Re: [PATCH, RFC, tip/core/rcu] v3 scalable classic RCUimplementation

[Paul E. McKenney]

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 http://lkml.org/lkml/2008/4/17/342,
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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