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[2003:d8:2f3c:3a00:5662:26b3:3e5d:438e]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-454dd541a59sm44199145e9.32.2025.07.11.04.39.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 11 Jul 2025 04:39:28 -0700 (PDT) Message-ID: Date: Fri, 11 Jul 2025 13:39:26 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 12/14] mm: add config option for clearing page-extents To: Ankur Arora , linux-kernel@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org Cc: akpm@linux-foundation.org, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, mingo@redhat.com, mjguzik@gmail.com, luto@kernel.org, peterz@infradead.org, acme@kernel.org, namhyung@kernel.org, tglx@linutronix.de, willy@infradead.org, raghavendra.kt@amd.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com References: <20250710005926.1159009-1-ankur.a.arora@oracle.com> <20250710005926.1159009-13-ankur.a.arora@oracle.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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20250710005926.1159009-13-ankur.a.arora@oracle.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: MnXx4xgEOY2NxgPLq-b1vQZscnmMIBLEjiFuncLQqi0_1752233969 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 0F2871C0017 X-Stat-Signature: tkwahjch6kpde5964a1k138ctbotzon1 X-HE-Tag: 1752233972-811248 X-HE-Meta: U2FsdGVkX1/ZdXOjxTX3flKrVTvOMhZQfxkMXqGvvUf6xgmCXfslNeaWhE8R0wl2BO1sWlzx0bSTkGV+z25sW6V307H5vXJBtZZ/jTonPsW35nlMaSr1nM34XLbZ1XReVYhOL+FLwmXtKOrzeHGccIgSToklGzO59LhlDIKIcaDVQ3XiFGntp40Lb5+nQRUF5hnl+hMjoBRQvTXHejlB7A6/0StN3LDZreqK3ohX9gH8nqi6tCJg3Vny1iK2ICCQrCO0zmMwwyiy3NvZJkYeZ5z4zqd5FwjBH8nwcIGsptwUgF2DMuypax2qD4hEyMBlBfmtokjqiNUJMOm6hfhZv6FsFDyurQ5+QU2JLH6XUNe9gfmegYLgbRfBXLamxxBbkz2R7pTymVh7NGoiBfCnxWj1WOnqTI+FSms0aUTcmhsrtcDykUvmwUX05dmwGHfiDPOSY7d9dCli+lHbDiWPhIFSdyupzmCrVDh9FFMejuKR1lFUUH4C0ATBE5EBzidMD0MRT1/ywptGWimlZjp63bnbuBsYUOSfYsRi7zKJ6iZulqDCj1aQBW1J8oDDxe9sxcuOyDuQOlO6MmEvd5FLRe6DQUG48Hpvz1tSyXVdrDBRHhdpovcCn6z2DHnzeCMp3Ffq5y7QO0+cnu4uiugW+uB0ozATrvv3h/eoYR3fJrv7QfQHS/niXXvIXoEjOze7kBEzKNWf/xhPoZvPtlAbBvTXS1XNrCTu31xS3pfIFCURpOvleJLAXkxo6rclfTd7W8a2cq74GgdOwNslN5H8Ot0QeRSimsVFsknFX4C3T6I1Lomquo2dRPT7DaX9Ax6WmZGvEOFmT6S3KMlrEJraFWfwFRflNsZUYsSbcxRh0rbDTx11DpZZ7CzHXjVs7bLBVmyIhSx1V7ahinhaTIEX/+t2I6CU20eww4ug6ldm5D3HtBgmMZ67ZLjy6v8wRF5kyXE0yxIfEcWsYQL4rkk CF83SeDD tAninjqO8MlAPUi7klOM9dEIqm7WYSMndZKEy0utB2s72e7t/ewDSpIU/TVQD2MTSKF/Ep8rjVhU+xld+PIsfvzK1CsxccYkPrceLOhw9zsZLrqdVCQ6fr2hwGAmjgLsoMvGvXWGkIVQlG0ENvwNPUBa4CGshsHPyi/+XU197K2nLdjgvqhk1iiz5a4/eomzhQX96Nx8Y7lmmwe1Qf9gAteFUzXNXloLSUZfpNtCKosu+UMhGXLaXwHkLnIF1vJwdMp7RXEE/JcgZxigbbRM325tyqIuo1C4CpQT42y2pKazRjAYSGFQjdWhopSSYbw0Qq3rDmvKFqipRRR6UVEOLdC4vRlSKVZh+7duj+sng8kJAGUkZ5va/QE18OhYsswZQOlF/9Zh79998saE1sd2IsEG9EcPOkW1JHC9E/OiXoZIrkKTzvn/vw/ctaGRNaGiFcL1slzh4wE+VrEI= 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 10.07.25 02:59, Ankur Arora wrote: > Add CONFIG_CLEAR_PAGE_EXTENT to allow clearing of page-extents > where architecturally supported. > > This is only available with !CONFIG_HIGHMEM because the intent is to > use architecture support to clear contiguous extents in a single > operation (ex. via FEAT_MOPS on arm64, string instructions on x86) > which excludes any possibility of interspersing kmap()/kunmap(). > > Signed-off-by: Ankur Arora > --- > mm/Kconfig | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/mm/Kconfig b/mm/Kconfig > index 781be3240e21..a74a5e02de28 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -910,6 +910,15 @@ config NO_PAGE_MAPCOUNT > > endif # TRANSPARENT_HUGEPAGE > > +config CLEAR_PAGE_EXTENT > + def_bool y > + depends on !HIGHMEM && ARCH_HAS_CLEAR_PAGES > + depends on TRANSPARENT_HUGEPAGE || HUGETLBFS > + > + help > + Use architectural support for clear_pages() to zero page-extents. > + This is likely to be faster than zeroing page-at-a-time. > + IIRC, adding a help text will make this option be configurable by the user, no? This seems like something we can just keep internal, right? -- Cheers, David / dhildenb