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    SubjectRe: [PATCH, RFC, tip/core/rcu] v3 scalable classic RCU implementation
    On Sat, Aug 30, 2008 at 11:33:00AM +0200, Peter Zijlstra wrote:
    > On Fri, 2008-08-29 at 17:49 -0700, Paul E. McKenney wrote:
    > > Some shortcomings:
    > >
    > > o Entering and leaving dynticks idle mode is a quiescent state,
    > > but the current patch doesn't take advantage of this (noted
    > > by Manfred). It appears that it should be possible to make
    > > nmi_enter() and nmi_exit() provide an in_nmi(), which would make
    > > it possible for rcu_irq_enter() and rcu_irq_exit() to figure
    > > out whether it is safe to tell RCU about the quiescent state --
    > > and also greatly simplify the code.
    > Already done and available in the -tip tree, curtesy of Mathieu.

    Very cool!!! I see one of his patches at,
    but how do I find out which branch of -tip this is on? (I am learning
    git, but it is a slow process...)

    This would also simplify preemptable RCU's dyntick interface, removing
    the need for proofs.

    Thanx, Paul

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