On Tue, 2018-12-18 at 06:27 -0700, Jens Axboe wrote: > On 12/18/18 3:32 AM, Benny Halevy wrote: > > 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. > > Is that a reviewed-by? > Yes. Reviewed-by: Benny Halevy <bhalevy@xxxxxxxxxxxx>
