[PATCH tip/core/rcu 0/44] Torture-test changes for 3.16

["Paul E. McKenney" <paulmck@linux.vnet.ibm.com>]

Hello!

This series provides torture-test updates:

1.	Add forward-progress checking to distinguish between stalls in
	the RCU implementation and in the torture test itself.

2.	Remove the --builddir and --relbuilddir options, which have been
	obsoleted by the parallel testing facility.

3.	Make "--dryrun sched" output more readable by clearly indicating
	where each batch of concurrent runs starts.

4.	Make torture-test errors less RCU-specific.  ("Hey, why did
	my locktorture run complain about RCU???")

5,8-14.	Rename variables to reflect the new RCU-independence of a number
	of the torture-test scripts.

6.	Reduce locktorture sleeping to increase intensity.

7.	Add a --defconfig argument to allow other default configs to
	be specified.

15.	Make config-fragment filtering RCU-independent.

16.	Mark private functions as static in kernel/rcu/torture.c,
	courtesy of Rashika Kheria.

17-18.	Make the output of "--dryrun script" independently runnable.

19.	Print negative numbers when SRCU counters wrap instead of
	huge 64-bit integers.

20.	Fix "Stopping" torture messages.

21.	Report any diagnostics issued by qemu.

22.	Make kthreads spin during the last jiffy of a stutter period
	to increase the intensity of torture stop-start events.

23.	Permit multiple qemu and boot arguments to be specified on
	the command line.

24.	Choose bzImage location based on architecture.

25.	Add tracing-enabled variant of TREE02 to aid debugging.

26.	Dump the ftrace buffer when the RCU grace period stalls.

27.	Export the RCU grace-period kthread wait state to rcutorture
	to ease diagnosis of RCU grace-period stalls.

28.	Fix bug in raw_cpu_inc_return().

29.	Make cond_resched() report RCU quiescent states.

30.	Make rcu_torture_reader() use cond_resched() instead of
	unconditionally invoking schedule().

31.	Complain if an all-zero cpumask is specified during a torture
	shuffle operation, courtesy of Iulia Manda.

32.	Make build failures more evident.

33.	Capture and report the torture_create_kthread() return value when
	creating the rcu_torture_fqs kthread.

34.	Use elapsed time to detect hangs rather than counting "sleep 1"
	commands.

35.	Rearrange config fragments to ensure that RCU-sched primitives are
	tested in TREE_PREEMPT_RCU kernels.

36.	Add rcutorture tests for get_state_synchronize_rcu() and
	cond_synchronize_rcu().

37.	Add explicit tests for synchronous grace-period primitives.

38.	Add missing destroy_timer_on_stack(), courtesy of Thomas Gleixner.

39.	Make scripts record "git diff HEAD" to ease reproduction of
	an unexpected torture-test result.

40.	Run rcu_torture_writer() at normal priority.

41.	Put the qemu process into the background to better handle
	kernel hangs.

42.	Remove reference to a non-existent Kconfig parameter.

43.	Refuse to run multiple concurrent torture tests.

44.	Remove __init from torture_init_begin() and torture_init_end()
	to allow rcutorture to once again work as a loadable module.

45.	Remove unused torture_parm() macro.

							Thanx, Paul

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

 b/include/linux/percpu.h                                     |    2 
 b/include/linux/rcupdate.h                                   |   19 +
 b/include/linux/rcutiny.h                                    |    4 
 b/include/linux/rcutree.h                                    |    1 
 b/include/linux/torture.h                                    |    2 
 b/kernel/locking/locktorture.c                               |    3 
 b/kernel/rcu/rcutorture.c                                    |   37 ++
 b/kernel/rcu/tree.c                                          |   18 +
 b/kernel/rcu/tree.h                                          |    8 
 b/kernel/rcu/update.c                                        |   18 +
 b/kernel/sched/core.c                                        |    7 
 b/kernel/torture.c                                           |    5 
 b/tools/testing/selftests/rcutorture/bin/configinit.sh       |    2 
 b/tools/testing/selftests/rcutorture/bin/functions.sh        |   12 
 b/tools/testing/selftests/rcutorture/bin/kvm-build.sh        |    2 
 b/tools/testing/selftests/rcutorture/bin/kvm-recheck-lock.sh |    2 
 b/tools/testing/selftests/rcutorture/bin/kvm-recheck-rcu.sh  |    2 
 b/tools/testing/selftests/rcutorture/bin/kvm-recheck.sh      |    2 
 b/tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh   |    2 
 b/tools/testing/selftests/rcutorture/bin/kvm.sh              |   16 
 b/tools/testing/selftests/rcutorture/bin/parse-torture.sh    |  106 ++++++
 b/tools/testing/selftests/rcutorture/configs/rcu/TREE02-T    |   25 +
 b/tools/testing/selftests/rcutorture/configs/rcu/TREE08.boot |    1 
 include/linux/rcupdate.h                                     |   36 ++
 include/linux/torture.h                                      |    6 
 kernel/locking/locktorture.c                                 |    7 
 kernel/rcu/rcutorture.c                                      |  193 +++++++----
 kernel/rcu/tree.c                                            |   17 
 kernel/torture.c                                             |   36 +-
 tools/testing/selftests/rcutorture/bin/functions.sh          |   35 +
 tools/testing/selftests/rcutorture/bin/kvm-build.sh          |    4 
 tools/testing/selftests/rcutorture/bin/kvm-recheck.sh        |   24 +
 tools/testing/selftests/rcutorture/bin/kvm-test-1-run.sh     |   44 +-
 tools/testing/selftests/rcutorture/bin/kvm.sh                |  162 +++++----
 tools/testing/selftests/rcutorture/bin/parse-rcutorture.sh   |  106 ------
 35 files changed, 649 insertions(+), 317 deletions(-)