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95175dafc4
For zoned block devices, an array of zone types for each device is allocated and initialized in order to determine if a section is stored on a sequential zone (zone reset needed) or a conventional zone (no zone reset needed and regular discard applies). Considering this usage, the zone types stored in memory can be replaced with a bitmap to indicate an equivalent information, that is, if a zone is sequential or not. This reduces the memory usage for each zoned device by roughly 8: on a 14TB disk with zones of 256 MB, the zone type array consumes 13x4KB pages while the bitmap uses only 2x4KB pages. This patch changes the f2fs_dev_info structure blkz_type field to the bitmap blkz_seq. Access to this bitmap is done using the helper function f2fs_blkz_is_seq(), which is a rewrite of the function get_blkz_type(). Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> |
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| 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.