epoch(9) background information?

[Sebastian Huber]

Hello,

I update currently a port of the FreeBSD network stack, etc. to the 
real-time operating system RTEMS from the head version at 2017-04-04 to 
the head version of today. I noticed that some read-write locks are 
replaced by a relatively new stuff called EPOCH(9). Is there some 
background information available for this? The man page is a bit vague 
and searching for something named epoch on the internet is not really 
great. For example, what is the motivation for this change? How is this 
related to read-copy-update (RCU)?

-- 
Sebastian Huber, embedded brains GmbH

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