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e342c807f5
When a request is completed with comp_state, its completion reference put is deferred to io_submit_flush_completions(), but the submission is put not far from there, so do it together to save one atomic dec per request. That targets requests that complete inline, e.g. buffered rw, send/recv. Proper benchmarking haven't been conducted but for nops(batch=32) it was around 7901 vs 8117 KIOPS (~2.7%), or ~4% per perf profiling. Signed-off-by: Pavel Begunkov <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.