RE: Re: [PATCH v2 RESEND] io_uring/fdinfo: add timeout_list to fdinfo

[Ruyi Zhang <ruyi.zhang@samsung.com>]

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On 25 Sep 2024 12:58 Pavel Begunkov wrote
> On 9/25/24 09:58, Ruyi Zhang wrote:
>> io_uring fdinfo contains most of the runtime information,which is
>> helpful for debugging io_uring applications; However, there is
>> currently a lack of timeout-related information, and this patch adds
>> timeout_list information.

> Please refer to unaddressed comments from v1. We can't have irqs
> disabled for that long. And it's too verbose (i.e. depends on
> the number of timeouts).

Two questions:

1. I agree with you, we shouldn't walk a potentially very long list
under spinlock. but i can't find any other way to get all the timeout
information than to walk the timeout_list. Do you have any good ideas?

2. I also agree seq_printf heavier, if we use seq_put_decimal_ull and
seq_puts to concatenate strings, I haven't tested whether it's more
efficient or not, but the code is certainly not as readable as the
former. It's also possible that I don't fully understand what you mean
and want to hear your opinion.

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Ruyi Zhang