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Message-ID: <20120204014452.GA29811@linux.vnet.ibm.com> Date: Fri, 3 Feb 2012 17:44:52 -0800 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, fweisbec@...il.com, patches@...aro.org Subject: [PATCH tip/core/rcu 0/N] v2 RCU commits for 3.4 Hello! This is v2 of this patchset. Earlier versions may be found at https://lkml.org/lkml/2012/2/1/354 and https://lkml.org/lkml/2012/2/2/575. A big "thank you" to all the reviewers, particularly Josh Triplett, for the excellent feedback. This patchset makes RCU more aggressive about entering dyntick-idle mode in order to improve energy efficiency, converts a few more call_rcu()s to kfree_rcu(), applies a number of rcutree fixes and cleanups to rcutiny, removes CONFIG_SMP #ifdef from treercu, allows RCU CPU stall times to be set via sysfs, add CPU-stall capability to rcutorture, adds more RCU-abuse diagnostics, updates documentation, and yet more fixes from the still-ongoing top-to-bottom inspection of RCU with a special focus on the CPU-hotplug code path. The patches are as follows: 1,26,31,33,41,40. Documentation upgrades. 2. Improve synchronize_rcu() diagnostics, courtesy of Frederic Weisbecker. 3. Add lockdep-RCU checks for simple self deadlock, such as calling synchronize_rcu() while in an RCU read-side critical section. 4. Add a diagnostic for misaligned rcu_head structures. This is preparation for a call_rcu_lazy() for added energy efficiency. 5,14,37. Upgrades to CONFIG_RCU_FAST_NO_HZ. 6. Move CONFIG_RCU_TRACE to lib/Kconfig.debug: not for production use. 7-11. Convert several call_rcu() primitives to kfree_rcu(). 12,13,15,16,35,38,39. Fixes to and streamlining of CPU-hotplug handling based on review. 17. Remove dubious single-rcu_node optimization from rcu_start_gp(). 18-22. Apply prior rcutree fixes to rcutiny. 23. Catch rcu_preempt_needs_cpu()'s name up with 2011. 24. Check for idle-loop entry while in an RCU read-side critical section. 25. Check for sleeping in TREE_RCU read-side critical sections. 27,36. Remove "#ifdef CONFIG_SMP" from treercu, move code accordingly. 28. Allow RCU CPU stall times to be adjusted at runtime via sysfs. 29. Print scheduling-clock timer information on RCU CPU stall warning messages if requested by CONFIG_RCU_CPU_STALL_INFO config parameter. 30. Allow rcutorture to be told to hold off CPU-hotplug operations during early boot. 32. Allow rcutorture to generate CPU stalls in order to test RCU CPU stall warning facility. 34. Silence module-parameter warnings by converting a couple of rcutorture's module parameters to bool. 41. Fix misplaced NULL-pointer check in rcutorture. 42. Convert WARN_ON_ONCE() in rcu_lock_acquire() to lockdep, in part courtesy of Heiko Carstens. 43. Fix botched PTR_ERR() call, courtesy of Julia Lawall. 44. Remove now-redundant check for rcu_head misalignment. 45-47. Fix incorrect uses of RCU from the idle loop. Note that patch 47 will likely be replaced by some event-tracing upgrades from Steven Rostedt. For a testing-only version of this patchset from git, please see the following subject-to-rebase branch: git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next Thanx, Paul ------------------------------------------------------------------------ Documentation/RCU/torture.txt | 20 b/Documentation/RCU/RTFP.txt | 1902 +++++++++++++++++++++++++++++++++---- b/Documentation/RCU/checklist.txt | 14 b/Documentation/RCU/stallwarn.txt | 87 + b/Documentation/RCU/torture.txt | 13 b/Documentation/RCU/trace.txt | 36 b/arch/s390/kernel/irq.c | 9 b/drivers/cpuidle/cpuidle.c | 12 b/drivers/target/tcm_fc/tfc_sess.c | 12 b/include/linux/rcupdate.h | 2 b/include/linux/rcutiny.h | 6 b/include/linux/rcutree.h | 1 b/include/linux/sched.h | 3 b/include/linux/srcu.h | 11 b/include/trace/events/rcu.h | 63 - b/init/Kconfig | 9 b/kernel/lockdep.c | 8 b/kernel/rcu.h | 4 b/kernel/rcupdate.c | 5 b/kernel/rcutiny.c | 4 b/kernel/rcutiny_plugin.h | 5 b/kernel/rcutorture.c | 4 b/kernel/rcutree.c | 8 b/kernel/rcutree.h | 3 b/kernel/rcutree_plugin.h | 4 b/kernel/rcutree_trace.c | 8 b/kernel/srcu.c | 6 b/lib/Kconfig.debug | 10 b/net/ipv4/cipso_ipv4.c | 11 b/net/ipv4/ip_sockglue.c | 7 b/net/mac80211/mesh_pathtbl.c | 8 include/linux/rcupdate.h | 81 + include/linux/rcutiny.h | 4 include/linux/rcutree.h | 18 include/linux/srcu.h | 4 kernel/rcu.h | 22 kernel/rcutiny.c | 22 kernel/rcutiny_plugin.h | 72 + kernel/rcutorture.c | 91 + kernel/rcutree.c | 661 ++++++++---- kernel/rcutree.h | 24 kernel/rcutree_plugin.h | 443 +++++--- kernel/rcutree_trace.c | 6 kernel/srcu.c | 27 lib/Kconfig.debug | 14 45 files changed, 3055 insertions(+), 729 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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