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[2003:cb:c707:4d00:6ac5:30d:1611:918f]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43d82dede5csm212272835e9.8.2025.04.01.12.08.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Apr 2025 12:08:32 -0700 (PDT) Message-ID: <01d8cde7-0973-4303-bb5d-3d377a6862cb@redhat.com> Date: Tue, 1 Apr 2025 21:08:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 0/3] memory,x86,acpi: hotplug memory alignment advisement To: Oscar Salvador , 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, 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 References: <20250127153405.3379117-1-gourry@gourry.net> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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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. They have this granularity because ... they want to add/remove memory in 16MiB on some powerpc dlpar machines :( probe_memory_block_size() can query the hypervisor on the actual hot(un)plug size. IIRC, QEMU sets it to 256 MiB. -- Cheers, David / dhildenb