Re: [GIT PULL rcu/next] RCU commits for 3.8

[Ingo Molnar <mingo@kernel.org>]

* Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:

> Hello, Ingo,
> 
> The major features of this series are:
> 
> 1.	A first version of no-callbacks CPUs.  This version prohibits
> 	offlining CPU 0, but only when enabled via CONFIG_RCU_NOCB_CPU=y.
> 	Relaxing this constraint is in progress, but not yet ready
> 	for prime time.  These commits were posted to LKML at
> 	https://lkml.org/lkml/2012/10/30/724, and are at branch rcu/nocb.
> 
> 2.	Changes to SRCU that allows statically initialized srcu_struct
> 	structures.  These commits were posted to LKML at
> 	https://lkml.org/lkml/2012/10/30/296, and are at branch rcu/srcu.
> 
> 3.	Restructuring of RCU's debugfs output.  These commits were posted
> 	to LKML at https://lkml.org/lkml/2012/10/30/341, and are at
> 	branch rcu/tracing.
> 
> 4.	Additional CPU-hotplug/RCU improvements, posted to LKML at
> 	https://lkml.org/lkml/2012/10/30/327, and are at branch rcu/hotplug.
> 	Note that the commit eliminating __stop_machine() was judged to
> 	be too-high of risk, so is deferred to 3.9.
> 
> 5.	Changes to RCU's idle interface, most notably a new module
> 	parameter that redirects normal grace-period operations to
> 	their expedited equivalents.  These were posted to LKML at
> 	https://lkml.org/lkml/2012/10/30/739, and are at branch rcu/idle.
> 
> 6.	Additional diagnostics for RCU's CPU stall warning facility,
> 	posted to LKML at https://lkml.org/lkml/2012/10/30/315, and
> 	are at branch rcu/stall.  The most notable change reduces the
> 	default RCU CPU stall-warning time from 60 seconds to 21 seconds,
> 	so that it once again happens sooner than the softlockup timeout.
> 
> 7.	Documentation updates, which were posted to LKML at
> 	https://lkml.org/lkml/2012/10/30/280, and are at branch rcu/doc.
> 	A couple of late-breaking changes were posted at
> 	https://lkml.org/lkml/2012/11/16/634 and
> 	https://lkml.org/lkml/2012/11/16/547.
> 
> 8.	Miscellaneous fixes, which were posted to LKML at
> 	https://lkml.org/lkml/2012/10/30/309, along with a late-breaking
> 	change posted at Fri, 16 Nov 2012 11:26:25 -0800 with message-ID
> 	<20121116192625.GA447@linux.vnet.ibm.com>, but which lkml.org
> 	seems to have missed.  These are at branch rcu/fixes.
> 
> 9.	Finally, a fix for an lockdep-RCU splat was posted to LKML
> 	at https://lkml.org/lkml/2012/11/7/486.  This is at rcu/next.
> 
> All executable code in these commits have been subject to -next testing.
> (Fixes to trailing whitespace problems in one of the Documentation files
> has not yet been, but as far as I know -next testing does not do anything
> with Documentation files -- and testing will happen as soon as -next testing
> restarts.)
> 
> These changes are available in the git repository at:
>   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
> 
> 							Thanx, Paul
> 
> ------------------>
> Antti P Miettinen (1):
>       rcu: Add a module parameter to force use of expedited RCU primitives
> 
> Dhaval Giani (1):
>       rcu: Correct the name of a reference in list of RCU papers
> 
> Eric Dumazet (1):
>       rcu: Fix batch-limit size problem
> 
> Frederic Weisbecker (2):
>       rcu: Remove rcu_switch()
>       rcu: Fix unrecovered RCU user mode in syscall_trace_leave()
> 
> Kees Cook (1):
>       rcu: Update docs to include kfree_rcu()
> 
> Lai Jiangshan (4):
>       srcu: Credit Lai Jiangshan with SRCU rewrite
>       srcu: Export process_srcu()
>       srcu: Add DEFINE_SRCU()
>       rcutorture: Use DEFINE_STATIC_SRCU()
> 
> Michael Wang (12):
>       rcu: Create directory for each flavor of rcu
>       rcu: Fundamental facility for 'CPU units sequence reading'
>       rcu: Optimize the 'rcudata' for RCU trace
>       rcu: Optimize the 'rcudata.csv' for RCU trace
>       rcu: Optimize the 'rcu_pending' for RCU trace
>       rcu: Replace the old interface with the new one
