6kgjs6ibtkfmdk1qgfoy4a4 X-HE-Tag: 1746175006-127062 X-HE-Meta: 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 cofKumfh ucv2r19F1080dBD0kvH0mnZVlfQwMX/M1NLTO3wHh8BSO8/eK3CdqtcYseQ== 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: v2 -> v3: - Add Suggested-by (David) - Replace last N_NORMAL_MEMORY mention in slub (David) - Replace the notifier for autoweitght-mempolicy - Fix build on !CONFIG_MEMORY_HOTPLUG v1 -> v2: - Remove status_change_nid_normal and the code that deals with it (David & Vlastimil) - Remove slab_mem_offline_callback (David & Vlastimil) - Change the order of canceling the notifiers in {online,offline}_pages (Vlastimil) - Fix up a couple of whitespaces (Jonathan Cameron) - Add RBs-by Memory notifier is a tool that allow consumers to get notified whenever memory gets onlined or offlined in the system. Currently, there are 10 consumers of that, but 5 out of those 10 consumers are only interested in getting notifications when a numa node changes its memory state. That means going from memoryless to memory-aware of vice versa. Which means that for every {online,offline}_pages operation they get notified even though the numa node might not have changed its state. While we are doing this, remove status_change_nid_normal, as the only current user (slub) does not really need it. This allows us to further simplify and clean up the code. The first patch gets rid of status_change_nid_normal in slub. The second patch implements a numa node notifier that does just that, and have those consumers register in there, so they get notified only when they are interested. The third patch replaces 'status_change_nid{_normal}' fields within memory_notify with a 'nid', as that is only what we need for memory notifer and update the only user of it (page_ext). Consumers that are only interested in numa node states change are: - memory-tier - slub - cpuset - hmat - cxl - autoweight-mempolicy Oscar Salvador (3): mm,slub: Do not special case N_NORMAL nodes for slab_nodes mm,memory_hotplug: Implement numa node notifier mm,memory_hotplug: Rename status_change_nid parameter in memory_notify drivers/acpi/numa/hmat.c | 6 +- drivers/base/node.c | 21 +++++++ drivers/cxl/core/region.c | 14 ++--- drivers/cxl/cxl.h | 4 +- include/linux/memory.h | 38 ++++++++++++- kernel/cgroup/cpuset.c | 2 +- mm/memory-tiers.c | 8 +-- mm/memory_hotplug.c | 117 +++++++++++++++++++++----------------- mm/mempolicy.c | 8 +-- mm/page_ext.c | 12 +--- mm/slub.c | 45 +++------------ 11 files changed, 153 insertions(+), 122 deletions(-) -- 2.49.0