[PATCH tip/core/rcu 0/3] Parallelize expedited grace periods for v4.18

From: Paul E. McKenney
Date: Sun Apr 22 2018 - 22:20:07 EST


This series parallelizes grace-period initialization for expedited
grace periods and adds a couple of fixes:

1. Parallelize expedited grace-period initialization in order to
reduce the growth of latency with increasing numbers of CPUs.

2. Updates comments on which locks are to be held to match the
code, courtesy of Boqun Feng.

3. Protect all calls to sync_rcu_preempt_exp_done() with the
corresponding rcu_node structure's ->lock held, courtesy of
Boqun Feng.

Thanx, Paul


rcu.h | 1
tree.c | 3
tree.h | 10 ++
tree_exp.h | 222 ++++++++++++++++++++++++++++++++++++-------------------------
4 files changed, 148 insertions(+), 88 deletions(-)