Re: Is it possible to employ epoch to simplify managing prison lifecycle

On 12/16/22, Zhenlei Huang <zlei.huang@gmail.com> wrote:
> Hi,
>
> While hacking `sys/kern/kern_jail.c` I got lost.
>
> There're lots of ref / unref and flags to prevent visit invalid prison
> while
>  concurrent modification is possible and some refs looks weird.
>
> Is it possible to employ epoch(9) to simplify managing of prison lifecycle
> ?
>

Some of the ref/unref cycles are probably avoidable to begin with, but
ultimately the thing to do here is to employ per-cpu reference
counting, if at all needed.

I have a wip patch to provide such a mechanism, it may or may not land
this month.

-- 
Mateusz Guzik <mjguzik gmail.com>