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[80.187.83.189]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4255d8e9719sm31915894f8f.31.2025.10.08.12.52.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 08 Oct 2025 12:52:23 -0700 (PDT) Message-ID: <1763f0d9-37fc-4c3e-b31b-2cfac33d5c95@redhat.com> Date: Wed, 8 Oct 2025 21:52:09 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] Revert "mm, hugetlb: remove hugepages_treat_as_movable sysctl" To: Gregory Price Cc: linux-mm@kvack.org, corbet@lwn.net, muchun.song@linux.dev, osalvador@suse.de, akpm@linux-foundation.org, hannes@cmpxchg.org, laoar.shao@gmail.com, brauner@kernel.org, mclapinski@google.com, joel.granados@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Mel Gorman , Michal Hocko , Alexandru Moise <00moses.alexander00@gmail.com>, David Rientjes References: <20251007214412.3832340-1-gourry@gourry.net> <402170e6-c49f-4d28-a010-eb253fc2f923@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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: R_MnkWkSJAKmagUgev8PFnYFS0oywISl1WuZ5sqgDGw_1759953146 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Stat-Signature: tmxnx4gb3atakafo133bjxa7k6jqdhbq X-Rspam-User: X-Rspamd-Queue-Id: F25018000F X-HE-Tag: 1759953148-353280 X-HE-Meta: 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 3CLuNxul 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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 08.10.25 21:44, Gregory Price wrote: > On Wed, Oct 08, 2025 at 09:01:09PM +0200, David Hildenbrand wrote: >>> >>> fwiw this works cleanly. Just dropping this here, but should continue >>> the zone conversation. I need to check, but does this actually allow >>> pinnable allocations? I thought pinning kicked off migration. >> >> Yes, it should because longterm pinning -> unmovable. >> > > You know i just realized, my test here only works before I allocated 1GB > pages on both node0 and node1. If I only allocate 1gb hugetlb on node1, > then the migrate pages call fails - because there are no 1gb pages > available there. > > I imagine this would cause hot-unplug/offline to fail since it uses the > same migration mechanisms. > > Worse I would imagine this would fail for 2MB. > > Seems like the 1GB limitation is arbitrary if 2MB causes the same issue. Yeah, with hugetlb allocations there are no guarantees either. It's just that page compaction / defragmentation makes it much less likely to fail in many scenarios. -- Cheers David / dhildenb