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b=NhwQOgicVtnRMij32COh15iL/XYtaJTg+PJGfCUKaU7MEkHvuGpEOv/6uFIIgEb0G Sa+RG0lJMUfC3qdEi3q2s8srb0J85P2oonslrG5B7LcXz3qO8MKWa5Y6AdBrBk6OMH Gd21rDcvDSpd7N+DxBKe6fl98EMQuUlfjsABQ+eKMiq80xjmKRZbTB7mMK0JrZzw3J IrCfFkR8Y8a1yVcchETCK7Wq9tEmIRGyvMjDH3wbiy4HnLd9CVTdH89NboT2+u6DbN 9ng6qMagu6839IQimZObhHbSqKk5OtZopLcwUE8jsoKpIyVDmfEuWXo7EOh0g3awqX 3ehZ0CG53S66Q== Message-ID: <84f0811c-f04c-424e-b6fd-22e102c6b76e@kernel.org> Date: Tue, 12 May 2026 08:07:01 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 05/12] mm, swap: unify large folio allocation To: Kairui Song Cc: linux-mm@kvack.org, Andrew Morton , Zi Yan , Baolin Wang , Barry Song , Hugh Dickins , Chris Li , Kemeng Shi , Nhat Pham , Baoquan He , Johannes Weiner , Youngjun Park , Chengming Zhou , Roman Gushchin , Shakeel Butt , Muchun Song , Qi Zheng , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Yosry Ahmed , Lorenzo Stoakes , Dev Jain , Lance Yang , Michal Hocko , Michal Hocko , Suren Baghdasaryan , Axel Rasmussen References: <20260421-swap-table-p4-v3-0-2f23759a76bc@tencent.com> <20260421-swap-table-p4-v3-5-2f23759a76bc@tencent.com> <675e9027-9fb5-47b5-9a2d-c9a416a27d0d@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: DDDAD2000B X-Rspamd-Server: rspam04 X-Stat-Signature: mnx7ofnsmk49bfr7byd7h6dptgsu5gjx X-HE-Tag: 1778566029-90048 X-HE-Meta: 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 EPlZuFuw oC/Tg7Q7fMNF+GoPsmUPWDUIrGKRpmXhH/w/vy6c0w0l0U7Xj3zTuFxACPRxp70jZJYTF0bqhWQg6rJ/xzz36wClvjhDKrUH63eoHGeRrfX+8N8td0oH3jfFMxrp5LNfnGWGt8MDuO7JEo1vR8mMwQs2BC3XSkxLuBL2lc0p98bpYebsdIUWGCqHdGdbT9hbcNNn0lrINnQbvya5HFj0mpWlaZE0Cvk7g3mLxLgFxUJwPw7tWC8y0jQsUtmCGzmXrPBool6UxntD2N8i/fTgcIIswskYufVRfBM6xxmZVeNQ9+D2PibHbraKAVdcGBjcvmmE3iSD0pxXwBwCy7fkVWCtpI2ufwoKprMlR Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 5/11/26 18:44, Kairui Song wrote: > On Mon, May 11, 2026 at 11:15 PM David Hildenbrand (Arm) > wrote: >> >> On 5/11/26 16:37, Kairui Song wrote: >>> >>> Yes, the current status is a bit odd, about two years ago I also >>> wanted to name it `swapin_direct()`. >>> https://lore.kernel.org/linux-mm/20240326185032.72159-3-ryncsn@gmail.com/ >>> >>> But actually ZRAM or shmem would also benefit from supporting unified >>> readahead like this: >>> https://lore.kernel.org/linux-mm/20240102175338.62012-6-ryncsn@gmail.com/ >>> >>> So calling it `swapin_entry` seems more future-proof. At some point in >>> the future we might remove `swapin_readahead`. All swapin operations >>> could have a unified or at least a per-device readahead policy like >>> the one in the link above, instead of the current policy where the >>> caller must decide whether to perform readahead. >>> >>> But any suggestion on naming is welcome :) >> >> The other proposal >> >> https://lore.kernel.org/all/tencent_CD11FE9B4A0B362E95E776C5F679598FAA07@qq.com/ >> >> calls it >> >> swapin_synchronous_folio >> >> Maybe just swapin_sync_io()/swapin_sync() or sth like that? > > Good idea, I can keep the swapin_sync name at this point. Sync io flag > still may remain for a longer time. BTW, I was also wondering whether the whole sync vs. readahead part could simply be handled in a function called "swapin". moving that completely out of memory.c :) Probably something for another cleanup. -- Cheers, David