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io_uring: add sockets to list of files that support non-blocking issue

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In chasing a performance issue between using IORING_OP_RECVMSG and
IORING_OP_READV on sockets, tracing showed that we always punt the
socket reads to async offload. This is due to io_file_supports_async()
not checking for S_ISSOCK on the inode. Since sockets supports the
O_NONBLOCK (or MSG_DONTWAIT) flag just fine, add sockets to the list
of file types that we can do a non-blocking issue to.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2019-12-09 20:16:22 -07:00
parent ebfcd8955c
commit 10d5934557
1 changed files with 4 additions and 2 deletions
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6
fs/io_uring.c
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@ -1431,7 +1431,7 @@ static bool io_file_supports_async(struct file *file)
{
umode_t mode = file_inode(file)->i_mode;
if (S_ISBLK(mode) || S_ISCHR(mode))
if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISSOCK(mode))
return true;
if (S_ISREG(mode) && file->f_op != &io_uring_fops)
return true;
@ -1867,7 +1867,9 @@ static int io_write(struct io_kiocb *req, struct io_kiocb **nxt,
goto copy_iov;
}
if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT))
/* file path doesn't support NOWAIT for non-direct_IO */
if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) &&
(req->flags & REQ_F_ISREG))
goto copy_iov;
iov_count = iov_iter_count(&iter);