block: optimise bvec_iter_advance()

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bvec_iter_advance() is quite popular, but compilers fail to do proper
alias analysis and optimise it good enough. The assembly is checked
for gcc 9.2, x86-64.

- remove @iter->bi_size from min(...), as it's always less than @bytes.
Modify at the beginning and forget about it.

- the compiler isn't able to collapse memory dependencies and remove
writes in the loop. Help it by explicitely using local vars.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

...

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Pavel Begunkov 2019-11-30 23:23:52 +03:00 • committed by Jens Axboe

parent 8cdda87a44

commit 795ee49c1a

1 changed files with 10 additions and 12 deletions

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include/linux/bvec.h

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