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Tue, 1 Apr 2025 18:53:49 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id XGLpBz027GcPOAAAD6G6ig (envelope-from ); Tue, 01 Apr 2025 18:53:49 +0000 Date: Tue, 1 Apr 2025 20:53:47 +0200 From: Oscar Salvador To: Gregory Price Cc: linux-mm@kvack.org, linux-acpi@vger.kernel.org, kernel-team@meta.com, x86@kernel.org, linux-kernel@vger.kernel.org, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, rafael@kernel.org, lenb@kernel.org, david@redhat.com, gregkh@linuxfoundation.org, akpm@linux-foundation.org, dan.j.williams@intel.com, Jonathan.Cameron@huawei.com, alison.schofield@intel.com, rrichter@amd.com, rppt@kernel.org, bfaccini@nvidia.com, haibo1.xu@intel.com, dave.jiang@intel.com, Ira Weiny , Fan Ni Subject: Re: [PATCH v8 0/3] memory,x86,acpi: hotplug memory alignment advisement Message-ID: References: <20250127153405.3379117-1-gourry@gourry.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250127153405.3379117-1-gourry@gourry.net> X-Rspamd-Queue-Id: CC5DFC0005 X-Rspamd-Server: rspam05 X-Rspam-User: X-Stat-Signature: qdue19pqi61t5hh1ycb39a8g9g3mb1y5 X-HE-Tag: 1743533631-953260 X-HE-Meta: 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 UaJKSpKE qHkzZBrtsmGljk0uU7Xezl68JTMAZu1H7b+Rah37rKClpWh5V3904Sb+BJvilXTXiiynOGpRW25VMV94cYsI1ZVgkWEReAdTn0M4RbgIxilxWKQbG6Ma6z48hcdk7ZP1Wv+HKvDFh7DJSsMpQjgf5s4AKIdRCg5oH/e+BQuVo4om69p76Lf6Bg3QbLY5uTfmSmfaPfbir4OkwPHA7TTTouhWm4P+6y6iG0gQzLOQzGR9sDLbR4CbHPWKaAuma9Vf+U0XVZR+FU0UpVsg= 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 Mon, Jan 27, 2025 at 10:34:02AM -0500, Gregory Price wrote: > v8: nits and tag pickups > > When physical address regions are not aligned to memory block size, > the misaligned portion is lost (stranded capacity). > > Block size (min/max/selected) is architecture defined. Most architectures > tend to use the minimum block size or some simplistic heurist. On x86, > memory block size increases up to 2GB, and is otherwise fitted to the > alignment of non-hotplug (i.e. not special purpose memory). I wonder if something like this could help us in improving the ridiculous situation of having 16MB memory-block size on powerpc. -- Oscar Salvador SUSE Labs