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b=nNBm8zcxxXY1bW1Jx06JgkcDaCYB11moLnPLADeWeaWCvoe+GRIL0gbf+sLlgCe8H +4D2ONNcUJrEZhesbBBxoePGgm7yTsePEWpUYmgXc+OlpJWn31es/QnYEIacJlczjV AGqlxBiCtfiAaIOFXEEPOdbNvfxpdv4ToC6RwzhjswvOyRpFJWrDMkK2mmere5UNUK n95C4lY8blVz38eHiYgRsWE9qLEnTySygu9US6T8CCeOceZyPTwE+d8dQdcy+MhGcm lNdY8F4mJ0ycz6JQ22eUXpGtijKX9rOy2ctsVK4riTq5HqsMbQ26s4Gni4Nl9NZZA6 WYJXlAJsLTW8A== Message-ID: Date: Wed, 15 Oct 2025 16:11:35 +0900 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: allow file systems to increase the minimum writeback chunk size To: Christoph Hellwig , Christian Brauner , Jan Kara , Carlos Maiolino Cc: Andrew Morton , willy@infradead.org, hans.holmberg@wdc.com, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org References: <20251015062728.60104-1-hch@lst.de> From: Damien Le Moal Content-Language: en-US Organization: Western Digital Research In-Reply-To: <20251015062728.60104-1-hch@lst.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Queue-Id: 6F3F7140004 X-Rspamd-Server: rspam03 X-Stat-Signature: o79cwyaitenbndfgsiz3oibopuzbwi7a X-HE-Tag: 1760512298-613781 X-HE-Meta: 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 zBt/hjAj mHCJG6OlslR/63SDGIxJ81SycnUrBqrE2nPGIG+UBwq30CnN+JMRsfKnMkBZLUulGkCaXC7A4L+w8uuJaHAX1TY+sJUO/wVwtoPfsmT+xeQss+zPz+PkRtJmSCD7JGyBCg11nFHvOrNkYCq5Wn4oBUlKTltGJ6YXve+dxBasM0SSvqF9AkpTQP5W8/UtNfQWuYDvQIpc/a+ZNYsgu92QR2TZ8d7wrIzCMDdN8jyhfaPYWneID6lnoqEbOxJ8H3ND9AqONI5RIIudCaQAjWJ55Qcj/hnEFO/JyQAEv6z8/+hLLfqTFUkZ2KxuiW98W+sQudpEq 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 2025/10/15 15:27, Christoph Hellwig wrote: > Hi all, > > The relatively low minimal writeback size of 4MiB leads means that > written back inodes on rotational media are switched a lot. Besides > introducing additional seeks, this also can lead to extreme file > fragmentation on zoned devices when a lot of files are cached relative > to the available writeback bandwidth. > > Add a superblock field that allows the file system to override the > default size, and set it to the zone size for zoned XFS. For the series: Tested-by: Damien Le Moal -- Damien Le Moal Western Digital Research