Re: Non-reproducible AIO failure

Hi,

On 2025-06-16 14:11:39 +0300, Konstantin Knizhnik wrote:
> One more update: with the proposed patch (memory barrier before
> `ConditionVariableBroadcast` in `pgaio_io_process_completion`

I don't see how that barrier could be required for correctness -
ConditionVariableBroadcast() is a barrier itself (as the comment above the
call notes, too).

On 2025-06-15 14:48:43 +0300, Konstantin Knizhnik wrote:
> Also I think that replacing bitfields with `uint8` and may be even with
> `int`, is good idea at least to avoids false sharing.

I don't think there's false sharing here. And even if there were, the
granularity at which false sharing occurs is a cache line size, so either 64
or 128 byte.

I unfortunately can't repro this issue so far. I don't think it's the same
problem as my patch fixes, so I'll push my patch. How exactly did you
reproduce the probelm?

Greetings,

Andres Freund