* Paul E. McKenney <paul...@linux.vnet.ibm.com> wrote:
> Hello, Ingo,
>
> This is now an RFC pull for only one of the previous two reasons.
> The commits have how been through -next without the adaptive-idle patches,
> but although good progress has been made on the adaptive-idle patches,
> they are still not quite there yet. Again, the current adaptive-idle
> series has been rebased as rcu/idle on top of rcu/next, the latter branch
> being the subject of this pull request. Also, I have merged the
> conflicting -tip branches into rcu/next, resolving the conflicts.
> (One set was adjacent insertions/deletions, the other was resolved
> as Peter Zijlstra described at https://lkml.org/lkml/2012/9/5/585.
>
> Again, the major features of this series are:
>
> 0. A fix for a latent bug that has been in RCU ever since the
> addition of CPU stall warnings. This bug results in
> false-positive stall warnings, but thus far only on embedded
> systems with severely cut-down userspace configurations.
> This fix is located on an rcu/urgent branch, with the rest
> of the commits based on top of it. This commit CCs stable.
> Given that the merge window is coming quite soon and given
> the small number of affected users, I do -not- recommend
> pushing it to 3.6, but the separate branch makes it easy to
> find if someone needs it.
>
> 1. Further reductions in latency spikes for huge systems, along
> with additional boot-time adaptation to the actual hardware.
> This is a large change, as it moves RCU grace-period
> initialization and cleanup, along with quiescent-state forcing,
> from softirq to a kthread. However, it appears to be in
> quite good shape (famous last words). Posted to LKML at
> https://lkml.org/lkml/2012/9/20/427.
>
> 2. Updates to documentation and rcutorture, the latter category
> including keeping statistics on CPU-hotplug latencies and
> fixing some initialization-time races. Posted to LKML at
> https://lkml.org/lkml/2012/8/30/193.
>
> 3. Miscellaneous fixes and improvements, posted to LKML at
> https://lkml.org/lkml/2012/8/30/199.
>
> 4. CPU-hotplug fixes and improvements, posted to LKML at
> https://lkml.org/lkml/2012/8/30/292 for first three and at
> https://lkml.org/lkml/2012/8/3/416.
>
> 5. Idle-loop fixes that were omitted on an earlier submission,
> posted to LKML at https://lkml.org/lkml/2012/8/30/251.
>
> As noted earlier, all of these commits have been exposed to -next testing,
> albeit in combination with adaptive-idle commits that will hopefully be
> following soon.
>
> 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
>
> -------------------->
> Dimitri Sivanich (1):
> rcu: Segregate rcu_state fields to improve cache locality
>
> Frederic Weisbecker (11):
> alpha: Fix preemption handling in idle loop
> alpha: Add missing RCU idle APIs on idle loop
> cris: Add missing RCU idle APIs on idle loop
> frv: Add missing RCU idle APIs on idle loop
> h8300: Add missing RCU idle APIs on idle loop
> m32r: Add missing RCU idle APIs on idle loop
> m68k: Add missing RCU idle APIs on idle loop
> mn10300: Add missing RCU idle APIs on idle loop
> parisc: Add missing RCU idle APIs on idle loop
> score: Add missing RCU idle APIs on idle loop
> xtensa: Add missing RCU idle APIs on idle loop
>
> Li Zhong (1):
> rcu: Move TINY_RCU quiescent state out of extended quiescent state
>
> Michael Wang (1):
> kmemleak: Replace list_for_each_continue_rcu with new interface
>
> Paul E. McKenney (46):
> rcu: Move RCU grace-period initialization into a kthread
> rcu: Prevent initialization-time quiescent-state race
> rcu: Allow RCU grace-period initialization to be preempted
> rcu: Move RCU grace-period cleanup into kthread
> rcu: Allow RCU grace-period cleanup to be preempted
> rcu: Break up rcu_gp_kthread() into subfunctions
> rcu: Prevent offline CPUs from executing RCU core code
