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ctx->flags are heavily used by both, completion and submission sides, so move it out from the ctx fields related to submissions. Instead, place it together with ctx->refs, because it's already cacheline-aligned and so pads lots of space, and both almost never change. Also, in most occasions they are accessed together as refs are taken at submission time and put back during completion. Do same with ctx->rings, where the pointer itself is never modified apart from ring init/free. Note: in percpu mode, struct percpu_ref doesn't modify the struct itself but takes indirection with ref->percpu_count_ptr. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/4c48c173e63d35591383ba2b87e8b8e8dfdbd23d.1623709150.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.