Re: [RFC] /dev/ioasid uAPI proposal

[Jason Wang]

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