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Wed, 21 Jun 2023 08:38:25 +0000 (GMT) Received: from eusmgms2.samsung.com (unknown [182.198.249.180]) by eusmtrp2.samsung.com (KnoxPortal) with ESMTP id 20230621083825eusmtrp233925ce44cddfcf590425c8d7e60f792~qn8sjqxzl0284602846eusmtrp28; Wed, 21 Jun 2023 08:38:25 +0000 (GMT) X-AuditID: cbfec7f2-a3bff7000002a5b7-81-6492b7018925 Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id 64.8B.14344.107B2946; Wed, 21 Jun 2023 09:38:25 +0100 (BST) Received: from CAMSVWEXC02.scsc.local (unknown [106.1.227.72]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20230621083825eusmtip22703050621435331ea1809e6ba0deb8c~qn8saRz8T3188231882eusmtip2T; Wed, 21 Jun 2023 08:38:25 +0000 (GMT) Received: from localhost (106.110.32.140) by CAMSVWEXC02.scsc.local (2002:6a01:e348::6a01:e348) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 21 Jun 2023 09:38:24 +0100 From: Pankaj Raghav To: , , CC: , , , , , , Pankaj Raghav Subject: [RFC 0/4] minimum folio order support in filemap Date: Wed, 21 Jun 2023 10:38:19 +0200 Message-ID: <20230621083823.1724337-1-p.raghav@samsung.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 X-Originating-IP: [106.110.32.140] X-ClientProxiedBy: CAMSVWEXC02.scsc.local (2002:6a01:e348::6a01:e348) To CAMSVWEXC02.scsc.local (2002:6a01:e348::6a01:e348) X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprEKsWRmVeSWpSXmKPExsWy7djP87qM2yelGHx5pGKx5dg9Ros9iyYx WaxcfZTJ4tqZHiaLPXtPslhc3jWHzeLGhKeMFr9/zGFz4PA4tUjCY/MKLY9NqzrZPHbfbGDz 2Hy62uPzJrkAtigum5TUnMyy1CJ9uwSujJZpD9gKukUr5s3SbGDcKdjFyMEhIWAi8aNZrYuR k0NIYAWjxK35yV2MXED2F0aJw/t2MUE4nxklurt3s4FUgTR0znjIDNGxnFGi9b4LhA1UtP6U NETDFkaJrW/WsYBsYBPQkmjsZAepERFwkNi8cQ4rSA2zwB5GiQONn5hAEsIClhIz164Cs1kE VCV+PZ4DZvMKWEt8f7qPEeJSeYnFDyQgwoISJ2c+YQGxmYHCzVtnM0PcpiTRsPkMC4RdK7G3 +QA7yC4JgSccEssf7mSFmOMicXtCAUSNsMSr41vYIWwZif875zNB2NUST2/8ZobobWGU6N+5 ng2i11qi70wOiMksoCmxfpc+RLmjxNNt15ghKvgkbrwVhLiMT2LStulQYV6JjjYhiGo1idX3 3rBMYFSeheSXWUh+mYUwfwEj8ypG8dTS4tz01GLDvNRyveLE3OLSvHS95PzcTYzAZHP63/FP Oxjnvvqod4iRiYPxEKMEB7OSCK/spkkpQrwpiZVVqUX58UWlOanFhxilOViUxHm1bU8mCwmk J5akZqemFqQWwWSZODilGpi4LLcYtjFOPG7x97V1hovF5vgQ3RdL/tZcmOBWnbPJYrGnqM7U HN3KUFavzrtca+OlpfztltY41W5OWVWm1zArhvfb017GlvY72VNkVJ3udX07aXeDY2Na/80v y8+rdTNpLjisdngNt+5NNh0hg5wjJUVe5qxBl/Xtf+SJsm6x0wr82yAm03Uu0zQtZKfh42km bef6KvZdWHbj9Zvl+TwGxo+K/MNyVm6cadzMqqT0wVTLVLdXY8U89XU7jI7cCDilHL099wZn 0fY/D+zqOLTWL/PbnVUeGHlYWcUkwN3z899LvmZyhrore++9+Leg2vSiT9PbKZ+3L2vmr+hd 4incJqqxaD3T58UsMyVslViKMxINtZiLihMBZ9GixqUDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrBIsWRmVeSWpSXmKPExsVy+t/xe7qM2yelGCy6xGWx5dg9Ros9iyYx WaxcfZTJ4tqZHiaLPXtPslhc3jWHzeLGhKeMFr9/zGFz4PA4tUjCY/MKLY9NqzrZPHbfbGDz 2Hy62uPzJrkAtig9m6L80pJUhYz84hJbpWhDCyM9Q0sLPSMTSz1DY/NYKyNTJX07m5TUnMyy 1CJ9uwS9jJZpD9gKukUr5s3SbGDcKdjFyMkhIWAi0TnjIXMXIxeHkMBSRomddw4zQiRkJDZ+ ucoKYQtL/LnWxQZR9JFR4tKls1DOFkaJyU9+M3UxcnCwCWhJNHaygzSICDhIbN44hxWkhllg D6PEgcZPTCAJYQFLiZlrV4HZLAKqEr8ezwGzeQWsJb4/3ccIMkdCQF5i8QMJEJNZQFNi/S59 iApBiZMzn7CA2MxAFc1bZzND3KYk0bD5DAuEXSvR+eo02wRGoVkI3bOQdM9C0r2AkXkVo0hq aXFuem6xkV5xYm5xaV66XnJ+7iZGYJRtO/Zzyw7Gla8+6h1iZOJgPMQowcGsJMIru2lSihBv SmJlVWpRfnxRaU5q8SFGU6BnJjJLiSbnA+M8ryTe0MzA1NDEzNLA1NLMWEmc17OgI1FIID2x JDU7NbUgtQimj4mDU6qBSeOY2KOk29wdTCwSdsIaD88GJRx6mpm1eVXi4oTsycwbs2ofGl3f 