v6 version of RCU lazy patches based on rcu/next branch. To facilitate easier merge, I dropped tracing and other patches and just implemented the new changes. I will post the tracing patches later along with rcutop as I need to add new tracepoints that Frederic suggested. Main changes: 1. rcu_barrier() wake up only for lazy bypass list. 2. Make all call_rcu() default-lazy and add call_rcu_flush() API. 3. Take care of some callers using call_rcu_flush() API. I am seeing good performance and power with these patches on real ChromeOS x86 asymmetric hardware. v5 cover letter is here: https://lore.kernel.org/all/20220901221720.1105021-1-joel@xxxxxxxxxxxxxxxxx/ Joel Fernandes (Google) (3): rcu: Make call_rcu() lazy to save power rcuscale: Add laziness and kfree tests percpu-refcount: Use call_rcu_flush() for atomic switch Vineeth Pillai (1): rcu: shrinker for lazy rcu include/linux/rcupdate.h | 7 ++ kernel/rcu/Kconfig | 8 ++ kernel/rcu/rcu.h | 8 ++ kernel/rcu/rcuscale.c | 65 ++++++++++- kernel/rcu/tiny.c | 2 +- kernel/rcu/tree.c | 133 ++++++++++++++-------- kernel/rcu/tree.h | 17 ++- kernel/rcu/tree_exp.h | 2 +- kernel/rcu/tree_nocb.h | 236 +++++++++++++++++++++++++++++++++------ lib/percpu-refcount.c | 3 +- 10 files changed, 395 insertions(+), 86 deletions(-) -- 2.37.3.998.g577e59143f-goog
