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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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