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If task_state is cleared, io_req_task_work_add() will go the slow path adding a task_work, setting the task_state, waking up the task and so on. Not to mention it's expensive. tctx_task_work() first clears the state and then executes all the work items queued, so if any of them resubmits or adds new task_work items, it would unnecessarily go through the slow path of io_req_task_work_add(). Let's clear the ->task_state at the end. We still have to check ->task_list for emptiness afterward to synchronise with io_req_task_work_add(), do that, and set the state back if we're going to retry, because clearing not-ours task_state on the next iteration would be buggy. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/1ef72cdac7022adf0cd7ce4bfe3bb5c82a62eb93.1623949695.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.