3akd8Txra/csluB/jsUJvxW/vzhpu/T/cu+5jy9e2bdx3xMXQ8e3EQ3z2pgW7oiYvq7+8pkZ PTdD5m57rd3SVKZ1unGX8ssFtmkMXhc//1dZOPnT3096Xm2dc3k1V2Rcfqf4yn1tjz1v6P6j 09ZZPVso8t/hhfXNeYuzNI8WBbsdzHP7pWsX/Ejj1s6eVLPqTS9PeHGFeepdt1/tuvtXfQNf 0NQE/5j40601L/7sP+K44OuL/2wiSQrMTy8svnNkUmUC0+5/ykbKTzhenvq7aSM/z4v7uycf kL1v3Hr3vP9yk/1S1zXfnLqkxFKckWioxVxUnAgAppSQgzsDAAA= X-CMS-MailID: 20230621083825eucas1p1b05a6d7e0bf90e7a3d8e621f6578ff0a X-Msg-Generator: CA X-RootMTR: 20230621083825eucas1p1b05a6d7e0bf90e7a3d8e621f6578ff0a X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20230621083825eucas1p1b05a6d7e0bf90e7a3d8e621f6578ff0a References: Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org There has been a lot of discussion recently to support devices and fs for bs > ps. One of the main plumbing to support buffered IO is to have a minimum order while allocating folios in the page cache. Hannes sent recently a series[1] where he deduces the minimum folio order based on the i_blkbits in struct inode. This takes a different approach based on the discussion in that thread where the minimum and maximum folio order can be set individually per inode. This series is based on top of Christoph's patches to have iomap aops for the block cache[2]. I rebased his remaining patches to next-20230621. The whole tree can be found here[3]. Compiling the tree with CONFIG_BUFFER_HEAD=n, I am able to do a buffered IO on a nvme drive with bs>ps in QEMU without any issues: [root@archlinux ~]# cat /sys/block/nvme0n2/queue/logical_block_size 16384 [root@archlinux ~]# fio -bs=16k -iodepth=8 -rw=write -ioengine=io_uring -size=500M -name=io_uring_1 -filename=/dev/nvme0n2 -verify=md5 io_uring_1: (g=0): rw=write, bs=(R) 16.0KiB-16.0KiB, (W) 16.0KiB-16.0KiB, (T) 16.0KiB-16.0KiB, ioengine=io_uring, iodepth=8 fio-3.34 Starting 1 process Jobs: 1 (f=1): [V(1)][100.0%][r=336MiB/s][r=21.5k IOPS][eta 00m:00s] io_uring_1: (groupid=0, jobs=1): err= 0: pid=285: Wed Jun 21 07:58:29 2023 read: IOPS=27.3k, BW=426MiB/s (447MB/s)(500MiB/1174msec) Run status group 0 (all jobs): READ: bw=426MiB/s (447MB/s), 426MiB/s-426MiB/s (447MB/s-447MB/s), io=500MiB (524MB), run=1174-1174msec WRITE: bw=198MiB/s (207MB/s), 198MiB/s-198MiB/s (207MB/s-207MB/s), io=500MiB (524MB), run=2527-2527msec Disk stats (read/write): nvme0n2: ios=35614/4297, merge=0/0, ticks=11283/1441, in_queue=12725, util=96.27% One of the main dependency to work on a block device with bs>ps is Christoph's work on converting block device aops to use iomap. [1] https://lwn.net/Articles/934651/ [2] https://lwn.net/ml/linux-kernel/20230424054926.26927-1-hch@lst.de/ [3] https://github.com/Panky-codes/linux/tree/next-20230523-filemap-order-generic-v1 Luis Chamberlain (1): block: set mapping order for the block cache in set_init_blocksize Matthew Wilcox (Oracle) (1): fs: Allow fine-grained control of folio sizes Pankaj Raghav (2): filemap: use minimum order while allocating folios nvme: enable logical block size > PAGE_SIZE block/bdev.c | 9 ++++++++ drivers/nvme/host/core.c | 2 +- include/linux/pagemap.h | 46 ++++++++++++++++++++++++++++++++++++---- mm/filemap.c | 9 +++++--- mm/readahead.c | 34 ++++++++++++++++++++--------- 5 files changed, 82 insertions(+), 18 deletions(-)