tree d8aafd4c5843461efe75d631d2a5660fb7ba1f77
parent 4cad5591fc03b61a017fb58f74497e613f3af359
author Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1517551538 -0800
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1519345758 -0800

rcu: Parallelize expedited grace-period initialization

The latency of RCU expedited grace periods grows with increasing numbers
of CPUs, eventually failing to be all that expedited.  Much of the growth
in latency is in the initialization phase, so this commit uses workqueues
to carry out this initialization concurrently on a rcu_node-by-rcu_node
basis.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>