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[173.79.56.208]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4751db4fe33sm24424631cf.78.2025.03.07.13.55.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 07 Mar 2025 13:55:41 -0800 (PST) Date: Fri, 7 Mar 2025 16:55:40 -0500 From: Gregory Price To: Rakie Kim Cc: akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org, joshua.hahnjy@gmail.com, dan.j.williams@intel.com, ying.huang@linux.alibaba.com, kernel_team@skhynix.com, honggyu.kim@sk.com, yunjeong.mun@sk.com Subject: Re: [PATCH 0/4] mm/mempolicy: Add memory hotplug support in weighted interleave Message-ID: References: <20250307063534.540-1-rakie.kim@sk.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Queue-Id: 9A08DA0014 X-Stat-Signature: hocg3g8r4q6z8pjowhzkqem9f67gcqya X-Rspamd-Server: rspam10 X-HE-Tag: 1741384543-409240 X-HE-Meta: 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 +mYBJjoh r+89Dl2ii7YilvyfU/Wv7ygJoRuZGOLL7HEpmp0SFV1fE7k05Rwi3nCQ3jZkgpEdaQEJvOXZOcZtg0SZqvbGniIXxAC6zRx2bXuUigD4k1EJaSHIHz+ZlBSPpiBvtHdmZx/OXByFgT3zJTvMCz/VEPfghUH4gyz10Ax7YgyRPnxS3lI5DY7toIeaO8QfVPtmm9rzb6LZqorabX0/phNrUkuMU3qiFL3OW+ibXoUWwkHz0Izw6veLE81QaKNzwNQmJgNg6H22ddHJ2ZvMn0WFvPFkuIAHusGameY5W+ke7vjzNUMKTtP7v3q5xu/T/WybG2tjz3ZeX+v4TvY7nB8DfGCpeIM+8/BbNHawOLX0MbfCjfoSEMk/Edr688b12H/BPae/WKrR7PQCcoPTgQvBUyM0uSQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.035644, 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 Fri, Mar 07, 2025 at 10:56:04AM -0500, Gregory Price wrote: > > I think the underlying issue you're dealing with is that the system is > creating more nodes for you than it should. > Looking into this for other reasons, I think you are right that multiple numa nodes can exist that cover the same memory - just different regions. I can see why you would want to hide the nodes that don't actively have memory online, but i still have concerns for nodes that may come and go and hiding this configuration from the user until memory arrives. An example would be a DCD device where a node could add or remove memory at any time. If you removed the last block of memory, the node would disappear - but the block could come back at any time. That seems problematic, as you might want to manage that node while no memory is present. ~Gregory