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Thu, 3 Apr 2025 14:29:56 +0200 Date: Thu, 3 Apr 2025 13:29:54 +0100 From: Jonathan Cameron To: Oscar Salvador CC: Andrew Morton , David Hildenbrand , , , Vlastimil Babka , Hyeonggon Yoo <42.hyeyoo@gmail.com>, , Dan Williams , Subject: Re: [PATCH 0/2] Implement numa node notifier Message-ID: <20250403132954.0000779f@huawei.com> In-Reply-To: <20250401092716.537512-1-osalvador@suse.de> References: <20250401092716.537512-1-osalvador@suse.de> X-Mailer: Claws Mail 4.3.0 (GTK 3.24.42; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.203.177.66] X-ClientProxiedBy: lhrpeml100006.china.huawei.com (7.191.160.224) To frapeml500008.china.huawei.com (7.182.85.71) X-Stat-Signature: fm5uuskb95p51oiopzw54q3mrc7qsty8 X-Rspam-User: X-Rspamd-Queue-Id: 09917180011 X-Rspamd-Server: rspam08 X-HE-Tag: 1743683401-195398 X-HE-Meta: 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 kJ8g6+ZB 2kNQYDeNMCD2yupaOyxZwXnpNBpGUyDYBLlgYdDM3frs6GhYc93WOfdfFSbgiA1ItgpDwU5+0upexMgPnDlrHS3tvLZttzDpRp+UgnKzJrW2To2bsuW8QwcD78BluuGkBwK370FYxiYCIq/u15RGTrcsaMgSVD8PLMyaoFayagSypmIXNu4s+E0547EhvrUbrjlHDsnrBM0Pp9hQCF07yCj8v0KQ2nEyx0AhEbIYGjlojME3umTkiZTSmRw== 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 Tue, 1 Apr 2025 11:27:14 +0200 Oscar Salvador wrote: > 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 has changed its > 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. > > The first 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 second patch replaces 'status_change_normal{_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 > Hi Oscar, Idea seems good to me. +CC linux-cxl for information of others not on the thread. > > Oscar Salvador (2): > mm,memory_hotplug: Implement numa node notifier > mm,memory_hotplug: Replace status_change_nid parameter in > memory_notify > > drivers/acpi/numa/hmat.c | 6 +-- > drivers/base/node.c | 19 +++++++++ > drivers/cxl/core/region.c | 14 +++---- > drivers/cxl/cxl.h | 4 +- > include/linux/memory.h | 37 ++++++++++++++++++ > kernel/cgroup/cpuset.c | 2 +- > mm/memory-tiers.c | 8 ++-- > mm/memory_hotplug.c | 82 +++++++++++++++++++++++++++++---------- > mm/page_ext.c | 12 +----- > mm/slub.c | 22 +++++------ > 10 files changed, 146 insertions(+), 60 deletions(-) >