tree 02ea0da43b7ad152375b9fb59cd2c90ed0acb1cf
parent a2247f19ee1c5ad75ef095cdfb909a3244b88aa8
author Pavel Begunkov <asml.silence@gmail.com> 1635337267 +0100
committer Jens Axboe <axboe@kernel.dk> 1635339298 -0600

block: avoid extra iter advance with async iocb

Nobody cares about iov iterators state if we return -EIOCBQUEUED, so as
the we now have __blkdev_direct_IO_async(), which gets pages only once,
we can skip expensive iov_iter_advance(). It's around 1-2% of all CPU
spent.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a6158edfbfa2ae3bc24aed29a72f035df18fad2f.1635337135.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>