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io_uring: enable use of bio alloc cache

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Mark polled IO as being safe for dipping into the bio allocation
cache, in case the targeted bio_set has it enabled.

This brings an IOPOLL gen2 Optane QD=128 workload from ~3.2M IOPS to
~3.5M IOPS.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-03-08 11:40:23 -07:00
parent be863b9e43
commit 394918ebb8
1 changed files with 1 additions and 1 deletions
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2
fs/io_uring.c
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@ -2737,7 +2737,7 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe)
!kiocb->ki_filp->f_op->iopoll)
return -EOPNOTSUPP;
kiocb->ki_flags |= IOCB_HIPRI;
kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE;
kiocb->ki_complete = io_complete_rw_iopoll;
req->iopoll_completed = 0;
} else {