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Chains of memory accesses are never good for performance. The req->task->io_uring->in_cancel in io_req_local_work_add() is there so that when a task is exiting via io_uring_try_cancel_requests() and starts waiting for completions, it gets woken up by every new task_work item queued. Do a little trick by announcing waiting in io_uring_try_cancel_requests(), making io_req_local_work_add() wake us up. We also need to check for deferred tw items after prepare_to_wait(TASK_INTERRUPTIBLE); Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/fb11597e9bbcb365901824f8c5c2cf0d6ee100d0.1680782017.git.asml.silence@gmail.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 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.