Merge patch series "enable bs > ps in XFS"
Pankaj Raghav (Samsung) <kernel@pankajraghav.com> says: This is the 13th version of the series that enables block size > page size (Large Block Size) experimental support in XFS. Please consider this for the inclusion in 6.12. The context and motivation can be seen in cover letter of the RFC v1 [0]. We also recorded a talk about this effort at LPC [1], if someone would like more context on this effort. Thanks to David Howells, the page cache changes have also been tested on top of AFS[2] with mapping_min_order set. A lot of emphasis has been put on testing using kdevops, starting with an XFS baseline [3]. The testing has been split into regression and progression. Regression testing: In regression testing, we ran the whole test suite to check for regressions on existing profiles due to the page cache changes. I also ran split_huge_page_test selftest on XFS filesystem to check for huge page splits in min order chunks is done correctly. No regressions were found with these patches added on top. Progression testing: For progression testing, we tested for 8k, 16k, 32k and 64k block sizes. To compare it with existing support, an ARM VM with 64k base page system (without our patches) was used as a reference to check for actual failures due to LBS support in a 4k base page size system. No new failures were found with the LBS support. We've done some preliminary performance tests with fio on XFS on 4k block size against pmem and NVMe with buffered IO and Direct IO on vanilla Vs + these patches applied, and detected no regressions. We ran sysbench on postgres and mysql for several hours on LBS XFS without any issues. We also wrote an eBPF tool called blkalgn [5] to see if IO sent to the device is aligned and at least filesystem block size in length. For those who want this in a git tree we have this up on a kdevops large-block-minorder-for-next-v13 tag [6]. [0] https://lore.kernel.org/lkml/20230915183848.1018717-1-kernel@pankajraghav.com/ [1] https://www.youtube.com/watch?v=ar72r5Xf7x4 [2] https://lore.kernel.org/linux-mm/3792765.1724196264@warthog.procyon.org.uk/ [3] https://github.com/linux-kdevops/kdevops/blob/master/docs/xfs-bugs.md 489 non-critical issues and 55 critical issues. We've determined and reported that the 55 critical issues have all fall into 5 common XFS asserts or hung tasks and 2 memory management asserts. [4] https://github.com/linux-kdevops/fstests/tree/lbs-fixes [5] https://github.com/iovisor/bcc/pull/4813 [6] https://github.com/linux-kdevops/linux/ [7] https://lore.kernel.org/linux-kernel/Zl20pc-YlIWCSy6Z@casper.infradead.org/#t * patches from https://lore.kernel.org/r/20240822135018.1931258-1-kernel@pankajraghav.com: (5979 commits) xfs: enable block size larger than page size support xfs: make the calculation generic in xfs_sb_validate_fsb_count() xfs: expose block size in stat xfs: use kvmalloc for xattr buffers iomap: fix iomap_dio_zero() for fs bs > system page size filemap: cap PTE range to be created to allowed zero fill in folio_map_range() mm: split a folio in minimum folio order chunks readahead: allocate folios with mapping_min_order in readahead filemap: allocate mapping_min_order folios in the page cache fs: Allow fine-grained control of folio sizes Add linux-next specific files for 20240821 l2tp: use skb_queue_purge in l2tp_ip_destroy_sock af_unix: Don't call skb_get() for OOB skb. dt-bindings: net: socionext,uniphier-ave4: add top-level constraints dt-bindings: net: renesas,etheravb: add top-level constraints dt-bindings: net: mediatek,net: add top-level constraints dt-bindings: net: mediatek,net: narrow interrupts per variants net: Silence false field-spanning write warning in metadata_dst memcpy net: hns3: Use ARRAY_SIZE() to improve readability selftests: net/forwarding: spawn sh inside vrf to speed up ping loop ... Link: https://lore.kernel.org/r/20240822135018.1931258-1-kernel@pankajraghav.comSigned-off-by:Christian Brauner <brauner@kernel.org>
Showing
Please register or sign in to comment