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08635bae0b
btrfs_schedule_bio() hands IO off to a helper thread to do the actual submit_bio() call. This has been used to make sure async crc and compression helpers don't get stuck on IO submission. To maintain good performance, over time the IO submission threads duplicated some IO scheduler characteristics such as high and low priority IOs and they also made some ugly assumptions about request allocation batch sizes. All of this cost at least one extra context switch during IO submission, and doesn't fit well with the modern blkmq IO stack. So, this commit stops using btrfs_schedule_bio(). We may need to adjust the number of async helper threads for crcs and compression, but long term it's a better path. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: Chris Mason <clm@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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.