io_uring/rsrc: keep one global dummy_ubuf

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We set empty registered buffers to dummy_ubuf as an optimisation.
Currently, we allocate the dummy entry for each ring, whenever we can
simply have one global instance.

We're casting out const on assignment, it's fine as we're not going to
change the content of the dummy, the constness gives us an extra layer
of protection if sth ever goes wrong.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/e4a96dda35ab755914bc43f6781bba0df97ac489.1691757663.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2023-08-11 13:53:46 +01:00 • committed by Jens Axboe

parent b6b2bb58a7

commit 19a63c4021

2 changed files with 10 additions and 13 deletions

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9

io_uring/io_uring.c

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14

io_uring/rsrc.c

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