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

From: Ingo Molnar
Date: Mon Dec 03 2012 - 00:29:01 EST

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* Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxx>, 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
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