io_uring: allocate the two rings together

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Both the sq and the cq rings have sizes just over a power of two, and
the sq ring is significantly smaller. By bundling them in a single
alllocation, we get the sq ring for free.

This also means that IORING_OFF_SQ_RING and IORING_OFF_CQ_RING now mean
the same thing. If we indicate this to userspace, we can save a mmap
call.

Signed-off-by: Hristo Venev <hristo@venev.name>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Hristo Venev 2019-08-26 17:23:46 +00:00 • committed by Jens Axboe

parent 27c4d3a325

commit 75b28affdd

1 changed files with 128 additions and 127 deletions

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fs/io_uring.c

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