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? -- Jens Axboe
