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    Subject[PATCH tip/core/rcu 0/23] Improvements to RT response on big systems and expedited functions

    This patch series contains additional improvements to latency for
    large systems (beyond those in 3.6), along with improvements to
    synchronize_rcu_expedited(). It also fixes one race introduced by the
    latency improvements and another that was there to start with (but made
    more probable by the latency improvements). These are in a single
    series due to conflicts that would otherwise occur. The individual
    patches are as follows:

    1-6. Move RCU grace-period initialization and cleanup into a kthread:
    1. Move RCU grace-period initialization into kthread.
    2. Allow RCU grace-period initialization to be preempted.
    3. Move RCU grace-period cleanup into kthread.
    4. Allow RCU grace-period cleanup to be preempted.
    5. Prevent offline CPUs from executing RCU core code.
    6. Break up rcu_gp_kthread() into subfunctions.
    7. Provide an OOM handler to allow lazy callbacks to be motivated
    under memory pressure.
    8. Segregate rcu_state fields to improve cache locality
    (Courtesy of Dimitri Sivanich).
    9-12. Move RCU grace-period forcing into a kthread.
    9. Move quiescent-state forcing into kthread.
    10. Allow RCU quiescent-state forcing to be preempted.
    11. Adjust debugfs tracing for kthread-based quiescent-state
    12. Prevent force_quiescent_state() memory contention.
    13. Control grace-period duration from sysfs.
    14. Remove now-unused rcu_state fields.
    15. Make rcutree module parameters visible in sysfs.
    16. Prevent initialization-time quiescent-state race.
    17. Fix day-zero grace-period initialization/cleanup race.
    18. Add random PROVE_RCU_DELAY to provoke initalization races.
    19. Adjust for unconditional ->completed assignment.
    20. Remove callback acceleration from grace-period initialization
    due it no longer being safe.
    21. Eliminate signed overflow in synchronize_rcu_expedited().
    22. Reduce synchronize_rcu_expedited() latency.
    23. Simplify quiescent-state detection.

    Thanx, Paul


    b/Documentation/RCU/trace.txt | 43 -
    b/Documentation/kernel-parameters.txt | 11
    b/kernel/rcutree.c | 191 +++++---
    b/kernel/rcutree.h | 3
    b/kernel/rcutree_plugin.h | 80 +++
    b/kernel/rcutree_trace.c | 3
    kernel/rcutree.c | 805 +++++++++++++++++-----------------
    kernel/rcutree.h | 25 -
    kernel/rcutree_plugin.h | 48 +-
    kernel/rcutree_trace.c | 12
    10 files changed, 690 insertions(+), 531 deletions(-)

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