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[91.12.97.149]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38f259d5c36sm21652394f8f.67.2025.02.20.11.26.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 20 Feb 2025 11:26:23 -0800 (PST) Message-ID: <4ae838ee-b079-408e-8799-e9530ca50417@redhat.com> Date: Thu, 20 Feb 2025 20:26:21 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: CXL Boot to Bash - Section 3: Memory (block) Hotplug To: Gregory Price , Yang Shi Cc: lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org, linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org References: <1b4c6442-a2b0-4290-8b89-c7b82a66d358@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: wB8aZVxcda3rYDZQXTz_ogNs2ZDxqWiLGHuuogfoLEU_1740079585 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 5E6EF180016 X-Stat-Signature: s66b1m8wojmiwcrr91pzfw196kyncawq X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1740079588-862513 X-HE-Meta: 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 Poore5dP 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 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 20.02.25 19:43, Gregory Price wrote: > On Thu, Feb 20, 2025 at 09:50:07AM -0800, Yang Shi wrote: >>>> I will double check that this isn't working as expected, and i'll double >>>> check for a build option as well. >>>> >>>> stupid question - it sorta seems like you'd want this as the default >>>> setting for driver-managed hotplug memory blocks, but I suppose for >>>> very small blocks there's problems (as described in the docs). >>> >>> The issue is that it is per-memblock. So you'll never have 1 GiB ranges >>> of consecutive usable memory (e.g., 1 GiB hugetlb page). >> >> Regardless of ZONE_MOVABLE or ZONE_NORMAL, right? >> >> Thanks, >> Yang > > From my testing, yes. Yes, the only way to get some 1 GiB pages is by using larger memory blocks (e.g., 2 GiB on x86-64), which comes with a different set of issues (esp. hotplug granularity). Of course, only 1x usable 1 GiB page for each 2 GiB block. There were ideas in how to optimize that (e.g., requiring a new sysfs interface to expose variable-sized blocks), if anybody is interested, please reach out. -- Cheers, David / dhildenb