Paul E. McKenney f92c734f02 rcu: Prevent rcu_barrier() from starting needless grace periods ...

Currently rcu_barrier() uses call_rcu() to enqueue new callbacks
on each CPU with a non-empty callback list.  This works, but means
that rcu_barrier() forces grace periods that are not otherwise needed.
The key point is that rcu_barrier() never needs to wait for a grace
period, but instead only for all pre-existing callbacks to be invoked.
This means that rcu_barrier()'s new callbacks should be placed in
the callback-list segment containing the last pre-existing callback.

This commit makes this change using the new rcu_segcblist_entrain()
function.

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

2017-06-08 08:25:22 -07:00

..

events

rcu: Prevent rcu_barrier() from starting needless grace periods

2017-06-08 08:25:22 -07:00

define_trace.h

tracing: Introduce TRACE_EVENT_FN_COND macro

2015-12-23 14:27:21 -05:00

perf.h

tracing: Use outer () on __get_str() definition

2016-07-15 15:50:58 -04:00

syscall.h

tracing: Rename ftrace_event_{call,class} to trace_event_{call,class}

2015-05-13 14:06:10 -04:00

trace_events.h

tracing: add __print_flags_u64()

2017-02-22 16:41:26 -08:00