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A mirror of the official Linux kernel repository just in case
956f1b8f80
Reduce the performance impact of the reverse mapping btree when reflink is enabled by using the much faster non-overlapped btree lookup functions when we're searching the rmap index with a fully specified key. If we find the exact record we're looking for, great! We don't have to perform the full overlapped scan. For filesystems with high sharing factors this reduces the xfs_scrub runtime by a good 15%%. This has been shown to reduce the fstests runtime for realtime rmap configurations by 30%%, since the lack of AGs severely limits scalability. v2: simplify the non-overlapped lookup code per dave comments -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEUzaAxoMeQq6m2jMV+H93GTRKtOsFAmJq5VkACgkQ+H93GTRK tOvpZBAAiwV94XsmJnQkffzLTvlVUy68vLevg+6zi3ALbg8QHN8XoXR/SgBYRAZ0 8KjoLGbLEV35u7f6NVJOXRvFk1/7yzvwutziuSSYx24ajxUFLK/OCHel1/YAQ6wh sdcfGdCtK9/iiSPyc6HXSekpnz0bVhRRtfKiHtstZgGlL7qGXDR3+NTbAjkxgNcu gHnZpO+16Y3bqsZQK5itoPHNqrdLT4GnSfGexmTXykYdAukooF6ZOE2MUyh/vX1j Em/ZJ5agEPLTYhmHWu5n+Phqmb+vLueFtl3jkBf50VYojokm2dt/MU6Z6zctB4p4 xh6UmkQ7LhGckvKTh3NW88RP3/sBt5YNFPGo9xpx1aPyu5Os+5NcOjKX7XEtp4Xo ufyLy9y1muzQrMheIsSfpWAkZmu3/BLSBGH7gFcyHxIVZiuVfzTfOm7WKteoOFoW FUr46H+SUXqKA1h4lXIUsaH6T+D6Z32XTh1RoUx6B2rYQsB1kIDT9wTNYUNeS44e FZPDe/zZ2FSVpqcndjyOhhQdv+llK6m2c93acgL/MMNvOvH9cIDCkLUX/irs9h33 r5V4q1PlYm+QMLxd1/h597aYjQLYoJFBDeLIEtnWsoY4nvjLkcAE/Nyr39e5tqes YJ+k724XzW5vC7QGJjOH6gAXFO6zRGMOEIgn6+oUKiVS2EVG57w= =73GF -----END PGP SIGNATURE----- Merge tag 'rmap-speedups-5.19_2022-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux into xfs-5.19-for-next xfs: fix rmap inefficiencies Reduce the performance impact of the reverse mapping btree when reflink is enabled by using the much faster non-overlapped btree lookup functions when we're searching the rmap index with a fully specified key. If we find the exact record we're looking for, great! We don't have to perform the full overlapped scan. For filesystems with high sharing factors this reduces the xfs_scrub runtime by a good 15%%. This has been shown to reduce the fstests runtime for realtime rmap configurations by 30%%, since the lack of AGs severely limits scalability. Signed-off-by: Dave Chinner <david@fromorbit.com> |
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| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.