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A mirror of the official Linux kernel repository just in case
7f67fdae33
From Yu Kuai (with minor changes by Song Liu): The background is that currently bitmap is using a global spin_lock, causing lock contention and huge IO performance degradation for all raid levels. However, it's impossible to implement a new lock free bitmap with current situation that md-bitmap exposes the internal implementation with lots of exported apis. Hence bitmap_operations is invented, to describe bitmap core implementation, and a new bitmap can be introduced with a new bitmap_operations, we only need to switch to the new one during initialization. And with this we can build bitmap as kernel module, but that's not our concern for now. This version was tested with mdadm tests and lvm2 tests. This set does not introduce new errors in these tests. * md-6.12-bitmap: (42 commits) md/md-bitmap: make in memory structure internal md/md-bitmap: merge md_bitmap_enabled() into bitmap_operations md/md-bitmap: merge md_bitmap_wait_behind_writes() into bitmap_operations md/md-bitmap: merge md_bitmap_free() into bitmap_operations md/md-bitmap: merge md_bitmap_set_pages() into struct bitmap_operations md/md-bitmap: merge md_bitmap_copy_from_slot() into struct bitmap_operation. md/md-bitmap: merge get_bitmap_from_slot() into bitmap_operations md/md-bitmap: merge md_bitmap_resize() into bitmap_operations md/md-bitmap: pass in mddev directly for md_bitmap_resize() md/md-bitmap: merge md_bitmap_daemon_work() into bitmap_operations md/md-bitmap: merge bitmap_unplug() into bitmap_operations md/md-bitmap: merge md_bitmap_unplug_async() into md_bitmap_unplug() md/md-bitmap: merge md_bitmap_sync_with_cluster() into bitmap_operations md/md-bitmap: merge md_bitmap_cond_end_sync() into bitmap_operations md/md-bitmap: merge md_bitmap_close_sync() into bitmap_operations md/md-bitmap: merge md_bitmap_end_sync() into bitmap_operations md/md-bitmap: remove the parameter 'aborted' for md_bitmap_end_sync() md/md-bitmap: merge md_bitmap_start_sync() into bitmap_operations md/md-bitmap: merge md_bitmap_endwrite() into bitmap_operations md/md-bitmap: merge md_bitmap_startwrite() into bitmap_operations ... Signed-off-by: Song Liu <song@kernel.org> |
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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.