On Thu, 2018-12-13 at 10:56 -0700, Jens Axboe wrote: > Add polled variants of PREAD/PREADV and PWRITE/PWRITEV. These act > like their non-polled counterparts, except we expect to poll for > completion of them. The polling happens at io_getevent() time, and > works just like non-polled IO. > > To setup an io_context for polled IO, the application must call > io_setup2() with IOCTX_FLAG_IOPOLL as one of the flags. It is illegal > to mix and match polled and non-polled IO on an io_context. > > Polled IO doesn't support the user mapped completion ring. Events > must be reaped through the io_getevents() system call. For non-irq > driven poll devices, there's no way to support completion reaping > from userspace by just looking at the ring. The application itself > is the one that pulls completion entries. > > Signed-off-by: Jens Axboe <axboe@xxxxxxxxx> > Looks good to me, thanks. Benny
