Re: [PATCH] io_uring: add more uring info to fdinfo for debug

Jens Axboe
2021-09-15T15:32:54Z

On 9/15/21 9:31 AM, Pavel Begunkov wrote:
> On 9/15/21 4:26 PM, Jens Axboe wrote:
>> On 9/13/21 7:08 AM, Hao Xu wrote:
>>> Developers may need some uring info to help themselves debug and address
>>> issues, these info includes sqring/cqring head/tail and the detail
>>> sqe/cqe info, which is very useful when it stucks.
>>
>> I think this is a good addition, more info to help you debug a stuck case
>> is always good. I'll queue this up for 5.16.
>
> Are there limits how much we can print? I remember people were couldn't
> even show a list of CPUs (was it proc?). The overflow list may be huge.

It's using seq_file, so I _think_ we should be fine here. Not sure when/if
it truncates.

--
Jens Axboe