Messages in this thread | | | Date | Tue, 22 Mar 2005 02:34:49 -0800 | Subject | Re: Real-Time Preemption and RCU | From | Bill Huey (hui) <> |
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On Tue, Mar 22, 2005 at 02:17:27AM -0800, Bill Huey wrote: > > A notion of priority across a quiescience operation is crazy anyways[-,-] so > > it would be safe just to use to the old rwlock-semaphore "in place" without > > any changes or priorty handling add[i]tions. The RCU algorithm is only concerned > > with what is basically a coarse data guard and it isn't time or priority > > critical. > > A little jitter in a quiescence operation isn't going to hurt things right ?.
The only thing that I can think of that can go wrong here is what kind of effect it would have on the thread write blocking against a bunch of RCU readers. It could introduce a chain of delays into, say, a timer event and might cause problems/side-effects for other things being processed. RCU processing might have to decoupled processed by a different thread to avoid some of that latency weirdness.
What do you folks think ?
bill
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