RCU commits for 4.7

Hello, Ingo,

The changes in this series include:

1. Documentation updates, including fixes to the design-level
requirements documentation and a fixed version of the design-level data-structure documentation. These fixes include removing cartoons and getting rid of the html/htmlx duplication.

http://lkml.kernel.org/g/[email protected]

2. Further improvements to the new-age expedited grace periods.

	http://lkml.kernel.org/g/[email protected]

3. Miscellaneous fixes.

	http://lkml.kernel.org/g/[email protected]

4. Torture-test changes, including a new rcuperf module for measuring
RCU grace-period performance and scalability, which is useful for the expedited-grace-period changes.

http://lkml.kernel.org/g/[email protected]

All of these changes have been subjected to 0day Test Robot and -next testing, and are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for-mingo

for you to fetch changes up to dcd36d01fb3f99d1d5df01714f6ccbe3fbbaf81f:

Merge branches 'doc.2016.04.19a', 'exp.2016.03.31d', 'fixes.2016.03.31d' and 'torture.2016.04.21a' into HEAD (2016-04-21 13:48:20 -0700)

----------------------------------------------------------------
Anna-Maria Gleixner (1):
rcutorture: Consider FROZEN hotplug notifier transitions

Artem Savkov (1):
rcuperf: Do not wake up shutdown wait queue if "shutdown" is false.

Boqun Feng (1):
rcu: Remove superfluous versions of rcu_read_lock_sched_held()

Paul E. McKenney (53):
rcu: Consolidate dumping of ftrace buffer
documentation: Add real-time requirements from CPU-bound workloads
documentation: Add synchronize_rcu_mult() to the requirements
documentation: Explain why rcu_read_lock() needs no barrier()
documentation: Document illegality of call_rcu() from offline CPUs
documentation: Remove unnecessary images from requirements
documentation: Get rid of duplicate .htmlx file
documentation: Sharpen up the no-readers quick quiz
documentation: Emphasize the call_rcu() is illegal from idle
rcu: Make expedited RCU-sched grace period immediately detect idle
rcu: Make expedited RCU-preempt stall warnings count accurately
rcu: Make cond_resched_rcu_qs() supply RCU-sched expedited QS
rcu: Fix synchronize_rcu_expedited() header comment
rcu: Add event tracing definitions for expedited grace periods
rcu: Add funnel-locking tracing for expedited grace periods
rcu: Add expedited-grace-period event tracing
rcu: Remove expedited GP funnel-lock bypass
rcu: Force boolean subscript for expedited stall warnings
rcu: Shorten expedited_workdone* to exp_workdone*
rcu: Enforce expedited-GP fairness via funnel wait queue
rcu: Add exp_funnel_lock() fastpath
rcu: Consolidate expedited GP code into rcu_exp_wait_wake()
rcu: Consolidate expedited GP tracing into rcu_exp_gp_seq_snap()
rcu: Consolidate expedited GP code into exp_funnel_lock()
rcu: Overlap wakeups with next expedited grace period
rcu: Awaken grace-period kthread when stalled
rcu: Make FQS schedule advance only if FQS happened
rcu: Awaken grace-period kthread if too long since FQS
rcu: Dump ftrace buffer when kicking grace-period kthread
rcutorture: Update scripting to accommodate rcuperf
rcutorture: Allow for rcupdate.rcu_normal
rcutorture: Expedited-GP batch progress access to torturing
rcutorture: Add RCU grace-period performance tests
rcutorture: Documentation for rcuperf kernel parameters
rcutorture: Bind rcuperf reader/writer kthreads to CPUs
rcutorture: Set rcuperf writer kthreads to real-time priority
rcutorture: Print measure of batching efficiency
rcutorture: Make rcuperf collect expedited event-trace data
rcutorture: Make scripts analyze rcuperf trace data, if present
rcutorture: Add rcuperf holdoff boot parameter to reduce interference
rcutorture: Avoid RCU CPU stall warning and RT throttling
rcutorture: Add largish-system rcuperf scenario
rcutorture: Remove redundant initialization to zero
torture: Clarify refusal to run more than one torture test
torture: Kill qemu, not parent process
rcutorture: Convert test duration to seconds early
documentation: Add documentation for RCU's major data structures
rcutorture: Add OS-jitter capability
rcutorture: Don't rebuild identical kernel
rcutorture: Dump trace buffer upon shutdown
rcutorture: Add irqs-disabled test for call_rcu()
rcutorture: Add boot-time adjustment of leaf fanout
Merge branches 'doc.2016.04.19a', 'exp.2016.03.31d', 'fixes.2016.03.31d' and 'torture.2016.04.21a' into HEAD

