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[2003:d8:2f2b:b200:607d:d3d2:3271:1be0]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b79c469582sm18505270f8f.52.2025.08.05.03.57.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Aug 2025 03:57:58 -0700 (PDT) Message-ID: <98a30c7f-8be1-4b08-955c-724667971288@redhat.com> Date: Tue, 5 Aug 2025 12:57:57 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [v2 01/11] mm/zone_device: support large zone device private folios To: Balbir Singh , linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Karol Herbst , Lyude Paul , Danilo Krummrich , David Airlie , Simona Vetter , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Shuah Khan , Barry Song , Baolin Wang , Ryan Roberts , Matthew Wilcox , Peter Xu , Zi Yan , Kefeng Wang , Jane Chu , Alistair Popple , Donet Tom , Ralph Campbell , =?UTF-8?Q?Mika_Penttil=C3=A4?= , Matthew Brost , Francois Dugast References: <20250730092139.3890844-1-balbirs@nvidia.com> <20250730092139.3890844-2-balbirs@nvidia.com> <1e307223-897c-4db0-9564-95d76bc3d260@nvidia.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: DF31920009 X-Stat-Signature: ts66ce519aopss5h9nbp69h83px4xaiq X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1754391482-368494 X-HE-Meta: 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 Sqav0OLi 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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 05.08.25 06:22, Balbir Singh wrote: > On 7/30/25 19:50, David Hildenbrand wrote: > >> I think I asked that already but maybe missed the reply: Should these folios ever be added to the deferred split queue and is there any value in splitting them under memory pressure in the shrinker? >> >> My gut feeling is "No", because the buddy cannot make use of these folios, but maybe there is an interesting case where we want that behavior? >> > > I realized I did not answer this > > deferred_split() is the default action when partial unmaps take place. Anything that does > folio_rmap_remove_ptes can cause the folio to be deferred split if it gets partially > unmapped. Right, but it's easy to exclude zone-device folios here. So the real question is: do you want to deal with deferred splits or not? If not, then just disable it right from the start. -- Cheers, David / dhildenb