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* [PATCH tip/core/rcu 0/17] RCU dyntick updates for v4.16
@ 2017-12-01 19:36 Paul E. McKenney
  2017-12-01 19:36 ` [PATCH tip/core/rcu 01/17] rcu: Avoid ->dynticks_nmi_nesting store tearing Paul E. McKenney
                   ` (16 more replies)
  0 siblings, 17 replies; 18+ messages in thread
From: Paul E. McKenney @ 2017-12-01 19:36 UTC (permalink / raw)
  To: linux-kernel
  Cc: mingo, jiangshanlai, dipankar, akpm, mathieu.desnoyers, josh,
	tglx, peterz, rostedt, dhowells, edumazet, fweisbec, oleg

Hello!

This series includes simplifications of RCU's dyntick-idle processing,
most importantly making use of the the NMI style of processing for
interrupts as well as NMIs.  This series provides a net decrease of more
than 100 lines of code.

1.	Avoid ->dynticks_nmi_nesting store tearing.

2.	Reduce dyntick-idle state space by carefully ordering adjustments
	of nesting and overall state.

3.	Move rcu_nmi_{enter,exit}() to prepare for consolidation.

4.	Clamp ->dynticks_nmi_nesting at eqs entry/exit.  This is required
	to handle the half-interrupts featured by some architectures.
	It used to be handled by the interrupt portion of RCU's
	dyntick-idle processing, which this series is eliminating.
	Thus the clamping must move.

5.	Define rcu_irq_{enter,exit}() in terms of rcu_nmi_{enter,exit}().

6.	Make ->dynticks_nesting be a simple counter, given that it now
	handles only process-level reasons why RCU should be watching.

7.	Eliminate rcu_irq_enter_disabled() because the NMI handling
	already handles the possibility of interruption at any point.

8.	Add tracing to irq/NMI dyntick-idle transitions.

9.	Shrink ->dynticks_{nmi_,}nesting from long long to long because
	there had better not be more than a billion process-level reasons
	why RCU should be watching a given CPU.

10.	Add ->dynticks field to rcu_dyntick trace event.

11.	Stop duplicating lockdep checks in RCU's idle-entry code.

12.	Avoid ->dynticks_nesting store tearing.

13.	Fold rcu_eqs_enter_common() into rcu_eqs_enter() because it is
	now only invoked from that one place.

14.	Fold rcu_eqs_exit_common() into rcu_eqs_exit() because it is now
	only invoked from that one place.

15.	Simplify rcu_eqs_{enter,exit}() non-idle task debug code.

16.	Update dyntick-idle design documentation to reflect NMI/irq
	consolidation.

17.	Remove no longer used trace event rcu_prep_idle, courtesy of
	Steven Rostedt.

								Thanx, Paul

------------------------------------------------------------------------

 Documentation/RCU/Design/Data-Structures/Data-Structures.html |   46 
 include/linux/rcutiny.h                                       |    1 
 include/linux/rcutree.h                                       |    1 
 include/linux/tracepoint.h                                    |    5 
 include/trace/events/rcu.h                                    |   87 -
 kernel/rcu/rcu.h                                              |   31 
 kernel/rcu/tree.c                                             |  466 ++++------
 kernel/rcu/tree.h                                             |    5 
 kernel/rcu/tree_plugin.h                                      |    2 
 kernel/trace/trace.c                                          |   11 
 10 files changed, 256 insertions(+), 399 deletions(-)

^ permalink raw reply	[flat|nested] 18+ messages in thread

end of thread, other threads:[~2017-12-01 19:41 UTC | newest]

Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-12-01 19:36 [PATCH tip/core/rcu 0/17] RCU dyntick updates for v4.16 Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 01/17] rcu: Avoid ->dynticks_nmi_nesting store tearing Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 02/17] rcu: Reduce dyntick-idle state space Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 03/17] rcu: Move rcu_nmi_{enter,exit}() to prepare for consolidation Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 04/17] rcu: Clamp ->dynticks_nmi_nesting at eqs entry/exit Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 05/17] rcu: Define rcu_irq_{enter,exit}() in terms of rcu_nmi_{enter,exit}() Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 06/17] rcu: Make ->dynticks_nesting be a simple counter Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 07/17] rcu: Eliminate rcu_irq_enter_disabled() Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 08/17] rcu: Add tracing to irq/NMI dyntick-idle transitions Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 09/17] rcu: Shrink ->dynticks_{nmi_,}nesting from long long to long Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 10/17] rcu: Add ->dynticks field to rcu_dyntick trace event Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 11/17] rcu: Stop duplicating lockdep checks in RCU's idle-entry code Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 12/17] rcu: Avoid ->dynticks_nesting store tearing Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 13/17] rcu: Fold rcu_eqs_enter_common() into rcu_eqs_enter() Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 14/17] rcu: Fold rcu_eqs_exit_common() into rcu_eqs_exit() Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 15/17] rcu: Simplify rcu_eqs_{enter,exit}() non-idle task debug code Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 16/17] doc: Update dyntick-idle design documentation for NMI/irq consolidation Paul E. McKenney
2017-12-01 19:36 ` [PATCH tip/core/rcu 17/17] tracing, rcu: Remove no longer used trace event rcu_prep_idle Paul E. McKenney

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