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b=XGx0mk71MoGFUASSSl3buSS7F0314DQL/VMMD/k7pfr9trKWTQrllQ2sXVdh3aYOY ANPzhJJsj5R2ZhQEM9A6l9eGujarHVCxjQnq8oP5RZvga5BcuuxDrJQKZOd1Mxr/56 P5FDaT6+OZ4qMSnP1GIsKRaNbewajq8aLlOXUWkrLAuiMYfd2OYbF24M+AtHrNVDrL BN3hcEPLsHV4FLsQ3p8EnCV6n9+yoofM01oDHVmcU/LrS3CZ47xVKbERnEShMuKdVw cTT2MFiDf71KrPOBRT3r1Lx8wIpztwbzWzVjAIre6N0ydk0o2ZN9DjwUB4IkHiFONw NNDs2qsYd47zg== Message-ID: Date: Fri, 26 Jun 2026 16:58:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 01/16] set_memory: set_direct_map_* to take address To: Brendan Jackman , Lorenzo Stoakes , "Kalyazin, Nikita" Cc: "kvm@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-mm@kvack.org" , "bpf@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , "kernel@xen0n.name" , "linux-riscv@lists.infradead.org" , "pbonzini@redhat.com" , "corbet@lwn.net" , "maz@kernel.org" , "oupton@kernel.org" , "suzuki.poulose@arm.com" , "yuzenghui@huawei.com" , "will@kernel.org" , "seanjc@google.com" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "hpa@zytor.com" , "luto@kernel.org" , "willy@infradead.org" , "akpm@linux-foundation.org" , "lorenzo.stoakes@oracle.com" , "vbabka@kernel.org" , "rppt@kernel.org" , "surenb@google.com" , "mhocko@suse.com" , "ast@kernel.org" , "daniel@iogearbox.net" , "andrii@kernel.org" , "martin.lau@linux.dev" , "eddyz87@gmail.com" , "song@kernel.org" , "yonghong.song@linux.dev" , "john.fastabend@gmail.com" , "kpsingh@kernel.org" , "haoluo@google.com" , "jolsa@kernel.org" , "jhubbard@nvidia.com" , "jannh@google.com" , "pfalcato@suse.de" , "skhan@linuxfoundation.org" , "riel@surriel.com" , "ryan.roberts@arm.com" , "jgross@suse.com" , "yu-cheng.yu@intel.com" , "kas@kernel.org" , "coxu@redhat.com" , "ackerleytng@google.com" , "yosry@kernel.org" , "ajones@ventanamicro.com" , "maobibo@loongson.cn" , "prsampat@amd.com" , "wu.fei9@sanechips.com.cn" , "mlevitsk@redhat.com" , "jthoughton@google.com" , "agordeev@linux.ibm.com" , "alex@ghiti.fr" , "aou@eecs.berkeley.edu" , "borntraeger@linux.ibm.com" , "chenhuacai@kernel.org" , "baolu.lu@linux.intel.com" , "dev.jain@arm.com" , "gor@linux.ibm.com" , "hca@linux.ibm.com" , "palmer@dabbelt.com" , "pjw@kernel.org" , "shijie@os.amperecomputing.com" , "svens@linux.ibm.com" , "thuth@redhat.com" , "Liam.Howlett@oracle.com" , "urezki@gmail.com" , "zhengqi.arch@bytedance.com" , "pavel@kernel.org" , "yangyicong@hisilicon.com" , "vannapurve@google.com" , "jackmanb@google.com" , "patrick.roy@linux.dev" , "Thomson, Jack" , "Itazuri, Takahiro" , "Manwaring, Derek" References: <20260410151746.61150-1-kalyazin@amazon.com> <20260410151746.61150-2-kalyazin@amazon.