@willy The following patches that relevant to you but are missing your RVB. Do you think you can take a look when you have time? readahead: allocate folios with mapping_min_order in readahead mm: split a folio in minimum folio order chunks -- Pankaj > From: Pankaj Raghav <p.raghav@xxxxxxxxxxx> > > This is the 11th version of the series that enables block size > page size > (Large Block Size) in XFS. > 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. > > 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. > > There are some tests that assumes block size < page size that needs to be fixed. > We have a tree with fixes for xfstests [4], most of the changes have been posted > already, and only a few minor changes need to be posted. Already part of these > changes has been upstreamed to fstests, and new tests have also been written and > are out for review, namely for mmap zeroing-around corner cases, compaction > and fsstress races on mm, and stress testing folio truncation on file mapped > folios. > > 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 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-v11 tag [6]. > > [0] https://lore.kernel.org/lkml/20230915183848.1018717-1-kernel@xxxxxxxxxxxxxxxx/ > [1] https://www.youtube.com/watch?v=ar72r5Xf7x4 > [2] https://lkml.kernel.org/r/20240501153120.4094530-1-willy@xxxxxxxxxxxxx > [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@xxxxxxxxxxxxxxxxxxxx/#t > > Changes since v10: > - Revert back to silent clamping in mapping_set_folio_range(). > - Moved mapping_max_folio_size_supported() to patch 10. > - Collected RVB from Darrick. > > Dave Chinner (1): > xfs: use kvmalloc for xattr buffers > > Luis Chamberlain (1): > mm: split a folio in minimum folio order chunks > > Matthew Wilcox (Oracle) (1): > fs: Allow fine-grained control of folio sizes > > Pankaj Raghav (7): > filemap: allocate mapping_min_order folios in the page cache > readahead: allocate folios with mapping_min_order in readahead > filemap: cap PTE range to be created to allowed zero fill in > folio_map_range() > iomap: fix iomap_dio_zero() for fs bs > system page size > xfs: expose block size in stat > xfs: make the calculation generic in xfs_sb_validate_fsb_count() > xfs: enable block size larger than page size support > > fs/iomap/buffered-io.c | 4 +- > fs/iomap/direct-io.c | 45 +++++++++++-- > fs/xfs/libxfs/xfs_attr_leaf.c | 15 ++--- > fs/xfs/libxfs/xfs_ialloc.c | 5 ++ > fs/xfs/libxfs/xfs_shared.h | 3 + > fs/xfs/xfs_icache.c | 6 +- > fs/xfs/xfs_iops.c | 2 +- > fs/xfs/xfs_mount.c | 8 ++- > fs/xfs/xfs_super.c | 28 +++++--- > include/linux/huge_mm.h | 14 ++-- > include/linux/pagemap.h | 122 ++++++++++++++++++++++++++++++---- > mm/filemap.c | 36 ++++++---- > mm/huge_memory.c | 59 ++++++++++++++-- > mm/readahead.c | 83 +++++++++++++++++------ > 14 files changed, 345 insertions(+), 85 deletions(-) > > > base-commit: 2347b4c79f5e6cd3f4996e80c2d3c15f53006bf5 > -- > 2.44.1 >
