Re: [RFC] /dev/ioasid uAPI proposal

Jason Wang
2021-06-10T04:04:04Z

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
>>