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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777468443; bh=Ln+lOviPC8lyDW1Zl7BSxk4DMjngJAfX53+OE8S4du8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=p4mPOgufJeMY1q3K5t4lY4ia227BGcQML437KJAShhLTaJE4dvY7JzvwA8ZSKOAjv U3RC8RR9jDPKYhcceCIZMp5zboMKNCio0KKszuU8A37WWML2XCXZsTL8rZjGP77QSm MJBqajJ7yUUOkboXc5Sdjjjz7PiEwKYO53J/8iiqanCfXwJqwDUWHBj1N5rD5ybZv3 775EB4OU/J+2Cy1OKIRUpCM/LrxLxXrO3UcwiX50mnDokCPbiPUgLPTSD4e0hT0CQ2 5thn/2pM38O+m1Mgp7kEV7WAg/LkjXc8LO4pkG5NbuFUVk6603ScyvrcQrpLwpFL8I vPCBxx61zcNaQ== Message-ID: <69bb12b1-386b-41e4-ac98-9d545818d67d@kernel.org> Date: Wed, 29 Apr 2026 15:14:00 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5] selftests/mm: khugepaged: initialize file contents via mmap To: Vineet Agarwal , akpm@linux-foundation.org, ljs@kernel.org, shuah@kernel.org Cc: ziy@nvidia.com, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260429115816.98824-1-agarwal.vineet2006@gmail.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-Stat-Signature: jd4fiakf1e63j1ptq99xbguza3qs1966 X-Rspam-User: X-Rspamd-Queue-Id: 79A661A0016 X-Rspamd-Server: rspam07 X-HE-Tag: 1777468444-585556 X-HE-Meta: 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 0u87uJl0 KGpIjV9OhLsPgUkyinOwEXMnaLDPYBqdejV+yVKaIbxe58cerXM0Hced28pzITMsFCY38CPiQpFYToHRfNEYEspAks4iWjuHMh0wMgsKZGUP1geWvui8nhfLU3L9LsQB3tZ8nJ2k0sz034vMnSaaBV/Ah1JNIzAPuzo0FBCr7xNd/YjVE2pLP3i099ygrkprqd3nE9M3Fj0FtghyRW5tVgzp5R1knOPYRcAs5J0d/vE562leq1wzvWQGpyIulpQkCfj8eg9ZZmrDyKAAaLU4FaxCymXzWKjVFMMl6u2Flb3xnOu4RkZkn8MFHvAs6ityTWcUubQl3jAzg+yonF+FUE9XXxGsAZ4Xc5AePbalVgamMm07aAhv8r8W85OjJ5U/Fr7i8f3rm6ZHZtN8USn9Mf4MT8Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/29/26 13:58, Vineet Agarwal wrote: > file_setup_area() currently allocates anonymous memory, fills it, > and writes it into the backing file used for collapse testing. > > Instead of copying data through write(), resize the file with > ftruncate(), map it directly with MAP_SHARED, and initialize the > mapped area in place. > > This simplifies the setup path and avoids the need for explicit > partial write handling. > > Signed-off-by: Vineet Agarwal Acked-by: David Hildenbrand (Arm) Thanks! :) -- Cheers, David