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    Subject[PATCH 0/4 RFC] preemptible RCU
    Hello!

    This patchset is an update of that posted by Dipankar last January
    (http://lkml.org/lkml/2007/1/15/133). This is work in progress, not yet
    ready for inclusion. It passes rcutorture on i386, x86_64, and ppc64
    boxes as well as kernbench, so should be safe for experimentation. As
    with Dipankar's previous post, this variant of preemptible rcu_read_lock()
    and rcu_read_unlock may be invoked from NMI/SMI handlers, and do not
    contain any heavyweight atomic operations or memory barriers (although
    they do still momentarily disable IRQs). This patchset features
    a fully parallel grace-period computation, which will become increasingly
    important with upcoming multicore/multi-threaded CPUs. In addition,
    this patchset provides a preemptible-RCU variant of synchronize_sched()
    that avoids the previous deadlock with CPU hotplug -- this variant may
    eventually prove unnecessary, but is offered in the spirit of separating
    concerns.

    Next steps: (1) Integrate with CPU hotplug. (2) Re-merge RCU priority
    boosting. (3) Fix some naming issues. Longer term work includes
    optimized dyntick operation and eliminating the interrupt disabling
    in rcu_read_lock() and rcu_read_unlock().

    Thanx, Paul
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