Re: [PATCH 7/7] io_uring/epoll: add support for IORING_OP_EPOLL_WAIT

[Jens Axboe <axboe@kernel.dk>]

On 2/8/25 5:24 PM, Pavel Begunkov wrote:
> On 2/8/25 23:27, Pavel Begunkov wrote:
> ...
>> But it might be better to just poll the epoll fd, reuse all the
>> io_uring polling machinery, and implement IO_URING_F_MULTISHOT for
>> the epoll opcode.
>>
>> epoll_issue(issue_flags) {
>>      if (!(flags & IO_URING_F_MULTISHOT))
>>          return -EAGAIN;
>>
>>      res = epoll_check_events();
>>      post_cqe(res);
>>      etc.
>> }
>>
>> I think that would make this patch quite trivial, including
>> the multishot mode.
> 
> Something like this instead of the last patch. Completely untested,
> the eventpoll.c hunk is dirty might be incorrect, need to pass the
> right mask for polling, and all that. At least it looks simpler,
> and probably doesn't need half of the prep patches.

I like that idea! I'll roll with it and get it finalized and then do
some testing.

-- 
Jens Axboe