> rcu: Provide OOM handler to motivate lazy RCU callbacks
> rcu: Move quiescent-state forcing into kthread
> rcu: Allow RCU quiescent-state forcing to be preempted
> rcu: Adjust debugfs tracing for kthread-based quiescent-state forcing
> rcu: Prevent force_quiescent_state() memory contention
> rcu: Control grace-period duration from sysfs
> rcu: Make rcutree module parameters visible in sysfs
> rcu: Fix day-zero grace-period initialization/cleanup race
> rcu: Add random PROVE_RCU_DELAY to grace-period initialization
> rcu: Adjust for unconditional ->completed assignment
> rcu: Eliminate signed overflow in synchronize_rcu_expedited()
> rcu: Reduce synchronize_rcu_expedited() latency
> rcu: Simplify quiescent-state detection
> rcu: Handle unbalanced rcu_node configurations with few CPUs
> rcu: Shrink RCU based on number of CPUs
> rcu: Update rcutorture defaults
> rcu: Track CPU-hotplug duration statistics
> rcu: Document SRCU dead-CPU capabilities, emphasize read-side limits
> rcu: Switch rcutorture to pr_alert() and friends
> rcu: Prevent initialization race in rcutorture kthreads
> rcu: Add PROVE_RCU_DELAY to provoke difficult races
> rcu: Pull TINY_RCU dyntick-idle tracing into non-idle region
> rcu: Properly initialize ->boost_tasks on CPU offline
> rcu: Permit RCU_NONIDLE() to be used from interrupt context
> rcu: Improve boost selection when moving tasks to root rcu_node
> rcu: Make offline-CPU checking allow for indefinite delays
> rcu: Fix obsolete rcu_initiate_boost() header comment
> rcu: Apply for_each_rcu_flavor() to increment_cpu_stall_ticks()
> rcu: Avoid rcu_print_detail_task_stall_rnp() segfault
> rcu: Protect rcu_node accesses during CPU stall warnings
> rcu: Avoid spurious RCU CPU stall warnings
> rcu: Remove redundant memory barrier from __call_rcu()
> rcu: Move TINY_PREEMPT_RCU away from raw_local_irq_save()
> time: RCU permitted to stop idle entry via softirq
> rcu: Fix CONFIG_RCU_FAST_NO_HZ stall warning message
> rcu: Remove _rcu_barrier() dependency on __stop_machine()
> rcu: Disallow callback registry on offline CPUs
> ia64: Add missing RCU idle APIs on idle loop
> Merge branches 'bigrt.2012.09.23a', 'doctorture.2012.09.23a',
> 'fixes.2012.09.23a', 'hotplug.2012.09.23a' and 'idlechop.2012.09.23a' into
> HEAD
>
> Peter Zijlstra (1):
> sched: Fix load avg vs cpu-hotplug
>
> Silas Boyd-Wickizer (2):
> Use get_online_cpus to avoid races involving CPU hotplug
> Use get_online_cpus to avoid races involving CPU hotplug
>
> Documentation/RCU/checklist.txt | 6 +
> Documentation/RCU/stallwarn.txt | 16 +-
> Documentation/RCU/trace.txt | 43 +--
> Documentation/RCU/whatisRCU.txt | 9 +-
> Documentation/kernel-parameters.txt | 11 +
> arch/alpha/kernel/process.c | 6 +-
> arch/alpha/kernel/smp.c | 1 +
> arch/cris/kernel/process.c | 3 +
> arch/frv/kernel/process.c | 3 +
> arch/h8300/kernel/process.c | 3 +
> arch/ia64/kernel/process.c | 3 +
> arch/m32r/kernel/process.c | 3 +
> arch/m68k/kernel/process.c | 3 +
> arch/mn10300/kernel/process.c | 3 +
> arch/parisc/kernel/process.c | 3 +
> arch/score/kernel/process.c | 4 +-
> arch/x86/kernel/cpuid.c | 5 +
> arch/x86/kernel/msr.c | 5 +
> arch/xtensa/kernel/process.c | 3 +
> include/linux/interrupt.h | 2 +
> include/linux/rcupdate.h | 6 +-
> kernel/rcupdate.c | 4 +
> kernel/rcutiny.c | 33 +-
> kernel/rcutiny_plugin.h | 10 +-
> kernel/rcutorture.c | 159 +++++----
> kernel/rcutree.c | 690
> ++++++++++++++++++-----------------
> kernel/rcutree.h | 31 +-
> kernel/rcutree_plugin.h | 174 +++++++--
> kernel/rcutree_trace.c | 19 +-
> kernel/sched/core.c | 41 +-
> kernel/time/tick-sched.c | 3 +-
> lib/Kconfig.debug | 14 +
> mm/kmemleak.c | 6 +-
> 33 files changed, 771 insertions(+), 554 deletions(-)
Pulled, thanks a lot Paul!
Ingo
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