| Message ID | 20240913-vfs-blocksize-ab40822b2366@brauner (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [GIT,PULL] vfs blocksize | expand |
The pull request you sent on Thu, 19 Sep 2024 15:49:53 +0200:
> git@gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-6.12.blocksize
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/171754c3808214d4fd8843eab584599a429deb52
Thank you!
Hey Linus, Now that the large folio/xarry bug is sorted this one seems ready. /* Summary */ This contains the vfs infrastructure as well as the xfs bits to enable support for block sizes (bs) larger than page sizes (ps) plus a few fixes to related infrastructure. There has been efforts over the last 16 years to enable enable Large Block Sizes (LBS), that is block sizes in filesystems where bs > page size. Through these efforts we have learned that one of the main blockers to supporting bs > ps in filesystems has been a way to allocate pages that are at least the filesystem block size on the page cache where bs > ps. Thanks to various previous efforts it is possible to support bs > ps in XFS with only a few changes in XFS itself. Most changes are to the page cache to support minimum order folio support for the target block size on the filesystem. A motivation for Large Block Sizes today is to support high-capacity (large amount of Terabytes) QLC SSDs where the internal Indirection Unit (IU) are typically greater than 4k to help reduce DRAM and so in turn cost and space. In practice this then allows different architectures to use a base page size of 4k while still enabling support for block sizes aligned to the larger IUs by relying on high order folios on the page cache when needed. It also allows to take advantage of the drive's support for atomics larger than 4k with buffered IO support in Linux. As described this year at LSFMM, supporting large atomics greater than 4k enables databases to remove the need to rely on their own journaling, so they can disable double buffered writes, which is a feature different cloud providers are already enabling through custom storage solutions. /* Testing */ gcc version 14.2.0 (Debian 14.2.0-3) Debian clang version 16.0.6 (27+b1) All patches are based on v6.11-rc1 and have been sitting in linux-next. No build failures or warnings were observed. A lot of emphasis has been put on testing using kdevops, starting with an XFS baseline [1]. The testing has been split into regression and progression. The whole test suite was run to check for regressions on existing profiles due to the page cache changes. The split_huge_page_test selftest on XFS filesystem was also run to check for huge page splits in min order chunks is done correctly. No regressions were found with these patches added on top. 8k, 16k, 32k and 64k block sizes were used during feature testing. To compare it with existing support, an ARM VM with 64k base page system without the 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. 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 was done. There were no regressions detected. sysbench on postgres and mysql for several hours was run on LBS XFS without any issues. There's also an eBPF tool called blkalgn [2] to see if IO sent to the device is aligned and at least filesystem block size in length. [1] https://github.com/linux-kdevops/kdevops/blob/master/docs/xfs-bugs.md [2] https://github.com/iovisor/bcc/pull/4813 /* Conflicts */ Merge conflicts with mainline ============================= No known conflicts. Merge conflicts with other trees ================================ No known conflicts. The following changes since commit 8400291e289ee6b2bf9779ff1c83a291501f017b: Linux 6.11-rc1 (2024-07-28 14:19:55 -0700) are available in the Git repository at: git@gitolite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-6.12.blocksize for you to fetch changes up to 71fdfcdd0dc8344ce6a7887b4675c7700efeffa6: Documentation: iomap: fix a typo (2024-09-12 14:07:17 +0200) Please consider pulling these changes from the signed vfs-6.12.blocksize tag. Thanks! Christian ---------------------------------------------------------------- vfs-6.12.blocksize ---------------------------------------------------------------- Brian Foster (2): iomap: fix handling of dirty folios over unwritten extents iomap: make zero range flush conditional on unwritten mappings Christian Brauner (2): Merge patch series "enable bs > ps in XFS" Merge patch series "iomap: flush dirty cache over unwritten mappings on zero range" Christoph Hellwig (5): iomap: handle a post-direct I/O invalidate race in iomap_write_delalloc_release iomap: improve shared block detection in iomap_unshare_iter iomap: pass flags to iomap_file_buffered_write_punch_delalloc iomap: pass the iomap to the punch callback iomap: remove the iomap_file_buffered_write_punch_delalloc return value Dave Chinner (1): xfs: use kvmalloc for xattr buffers Dennis Lam (1): docs:filesystems: fix spelling and grammar mistakes in iomap design page Josef Bacik (1): iomap: add a private argument for iomap_file_buffered_write Luis Chamberlain (2): mm: split a folio in minimum folio order chunks iomap: remove set_memor_ro() on zero page Matthew Wilcox (Oracle) (1): fs: Allow fine-grained control of folio sizes Pankaj Raghav (9): 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 filemap: fix htmldoc warning for mapping_align_index() Documentation: iomap: fix a typo Documentation/filesystems/iomap/design.rst | 8 +- block/fops.c | 2 +- fs/gfs2/file.c | 2 +- fs/iomap/buffered-io.c | 199 ++++++++++++++++++----------- fs/iomap/direct-io.c | 42 +++++- 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_file.c | 2 +- fs/xfs/xfs_icache.c | 6 +- fs/xfs/xfs_iomap.c | 19 +-- fs/xfs/xfs_iops.c | 12 +- fs/xfs/xfs_mount.c | 8 +- fs/xfs/xfs_super.c | 28 ++-- fs/zonefs/file.c | 2 +- include/linux/huge_mm.h | 28 +++- include/linux/iomap.h | 13 +- include/linux/pagemap.h | 124 ++++++++++++++++-- mm/filemap.c | 36 ++++-- mm/huge_memory.c | 65 +++++++++- mm/readahead.c | 83 +++++++++--- 21 files changed, 506 insertions(+), 196 deletions(-)