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b=TY0ImQzydhJitS5Ddrvd57wmJkpFKQRHHejclNNLrSp/Pt3ZjbuAZXZ6t/deQEjPo B6RG70234GDvgoN2I1JfdyuZjEp7N7PcfGq56V+OZOfrgX/Kj3BGrDRD6gMp7QdGaZ 3XwaJGMmhDnnGJ9avnNUQFntrpWJ2DEMUmgcarvpvvrVDL+W/u+6c95VquTHO8Ly9L YhjfG/p75Pd4tjFa4tixP2g+M6KlXSRuVMElS1m+U1YdvCaX4tSQDzEzY1TnKgRNIH 2N5F82yOOXvzqrpGDeJFwkB/Mn2fFSJD/5ZgU9X/duY2SuPkz1gG+tRoDpon4nQWBc dSLeX2oApTWMQ== Date: Fri, 22 May 2026 03:59:45 +0000 From: Jaegeuk Kim To: Matthew Wilcox Cc: Theodore Tso , Christoph Hellwig , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, Akilesh Kailash , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, Christian Brauner Subject: Re: [PATCH v2] f2fs: another way to set large folio by remembering inode number Message-ID: References: <20260409134538.3692605-1-jaegeuk@kernel.org> <20260521155748.GA79343@macsyma-wired.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: BBBC7C0007 X-Stat-Signature: bsc3itgeq66n9tut78c4mrfgbhkir1pn X-HE-Tag: 1779422388-662269 X-HE-Meta: U2FsdGVkX1+1xCrNtzf+9sAGKyI4qXNSvW0A98VYNoC7/nPP2xotCXKLwkz/p7r4tZC2UMA7bMGT5aZzSYG94Zn52/rPC4IsOixbuITcaD+gQ9bNUBnGeoy54O9DK2KsVpk5HeXap+YxLHjK8hVW335p/IfBSDnpgHttQP+RSnFRAkafHelh3gelNWoVfEczjn5f0OZdcTBcl/AXI+0E4adPOtjHDlDYb+GYO3q9PuOVPoVMOKBRuG4JyCQGh6dPA3WjNsVLzW+mGsKz+F2Dfz3CCTcgTxu397VlIA0Weg1vNQwaXpQ/SCmp9V0RVHIJvXBcOELMViOYt/V02ETdqY10JsQrBMW66LZJ+J7oY1v6902jQqln9gkiQe5Eo1VPViCo3yuRE6U/iyOten7aBvCFRsnOjCffeETllbt5iYLsb24BfurfemPaxbZCy9o2krNpmFqNPFRHDs50FY046oIzHcL+RawNUS9EAYNtfpxaXHSnpoBegEXiDZpatIxm9MwVEPx+wlaoe7ap4ohMrMM5ssDvaQDTjkPSxjK0w1BcxpJD159VbNs92IbisjCZprNrZP13zQtRk4Ngu/rs707Lv1F/sDWIYq9nGbbdcUZF2L+G0Ja/VdYnwSW0s1qWy4Pv8J0srrAspk5rLIh18snOZ/PuQDplQbLHzcrn8OGm/MnUwNHHdX4+fnhSGbNvZqMHkbaVgOmWfrB/dT1TlBdIk2tNR9jzpEOJ04UABX8okgny97Qjsf/DuFQsB7hJFxm5u1sZM8C/Z0wUgq8mT+2ysaChlCw5ZBgzuF0hcFKs47lisN6Wh3os6fL5MmjhHij+8rjGfhBlFTxPFlJEekPBaiBgUkcDtb4pB8UqHcjCo96jrYLkMXiEIyxLZXi7kqo15/jziiwJjYkhANFvN5GJR+UcW2RvFdShYyG+m538LCM/EvVUooJipj3yO5vV4qV/5dCXf6NIcE9miUj Wjl3ikUn un+MRQfrHDicE7i/weS4tLbKQbodWj2vDw0sfoAkp7getkjiFJNdxcfhmhswjKv+hyw0PHEQRMfZH4N2C6OCFDPzZmdLXb2eHcwYN29n3DYKeSVB6sQD0QT5sTT2etyluoHjPUg0nx3r8A3ZRmN2it8qPxaTh71Vl5+1Q5FCx5o+T/ya0O4xObtH+LwZQluA09FU3Yuj7ZwNVL31NCJySyqGQOuXLWnuMrl2u2+ohErp9doMExmmvG956hbwAR27QaWQ73t3TqzSDSykgphDgk8nPdh0xoVdbBO+P Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 05/21, Matthew Wilcox wrote: > On Thu, May 21, 2026 at 11:57:48AM -0400, Theodore Tso wrote: > > So let me get this straight. This is a magic xattr interface which is > > not even persisted in the file system, but instead sets a 32-bit > > bitmask in the struct inode which disappears once the inode gets > > flushed from the inode stack. And it uses a generic xattr name, > > "user.fadvise". > > > > There's no way in *hell* any other file system is likely to adopt such > > a broken interface, so why didn't you just use an ioctl to set this > > magic f2fs-specific flag? > > I mean, yes, this API is horrendous. But it's just another example of > f2fs thinking it's somehow special and not just enabling large folios > like other filesystems do. This hurts everyone, not just people who use > f2fs. >From the production viewpoint, I raised a concern on setting large folio by default, since that exhausts lots of high-order pages, which were needed for essential system services and critical apps.