Re: [RFC] /dev/ioasid uAPI proposal

Jason Wang
2021-06-02T08:54:43Z

在 2021/6/2 上午1:31, Jason Gunthorpe 写道:
> On Tue, Jun 01, 2021 at 04:47:15PM +0800, Jason Wang wrote:
>
>> We can open up to ~0U file descriptors, I don't see why we need to restrict
>> it in uAPI.
> There are significant problems with such large file descriptor
> tables. High FD numbers man things like select don't work at all
> anymore and IIRC there are more complications.

I don't see how much difference for IOASID and other type of fds. People
can choose to use poll or epoll.

And with the current proposal, (assuming there's a N:1 ioasid to
ioasid). I wonder how select can work for the specific ioasid.

Thanks

>
> A huge number of FDs for typical usages should be avoided.
>
> Jason
>