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Date: Tue, 6 Sep 2011 11:00:15 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org Cc: mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com, patches@...aro.org Subject: [PATCH tip/core/rcu 0/55] Preview of RCU changes for 3.2 Hello! This patchset adds RCU event tracing, improved diagnostics and documentation, and fixes a number of bugs, including several from an ongoing top-to-bottom inspection of RCU. The patches are as follows: 1. Place per-CPU kthreads' stack and task struct on the corresponding node on NUMA systems (courtesy of Eric Dumazet). 2. Avoid unnecessary self-wakeups for per-CPU kthreads (courtesy of Shaohua Li). 3,6,10,12,25,28,33. Documentations updates (some courtesy Wanlong Gao). 4. Add replacement checks for blocking within an RCU read-side critical section. 5. Header-file untangling part 1 of N: move rcu_head to types.h. 7. Fix mismatched variable declaration (courtesy of Andi Kleen). 8. Abstract out common grace-period-primitive code. 9. Update rcutorture to test newish RCU API members. 11. Drive RCU algorithm selection directly from SMP and PREEMPT. 13. Make rcu_torture_boost() wait for callbacks before telling debug-objects that they are done. 14-17,20,22. Add event tracing for RCU. 18. Update comments to reflect kthreads being used only when RCU priority boosting is enabled. 19. Move RCU_BOOSt data declarations to alow compiler to detect mismatches. 20. Make TINY_RCU use softirqs for RCU_BOOST=n. 23. Simplify quiescent-state accounting. 24. Stop passing rcu_read_lock_held() to rcu_dereference_protected() (courtesy of Michal Hocko). 26. Remove unused and redundant RCU API members. 27. Allow rcutorture's stat_interval parameter to be changed at runtime to make it easier to test RCU in guest OSes. 28. Removed unused nohz_cpu_mask (courtesy of Alex Shi). 30. Eliminate in_irq() checks in rcu_enter_nohz(). 31. Fix rcu_implicit_dynticks_qs() local-variable size mismatches. 32. Make rcu_assign_pointer() unconditionally emit memory barrier to silence new gcc warnings (courtesy of Eric Dumazet). 34. Move __rcu_read_lock()'s barrier within if-statement. 35. Dump local stack for CPU stall warnings if cannot dump all stacks. 36. Prevent early-boot set_need_resched() from __rcu_pending(). 37. Simplify unboosting checks. 38. Prohibit RCU grace periods during early boot. 39. Suppress NMI backtraces when CPU stall ends before dump. 40. Avoid just-online CPU needlessly rescheding itself. 41. Permit rt_mutex_unlock() with irqs disabled. 42-43. Prevent end-of-test rcutorture hangs. 44. Wire up RCU_BOOST_PRIO, use conventional kthread naming scheme (courtesy of Mike Galbraith). 45. Check for entering dyntick-idle in RCU read-side critical section. 46. Adjust RCU_FAST_NO_HZ to avoid false quiescent states. 47. Avoid concurrent end of old GP with start of new GP. 48. Strengthen powerpc value-returning atomic memory ordering. 49-51. Detect illegal RCU use from dyntick-idle mode (courtesy of Frederic Weisbecker). 52. Remove an unnecessary layer of abstraction from PROVE_RCU checking. 53. Detect illegal SRCU use from dyntick-idle mode. 54. Make SRCU use common lockdep-splat code. 55. Placeholder patch that disables illegal tracing from dyntick-idle mode (illegal because tracing uses RCU). For a testing-only version of this patchset from git, please see the following subject-to-rebase (and subject-to-Hera-availability) branch: git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git rcu/testing Thanx, Paul ------------------------------------------------------------------------ Documentation/RCU/NMI-RCU.txt | 4 Documentation/RCU/lockdep.txt | 24 + Documentation/RCU/torture.txt | 3 Documentation/RCU/trace.txt | 34 +- b/Documentation/RCU/NMI-RCU.txt | 2 b/Documentation/RCU/lockdep-splat.txt | 110 +++++++ b/Documentation/RCU/lockdep.txt | 10 b/Documentation/RCU/torture.txt | 134 +++++++-- b/Documentation/RCU/trace.txt | 4 b/arch/powerpc/include/asm/synch.h | 6 b/arch/powerpc/platforms/pseries/lpar.c | 6 b/include/linux/lockdep.h | 2 b/include/linux/rcupdate.h | 28 + b/include/linux/rcutiny.h | 16 + b/include/linux/rcutree.h | 2 b/include/linux/sched.h | 1 b/include/linux/srcu.h | 25 + b/include/linux/types.h | 10 b/include/trace/events/rcu.h | 98 ++++++ b/init/Kconfig | 6 b/kernel/lockdep.c | 84 +++-- b/kernel/pid.c | 4 b/kernel/rcu.h | 79 +++++ b/kernel/rcupdate.c | 21 + b/kernel/rcutiny.c | 28 - b/kernel/rcutiny_plugin.h | 14 b/kernel/rcutorture.c | 5 b/kernel/rcutree.c | 22 - b/kernel/rcutree.h | 7 b/kernel/rcutree_plugin.h | 5 b/kernel/rcutree_trace.c | 2 b/kernel/rtmutex.c | 8 b/kernel/sched.c | 2 b/kernel/time/tick-sched.c | 6 include/linux/rcupdate.h | 420 ++++++++++++++--------------- include/linux/rcutiny.h | 4 include/linux/sched.h | 3 include/linux/srcu.h | 5 include/trace/events/rcu.h | 449 ++++++++++++++++++++++++++++---- kernel/lockdep.c | 20 + kernel/rcu.h | 16 - kernel/rcupdate.c | 22 + kernel/rcutiny.c | 139 +++------ kernel/rcutiny_plugin.h | 120 ++++++-- kernel/rcutorture.c | 72 ++--- kernel/rcutree.c | 313 +++++++++++++++------- kernel/rcutree.h | 10 kernel/rcutree_plugin.h | 150 +++++----- kernel/rcutree_trace.c | 13 kernel/sched.c | 11 50 files changed, 1761 insertions(+), 818 deletions(-) -- 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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