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ublk_register_io_buf() performs an expensive atomic refcount increment, as well as a lot of pointer chasing to look up the struct request. Create a separate ublk_daemon_register_io_buf() for the daemon task to call. Initialize ublk_io's reference count to a large number, introduce a field task_registered_buffers to count the buffers registered on the daemon task, and atomically subtract the large number minus task_registered_buffers in ublk_commit_and_fetch(). Also obtain the struct request directly from ublk_io's req field instead of looking it up on the tagset. Signed-off-by: Caleb Sander Mateos <csander@purestorage.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20250620151008.3976463-12-csander@purestorage.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
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.