Re: [RFC] /dev/ioasid uAPI proposal

Jason Wang
2021-06-10T02:00:33Z

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.

>
> 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
>