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b878dbbe2a
This patchset looks to reduce iget overhead in two ways: First, a previous patch conditionally set DONTCACHE on inodes during xchk_irele on the grounds that we knew better at irele time if an inode should be dropped. Unfortunately, over time that patch morphed into a call to d_mark_dontcache, which resulted in inodes being dropped even if they were referenced by the dcache. This actually caused *more* recycle overhead than if we'd simply called xfs_iget to set DONTCACHE only on misses. The second patch reduces the cost of untrusted iget for a vectored scrub call by having the scrubv code maintain a separate refcount to the inode so that the cache will always hit. This has been running on the djcloud for months with no problems. Enjoy! Signed-off-by: Darrick J. Wong <djwong@kernel.org> -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQQ2qTKExjcn+O1o2YRKO3ySh0YRpgUCZih1NwAKCRBKO3ySh0YR ppWZAPsGOI6tY2LP4pqA3M2BzsERBICC8uflKeeUbYF12p/c3wEAyLaHWnVhD36D rP/dVedTTuhpZQBAd6mdfA5puq72PgU= =bSz3 -----END PGP SIGNATURE----- Merge tag 'reduce-scrub-iget-overhead-6.10_2024-04-23' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-6.10-mergeC xfs: reduce iget overhead in scrub This patchset looks to reduce iget overhead in two ways: First, a previous patch conditionally set DONTCACHE on inodes during xchk_irele on the grounds that we knew better at irele time if an inode should be dropped. Unfortunately, over time that patch morphed into a call to d_mark_dontcache, which resulted in inodes being dropped even if they were referenced by the dcache. This actually caused *more* recycle overhead than if we'd simply called xfs_iget to set DONTCACHE only on misses. The second patch reduces the cost of untrusted iget for a vectored scrub call by having the scrubv code maintain a separate refcount to the inode so that the cache will always hit. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Chandan Babu R <chandanbabu@kernel.org> * tag 'reduce-scrub-iget-overhead-6.10_2024-04-23' of https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux: xfs: only iget the file once when doing vectored scrub-by-handle xfs: use dontcache for grabbing inodes during scrub |
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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 reStructuredText 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.