Re: [patch] Real-Time Preemption, -RT-2.6.12-rc1-V0.7.41-07

[Ingo Molnar]

* Paul E. McKenney <paulmck@xxxxxxxxxx> wrote:

> Now, it is true that CPU#2 might record a quiescent state during this 
> time, but this will have no effect because -all- CPUs must pass 
> through a quiescent state before any callbacks will be invoked.  Since 
> CPU#1 is refusing to record a quiescent state, grace periods will be 
> blocked for the full extent of task 1's RCU read-side critical 
> section.

ok, great. So besides the barriers issue (and the long grace period time 
issue), the current design is quite ok. And i think your original flip 
pointers suggestion can be used to force synchronization.

	Ingo
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