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906c6caaf5
Linked timeout handling during issuing is heavy, it adds extra instructions and forces to save the next linked timeout before io_issue_sqe(). Follwing the same reasoning as in refcounting patches, a request can't be freed by the time it returns from io_issue_sqe(), so now we don't need to do io_prep_linked_timeout() in advance, and it can be delayed to colder paths optimising the generic path. Also, it should also save quite a lot for requests with linked timeouts and completed inline on timeout spinlocking + hrtimer_start() + hrtimer_try_to_cancel() and so on. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/19bfc9a0d26c5c5f1e359f7650afe807ca8ef879.1628981736.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.