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Received: from DESKTOP-5N7EMDA(mailfrom:ying.huang@linux.alibaba.com fp:SMTPD_---0X2oYqmQ_1778550348 cluster:ay36) by smtp.aliyun-inc.com; Tue, 12 May 2026 09:46:37 +0800 From: "Huang, Ying" To: "David Hildenbrand (Arm)" Cc: Shivank Garg , akpm@linux-foundation.org, kinseyho@google.com, weixugc@google.com, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, willy@infradead.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, apopple@nvidia.com, dave@stgolabs.net, Jonathan.Cameron@huawei.com, rkodsara@amd.com, vkoul@kernel.org, bharata@amd.com, sj@kernel.org, rientjes@google.com, xuezhengchu@huawei.com, yiannis@zptcorp.com, dave.hansen@intel.com, hannes@cmpxchg.org, jhubbard@nvidia.com, peterx@redhat.com, riel@surriel.com, shakeel.butt@linux.dev, stalexan@redhat.com, tj@kernel.org, nifan.cxl@gmail.com, jic23@kernel.org, aneesh.kumar@kernel.org, nathan.lynch@amd.com, Frank.li@nxp.com, djbw@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 0/7] Accelerate page migration with batch copying and hardware offload In-Reply-To: <088ded16-09ca-4c40-ab23-62108c342588@kernel.org> (David Hildenbrand's message of "Mon, 11 May 2026 17:19:18 +0200") References: <20260428155043.39251-2-shivankg@amd.com> <87a4ub35ja.fsf@DESKTOP-5N7EMDA> <088ded16-09ca-4c40-ab23-62108c342588@kernel.org> Date: Tue, 12 May 2026 09:45:48 +0800 Message-ID: <87ecjhwgc3.fsf@DESKTOP-5N7EMDA> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=ascii X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 91B75C0005 X-Stat-Signature: 5xwe3u7dteu74mj5gaw3oskp8ukadfoa X-HE-Tag: 1778550404-857450 X-HE-Meta: U2FsdGVkX1/lHw9inZMLVDEkdFCcPWmsRafgtoIIWgsNHZdY710/P8RgF8HxNTTy/qcVYkj0AOdpU2Kw2hTykcsKRQgyYCvR0rdf5cscyjUfQ+Q8drhPHIt83Z4BV/kyfXDzXtHfftzvScQXdjwYn3P81Jr8JNRpv9K9NTtwcYKdSg1SBbDSCxTkvOfnahrpdya957Q1hojMAbu7s7cmgEurib6giftS7K8/FphtqfM/hmM75RGRS1DAM5tfKsCkcpjol1ORsSShlWI9Wxxu3H1I9JdhCRRhWEfLPuEsTEFfcraPb8dZ4lEj0g/PzM9D5u1ALjd1k2VEa+cHNnQ9xfN4py92lAhSTQfVXIlf1jROwvG6GmAyz+kzygOYhi1CYLXt9oPzL49cEVuwJg4145txwl3k5688g1mcQNohTXX1OHXWi/uojt5EALV0H3L7JqODbW8/Ek6nmpdoVdXYFdqCpC43zjBcXjkTg0FTmcppU7pIRE5kifg4NBYtA8chrrGIAdpB7wv3rT1Wekbw3UKgaWZrRv+stsumFyW66oKgHoiKMzVwFVA5jUs7vrLfg/uMhtyta4aeXMA6xDBCpIUn64auf7yrWdvo/9bRJOkIN//rHqM724DNPyW+fCtJ69PJEVbennGdtbyLYeC/Md981ryoviQZOaOgAgY9zcsI+je9NjwxvqavJNWRm/KzkeA5DO1fGTq65io93BQiTtWwBXX14yIqw3dwSw3Lzhc2VUq2U17SsYbsQj+HPSA64i/HbCq3srlLMAoNdcKmYSy1JozD9axFxWlxNPaT9bb6BY4xOIhzFMtHsFeNXUdHw+9U+ELVaF4zIZeXSr9ia4sDl89bn6tDhhwnrLwSo0XYPhh9zJQoSbIMaaGthEXwqqudH5Frork2DiMKPcvwmn4nZGONrL4YPsZmOOvIMvbTmUhfxc3W6qGOhRwwkYsB0evKEE3Kc8/KsZN5rk8 NE5y8vaT p4CNfNqi0geM3z4b1aTs+F6+cP1EhdHavcSwtSBLYZ79ELPd50cuXeI8b8wIBMWE8AAbnf67DySHIthykHlkoLRmtpbTU8qcx8NM0zzhmRkpN8GoSIWCfLPaSn8gQ0lyHp1XjHR2Wsjse+cOZG74Tj93hc/uW/BdGd4BHRGt2pUsbbYh38vxEQVbABNpf571cBhrtgUk3JZwlk3+jHKhjr2vaUXcI9Yx/X8R1GoTEmsJVHTxnJlZM6nPjrehdWrxCeX1J1UgKO9oMBAqx4/3qbjWIuWddjlQL7XT9X9XxY6uj0/T5SVFR9w7L1QENR2y1jZRcSWFsmwVMseNM7ujMufJHIPujZml6r+/K Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: "David Hildenbrand (Arm)" writes: >>> --------------- >>> >>> 1. Should the batch path run without a registered migrator? Patches 1-4 >>> are self-contained and use folios_mc_copy() (CPU). I have several >>> options like making batch path always-on for eligible folios, or >>> giving admin an option to flip the static branch, or keep the gate. >>> I'm leaning toward always-on. >>> >>> 2. Carrying already_copied via folio->migrate_info vs changing the >>> migrate_folio() callback signature (Huang, Ying). I went with the >>> field for now to avoid touching every fs callback before the design >>> settles. Happy to revisit. >> >> Personally, I still prefer to change migrate_folio() callbacks for >> better readability. > > Can that be added as a cleanup on top? It sounds good to me. --- Best Regards, Huang, Ying