cache: move open to thread pool

[Ka-Hing Cheung]

Hi,

I didn't forget about this. I am pretty swamped at the moment and
there's a holiday freeze coming up. Will get to his in December.

- Ka-Hing

On Thu, Nov 8, 2018 at 6:19 AM Maxim Konovalov <maxim at nginx.com> wrote:
>
> Hi Ka-Hing,
>
> would you mind to test Roman's most recent patches that add
> "aio_open" directive?
>
> http://mailman.nginx.org/pipermail/nginx-devel/2018-November/011538.html
>
> We are looking for overall performance and stability metrics and
> feedback.
>
> Much appreciated,
>
> Maxim
>
> --
> Maxim Konovalov