RCU

http://blog.csdn.net/dog250/article/details/5303424



##pre-ergo
There a lot of subsytem, code segments use RCU in their implement.
It's really need to know the truth of RCU before understanding linux kernel.


##history of RCU
old fasion rcu
premtiable rcu
tree-rcu


##Design pattern
 
In this article, the paragraph RCV OVERVIEW is the very clearly explaination of RCU. You should understand, I think, a grace period is start at removing the old data(maybe leading by rcu_assign_pointer) !!!


##WFF

##FAQ
In classical RCU, if the entry will be deleted has a previous pointer?

RCU callback function