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a67371b7ae
iomap: Add per-block dirty state tracking to iomap iomap today only tracks per-block update state bitmap, this series extends the support by adding per-block dirty state bitmap tracking to iomap buffered I/O path. This helps in reducing the write amplification and improve write performance for large folio writes and for platforms with higher pagesize compared to blocksize. We have seen ~83% performance improvement with these patches using database benchmarking tests, with XFS on 64k pagesize. fio benchmark (as shown in the last patch which adds dirty tracking support) showed close to 16x performance improvement when tested with 64K pagesize on 4k blocksize XFS using nvme on Power. * tag 'iomap-per-block-dirty-tracking' of https://github.com/riteshharjani/linux: iomap: Add per-block dirty state tracking to improve performance iomap: Allocate ifs in ->write_begin() early iomap: Refactor iomap_write_delalloc_punch() function out iomap: Use iomap_punch_t typedef iomap: Fix possible overflow condition in iomap_write_delalloc_scan iomap: Add some uptodate state handling helpers for ifs state bitmap iomap: Drop ifs argument from iomap_set_range_uptodate() iomap: Rename iomap_page to iomap_folio_state and others [djwong: also yay to less write amplification!] Signed-off-by: Darrick J. Wong <djwong@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.