>       rcu: Remove the interface "rcudata.csv"
>       rcu: split 'rcubarrier' to each flavor
>       rcu: split 'rcuboost' to each flavor
>       rcu: split 'rcugp' to each flavor
>       rcu: split 'rcuhier' to each flavor
>       rcu: Remove old debugfs interfaces and also RCU flavor name
> 
> Paul E. McKenney (27):
>       rcu: Accelerate callbacks for CPU initiating a grace period
>       Documentation: Fix memory-barriers.txt example
>       rcu: Fix comment about _rcu_barrier()/orphanage exclusion
>       rcu: Make rcutorture give diagnostics if CPU offline fails
>       rcu: Update RCU_FAST_NO_HZ help text
>       rcu: Fix precedence error in cpu_needs_another_gp()
>       rcu: Print remote CPU's stacks in stall warnings
>       rcu: Add grace-period information to RCU CPU stall warnings
>       rcu: Dump number of callbacks in stall warning messages
>       rcu: Document alternative RCU/reference-count algorithms
>       rcu: Rename ->onofflock to ->orphan_lock
>       rcu: Avoid counter wrap in synchronize_sched_expedited()
>       rcu: Move synchronize_sched_expedited() state to rcu_state
>       rcu: Instrument synchronize_rcu_expedited() for debugfs tracing
>       rcu: Fix tracing formatting
>       rcu: Add tracing for synchronize_sched_expedited()
>       rcu: Remove list_for_each_continue_rcu()
>       rcu: Add new rcutorture module parameters to start/end test messages
>       rcu: Clarify memory-ordering properties of grace-period primitives
>       rcu: Fix TINY_RCU rcu_is_cpu_rrupt_from_idle check
>       rcu: Reduce default RCU CPU stall warning timeout
>       rcu: Update documentation for TREE_RCU debugfs tracing
>       rcu: Add documentation for the new rcuexp debugfs trace file
>       Merge branches 'urgent.2012.10.27a', 'doc.2012.11.16a', 'fixes.2012.11.13a', 'srcu.2012.10.27a', 'stall.2012.11.13a', 'tracing.2012.11.08a' and 'idle.2012.10.24a' into HEAD
>       rcu: Add callback-free CPUs
>       rcu: Separate accounting of callbacks from callback-free CPUs
>       sched: Mark RCU reader in sched_show_task()
> 
> Paul Gortmaker (1):
>       rcu: Wordsmith help text for RCU_USER_QS kernel parameter
> 
>  Documentation/RCU/RTFP.txt          |    2 +-
>  Documentation/RCU/checklist.txt     |   17 +-
>  Documentation/RCU/listRCU.txt       |    2 +-
>  Documentation/RCU/rcuref.txt        |   61 +++++-
>  Documentation/RCU/trace.txt         |  396 ++++++++++++++++++---------------
>  Documentation/RCU/whatisRCU.txt     |   17 +-
>  Documentation/kernel-parameters.txt |   21 ++
>  Documentation/memory-barriers.txt   |    9 +-
>  arch/um/drivers/mconsole_kern.c     |    2 +-
>  arch/x86/kernel/ptrace.c            |    7 +
>  include/linux/rculist.h             |   17 --
>  include/linux/rcupdate.h            |   27 +++
>  include/linux/sched.h               |   10 +-
>  include/linux/srcu.h                |   34 +++
>  include/trace/events/rcu.h          |    1 +
>  init/Kconfig                        |   41 +++-
>  kernel/ksysfs.c                     |   18 ++
>  kernel/rcu.h                        |    2 +
>  kernel/rcupdate.c                   |    3 +
>  kernel/rcutiny.c                    |    2 +-
>  kernel/rcutiny_plugin.h             |    5 +-
>  kernel/rcutorture.c                 |   54 ++---
>  kernel/rcutree.c                    |  283 ++++++++++++++++++------
>  kernel/rcutree.h                    |   67 ++++++-
>  kernel/rcutree_plugin.h             |  415 ++++++++++++++++++++++++++++++++++-
>  kernel/rcutree_trace.c              |  330 ++++++++++++++--------------
>  kernel/sched/core.c                 |   14 +-
>  kernel/srcu.c                       |   16 +-
>  lib/Kconfig.debug                   |    2 +-
>  29 files changed, 1352 insertions(+), 523 deletions(-)

Pulled into tip:core/rcu, thanks a lot Paul!

There was a minor conflict in arch/x86/kernel/ptrace.c that I've 
resolved.

Thanks,

	Ingo