Re: [RFC] /dev/ioasid uAPI proposal

[Jason Wang]

在 2021/6/10 上午10:00, Jason Wang 写道:
> 在 2021/6/8 下午9:20, Jason Gunthorpe 写道:
> > On Tue, Jun 08, 2021 at 09:10:42AM +0800, Jason Wang wrote:
> >
> > > Well, this sounds like a re-invention of io_uring which has already 
> > > worked
> > > for multifds.
> > How so? io_uring is about sending work to the kernel, not getting
> > structued events back?
>
>
> Actually it can. Userspace can poll multiple fds via preparing 
> multiple sqes with IORING_OP_ADD flag.


IORING_OP_POLL_ADD actually.

Thanks


> > It is more like one of the perf rings
>
>
> This means another ring and we need introduce ioctl() to add or remove 
> ioasids from the poll. And it still need a kind of fallback like a 
> list if the ring is full.
>
> Thanks
>
>
> > Jason