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6347558764
This commit converts the `choose group` logic to `scan group` using
previously prepared helper functions. This allows us to leverage xarrays
for ordered non-linear traversal, thereby mitigating the "bouncing" issue
inherent in the `choose group` mechanism.
This also decouples linear and non-linear traversals, leading to cleaner
and more readable code.
Key changes:
* ext4_mb_choose_next_group() is refactored to ext4_mb_scan_groups().
* Replaced ext4_mb_good_group() with ext4_mb_scan_group() in non-linear
traversals, and related functions now return error codes instead of
group info.
* Added ext4_mb_scan_groups_linear() for performing linear scans starting
from a specific group for a set number of times.
* Linear scans now execute up to sbi->s_mb_max_linear_groups times,
so ac_groups_linear_remaining is removed as it's no longer used.
* ac->ac_criteria is now used directly instead of passing cr around.
Also, ac->ac_criteria is incremented directly after groups scan fails
for the corresponding criteria.
* Since we're now directly scanning groups instead of finding a good group
then scanning, the following variables and flags are no longer needed,
s_bal_cX_groups_considered is sufficient.
s_bal_p2_aligned_bad_suggestions
s_bal_goal_fast_bad_suggestions
s_bal_best_avail_bad_suggestions
EXT4_MB_CR_POWER2_ALIGNED_OPTIMIZED
EXT4_MB_CR_GOAL_LEN_FAST_OPTIMIZED
EXT4_MB_CR_BEST_AVAIL_LEN_OPTIMIZED
Signed-off-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Link: https://patch.msgid.link/20250714130327.1830534-17-libaokun1@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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.