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Message-ID: <20120926111442.GA21143@gmail.com> Date: Wed, 26 Sep 2012 13:14:42 +0200 From: Ingo Molnar <mingo@...nel.org> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: mingo@...e.hu, linux-kernel@...r.kernel.org, josh@...htriplett.org, sivanich@....com, wangyun@...ux.vnet.ibm.com, zhong@...ux.vnet.ibm.com, peterz@...radead.org, sbw@....edu, fweisbec@...il.com Subject: Re: [RFC GIT PULL rcu/next] v2 RCU commits for 3.7 * Paul E. McKenney <paulmck@...ux.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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