Hello! This series provides energy efficiency for nearly-idle systems by making call_rcu() more lazy. Several NOCB changes come along for the ride: 1. Simplify rcu_init_nohz() cpumask handling, courtesy of Zhen Lei. 2. Fix late wakeup when flush of bypass cblist happens, courtesy of "Joel Fernandes (Google)". 3. Fix missing nocb gp wake on rcu_barrier(), courtesy of Frederic Weisbecker. 4. Make call_rcu() lazy to save power, courtesy of "Joel Fernandes (Google)". 5. Refactor code a bit in rcu_nocb_do_flush_bypass(), courtesy of "Joel Fernandes (Google)". 6. Shrinker for lazy rcu, courtesy of Vineeth Pillai. 7. Add laziness and kfree tests, courtesy of "Joel Fernandes (Google)". 8. percpu-refcount: Use call_rcu_flush() for atomic switch, courtesy of "Joel Fernandes (Google)". 9. Use call_rcu_flush() instead of call_rcu, courtesy of "Joel Fernandes (Google)". 10. Use call_rcu_flush() for async reader test, courtesy of "Joel Fernandes (Google)". 11. Use call_rcu_flush() where needed, courtesy of "Joel Fernandes (Google)". 12. scsi/scsi_error: Use call_rcu_flush() instead of call_rcu(), courtesy of Uladzislau Rezki. 13. Make queue_rcu_work() use call_rcu_flush(), courtesy of Uladzislau Rezki. 14. Use call_rcu_flush() instead of call_rcu(), courtesy of "Joel Fernandes (Google)". Thanx, Paul ------------------------------------------------------------------------ b/drivers/scsi/scsi_error.c | 2 b/include/linux/rcupdate.h | 9 + b/kernel/rcu/Kconfig | 8 + b/kernel/rcu/rcu.h | 8 + b/kernel/rcu/rcuscale.c | 68 +++++++++++- b/kernel/rcu/rcutorture.c | 16 +- b/kernel/rcu/sync.c | 2 b/kernel/rcu/tiny.c | 2 b/kernel/rcu/tree.c | 11 + b/kernel/rcu/tree.h | 1 b/kernel/rcu/tree_exp.h | 2 b/kernel/rcu/tree_nocb.h | 34 +----- b/kernel/workqueue.c | 2 b/lib/percpu-refcount.c | 3 b/net/rxrpc/conn_object.c | 2 kernel/rcu/rcuscale.c | 2 kernel/rcu/tree.c | 129 +++++++++++++++-------- kernel/rcu/tree.h | 11 + kernel/rcu/tree_nocb.h | 243 ++++++++++++++++++++++++++++++++++++-------- 19 files changed, 424 insertions(+), 131 deletions(-)
