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64d0361114
Add a file write life time data placement allocation scheme that aims to minimize fragmentation and thereby to do two things: a) separate file data to different zones when possible. b) colocate file data of similar life times when feasible. To get best results, average file sizes should align with the zone capacity that is reported through the XFS_IOC_FSGEOMETRY ioctl. This improvement in data placement efficiency reduces the number of blocks requiring relocation by GC, and thus decreases overall write amplification. The impact on performance varies depending on how full the file system is. For RocksDB using leveled compaction, the lifetime hints can improve throughput for overwrite workloads at 80% file system utilization by ~10%, but for lower file system utilization there won't be as much benefit in application performance as there is less need for garbage collection to start with. Lifetime hints can be disabled using the nolifetime mount option. Signed-off-by: Hans Holmberg <hans.holmberg@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: "Darrick J. Wong" <djwong@kernel.org> |
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| certs | ||
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
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| rust | ||
| samples | ||
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| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| 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 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.