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 2852D14000F X-Rspam-User: X-Stat-Signature: a7nazfd7u8ddk3g3uc4ueoy8zs5hm73q X-HE-Tag: 1782485922-473456 X-HE-Meta: U2FsdGVkX1/W2XkqakqQ5QKpsi8vlXchVwIGnJqVdHC4VmFkRvOskxRhro7ofY4R8W1dr17cF3ykPv0h9XVF2HcxTDerYZKzL9C8WzyawP1F730xGtg2rDUILSYWENyNRgfbPFKcHNID9g1/haDB22VQTDVQDKjKPR27G5p0SH4RJtFiMhJ0CKslUstO6A+N4Xuk2C4xiGu6geQwK8nKKLe2JABQbZrkEoz7QosecW/fxeisKYoDO9Noon3/UD/CQDoU5ad9bhkWnEdAltEg8Xy7h5Jbe5C1wcbYOeGayOAYAZ2JE9Awuas34Mexw5y+AmCARlLyicKVWZmY1hKew1t+asCkgChpCvE3NE2ffIy6jb24lAFFvimfd+sOunFqZ4O/n+vEesB3wvx0otgcv3vXIihYxnPNAihjzJ7PFgbcmd3JD6I8rzPKnkaDPy0IyDpToRZBR5dTKnQCAV6PrI/pYnLhAIH4NtW4/GX2dev26TvpYMynhu+IT5KgxWoJ+GK0CN9V/ieWtms1UOj8o8/F0ovqNgpKDUwuF/mPOx1NU3I4fx14Hiw4aWqr9GJaeLS8AFGXRdvO2N1I3gENzK3pWtys/K/+rc5sfWlDpftBeLAO1DzDYPHZh9nym7bxMxSkpaixTIWBe2jWzXDZ8MCw+psG5s3UfziPFv80mn0nJou2dZpSF74URdn1g8Sym5yFjk/POl0Yk2RDgb8VB/nT7Mt5uPTNcMIQl/mDbeYpPAv0oGnskE9t9uaq/451GXLaKRf27taM8szYnUOvZ9oMfMv7PcFaJI/p37FB7f3DFAEAc/4vV3aa3K3jgZdqGQPx0ELObxRf+miR934hgytDzq+0SXWc6yBsfbLAKa37O/SZv7iipsxbjhVgc0amp6iV2kBuim3F8A2ugiTgNX3/5rXovoYZ1bhN0aILOvGpaQz3ojLrS+Lk5yZC9KZB1A6nEou9XSmIPNf04K8 KeK2A7pC RQnR2Vw0rnrrXC3HxMYEhQI4r7SBwZBXxpnhwrBFHIDsj8/IfBr0ufVvUXvabpbgjZYNQpUDfcTtiU/CPSRmWXMOUTwdg0znda6oDoQvzfjLcRdm8Ox3f+0oZmEi1wgmbG6QiT2ETiCbT7UPrgoZWJjXh/wAqgrXxSDsIFJvfVjU5XoT9f7xmJm5TqG3CRytIV2CRr7ZWYnA5ucA7EiOXEZr+jOS+wiTNz9hMyFe7RnOZ29VIprPclE79kjueHtJ6NOibrvOF//uHcCbc4+8TAI2ZICP7XgnjNganLvmDaL3nm4YqUUjuxmAtikg9FGV329nOSTcEFnD2pXJVvr1uQL9Ponq0LoCRTpYx8GCgORHevlUv+BYpNpRtH0k+OehCtmkGnxqb9hJsAuACD3JytExb2/za7oYyRkssbqqiY8vTxXUD8LP1nXpTNY99CGda/OWr7dYZpwqkr63MtiLInyjCe0fSDaVJhBeu Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 6/26/26 16:38, Brendan Jackman wrote: > On Tue Apr 21, 2026 at 2:43 PM UTC, Lorenzo Stoakes wrote: >> On Fri, Apr 10, 2026 at 03:17:58PM +0000, Kalyazin, Nikita wrote: >>> From: Nikita Kalyazin >>> >>> Let's convert set_direct_map_*() to take an address instead of a page to >>> prepare for adding helpers that operate on folios; it will be more >>> efficient to convert from a folio directly to an address without going >>> through a page first. > > Why is this more efficient? Isn't it a purely compile-time conversion? > > Indeed in the current implementation folio_address() is > page_address(&folio->page) so it still goes through a page anyway, no? > > I might be missing context here about how this will look in the > memdesc future. Good question. page_address() is really only complicated for highmem. For non-highmem stuff it's simply derived from the page pfn. I suspect going page -> pfn will remain as efficient as it currently is (with vmemmap). For odd cases (SPARSEMEM without VMEMMAP) going through folio->pfn [1] might be slighty faster. [1] https://kernelnewbies.org/MatthewWilcox/Memdescs/Path -- Cheers, David