Yao Dongdong (1):
documentation: Make sample code and documentation consistent

 .../Design/Data-Structures/BigTreeClassicRCU.svg   |  474 ++++
 .../Design/Data-Structures/BigTreeClassicRCUBH.svg |  499 ++++
 .../Data-Structures/BigTreeClassicRCUBHdyntick.svg |  695 +++++
 .../Data-Structures/BigTreePreemptRCUBHdyntick.svg |  741 ++++++
 .../BigTreePreemptRCUBHdyntickCB.svg               |  858 ++++++
 .../Design/Data-Structures/Data-Structures.html    | 1333 ++++++++++
 .../Design/Data-Structures/HugeTreeClassicRCU.svg  |  939 +++++++
 .../RCU/Design/Data-Structures/TreeLevel.svg       |  828 ++++++
 .../RCU/Design/Data-Structures/TreeMapping.svg     |  305 +++
 .../Design/Data-Structures/TreeMappingLevel.svg    |  380 +++
 .../RCU/Design/Data-Structures/blkd_task.svg       |  843 ++++++
 .../RCU/Design/Data-Structures/nxtlist.svg         |  396 +++
 .../RCU/Design/Requirements/2013-08-is-it-dead.png |  Bin 100825 -> 0 bytes
 .../RCU/Design/Requirements/RCUApplicability.svg   |  237 --
 .../RCU/Design/Requirements/Requirements.html      |  941 ++++---
 .../RCU/Design/Requirements/Requirements.htmlx     | 2741 --------------------
 Documentation/RCU/Design/htmlqqz.sh                |  108 -
 Documentation/RCU/trace.txt                        |   10 +-
 Documentation/RCU/whatisRCU.txt                    |   22 +-
 Documentation/kernel-parameters.txt                |   38 +
 include/linux/rcupdate.h                           |   30 +-
 include/linux/rcutiny.h                            |   16 +
 include/linux/rcutree.h                            |    2 +
 include/trace/events/rcu.h                         |   79 +-
 kernel/rcu/Makefile                                |    1 +
 kernel/rcu/rcuperf.c                               |  655 +++++
 kernel/rcu/rcutorture.c                            |   29 +-
 kernel/rcu/tree.c                                  |  302 ++-
 kernel/rcu/tree.h                                  |   20 +-
 kernel/rcu/tree_plugin.h                           |   37 +-
 kernel/rcu/tree_trace.c                            |   13 +-
 kernel/rcu/update.c                                |    4 +-
 kernel/torture.c                                   |    4 +-
 lib/Kconfig.debug                                  |   33 +
 tools/testing/selftests/rcutorture/bin/jitter.sh   |   90 +
 .../rcutorture/bin/kvm-recheck-rcuperf-ftrace.sh   |  121 +
 .../rcutorture/bin/kvm-recheck-rcuperf.sh          |   96 +
 .../selftests/rcutorture/bin/kvm-recheck.sh        |    5 +-
 .../selftests/rcutorture/bin/kvm-test-1-run.sh     |   59 +-
 tools/testing/selftests/rcutorture/bin/kvm.sh      |   24 +-
 .../selftests/rcutorture/configs/rcu/TREE04        |    2 +-
 .../selftests/rcutorture/configs/rcu/TREE04.boot   |    2 +-
 .../selftests/rcutorture/configs/rcuperf/CFLIST    |    1 +
 .../selftests/rcutorture/configs/rcuperf/CFcommon  |    2 +
 .../selftests/rcutorture/configs/rcuperf/TREE      |   20 +
 .../selftests/rcutorture/configs/rcuperf/TREE54    |   23 +
 .../rcutorture/configs/rcuperf/ver_functions.sh    |   52 +
 47 files changed, 10417 insertions(+), 3693 deletions(-)
 create mode 100644 Documentation/RCU/Design/Data-Structures/BigTreeClassicRCU.svg
 create mode 100644 Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBH.svg
 create mode 100644 Documentation/RCU/Design/Data-Structures/BigTreeClassicRCUBHdyntick.svg
 create mode 100644 Documentation/RCU/Design/Data-Structures/BigTreePreemptRCUBHdyntick.svg
 create mode 100644 Documentation/RCU/Design/Data-Structures/BigTreePreemptRCUBHdyntickCB.svg
 create mode 100644 Documentation/RCU/Design/Data-Structures/Data-Structures.html
 create mode 100644 Documentation/RCU/Design/Data-Structures/HugeTreeClassicRCU.svg
 create mode 100644 Documentation/RCU/Design/Data-Structures/TreeLevel.svg
 create mode 100644 Documentation/RCU/Design/Data-Structures/TreeMapping.svg
 create mode 100644 Documentation/RCU/Design/Data-Structures/TreeMappingLevel.svg
 create mode 100644 Documentation/RCU/Design/Data-Structures/blkd_task.svg
 create mode 100644 Documentation/RCU/Design/Data-Structures/nxtlist.svg
 delete mode 100644 Documentation/RCU/Design/Requirements/2013-08-is-it-dead.png
 delete mode 100644 Documentation/RCU/Design/Requirements/RCUApplicability.svg
 delete mode 100644 Documentation/RCU/Design/Requirements/Requirements.htmlx
 delete mode 100755 Documentation/RCU/Design/htmlqqz.sh
 create mode 100644 kernel/rcu/rcuperf.c
 create mode 100755 tools/testing/selftests/rcutorture/bin/jitter.sh
 create mode 100755 tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf-ftrace.sh
 create mode 100755 tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf.sh
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcuperf/CFLIST
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcuperf/CFcommon
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcuperf/TREE
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcuperf/TREE54
 create mode 100644 tools/testing/selftests/rcutorture/configs/rcuperf/ver_functions.sh

Pulled, thanks a lot Paul!

Ingo