io_uring/rsrc: optimise single entry advance

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Iterating within the first bvec entry should be essentially free, but we
use iov_iter_advance() for that, which shows up in benchmark profiles
taking up to 0.5% of CPU. Replace it with a hand coded version.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2023-02-22 14:36:50 +00:00 • committed by Jens Axboe

parent edd4782696

commit b000ae0ec2

1 changed files with 4 additions and 1 deletions

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io_uring/rsrc.c

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