io_uring: shrink final link flush

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All good users should not set IOSQE_IO_*LINK flags for the last request
of a link. io_uring flushes collected links at the end of submission,
but it's not the optimal way and so we don't care too much about it.
Replace io_queue_sqe() call with io_queue_sqe_fallback() as the former
one is inlined and will generate a bunch of extra code. This will also
help compilers with the submission path inlining.

> size ./fs/io_uring.o
   text    data     bss     dec     hex filename
  87265   13734       8  101007   18a8f ./fs/io_uring.o
> size ./fs/io_uring.o
   text    data     bss     dec     hex filename
  87073   13734       8  100815   189cf ./fs/io_uring.o

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/01fb5e417ef49925d544a0b0bae30409845ed2b4.1649771823.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Pavel Begunkov 2022-04-12 15:09:45 +01:00 • committed by Jens Axboe

parent 90e7c35fb8

commit e126391c09

1 changed files with 2 additions and 2 deletions

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fs/io_uring.c

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