Allow faster eventhandler dispatching by keeping pointers to handler lists.

[Matt Joras]

On 10/28/2017 19:19, Ian Lepore wrote:
> There has been some talk lately of the kernel eventhandler mechanism
> being inefficient due to holding a lock while walking a global list
> doing strcmp() to find the right list of handlers.  I've posted a
> phabricator review to alleviate that by allowing high-frequency events
> to pre-define the event list and keep a pointer to it, to avoid the
> name lookups.
>
> https://reviews.freebsd.org/D12821
>
> -- Ian
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Hah, as it happens I just posted a revision with largely the same
intention, though I approached the problem a bit differently:
https://reviews.freebsd.org/D12814.

Matt