Re: [RFC,PATCH] Use RCU to protect tasklist for unicast signals

[Paul E. McKenney]

On Fri, Aug 12, 2005 at 08:36:00AM +0200, Ingo Molnar wrote:
> 
> * Lee Revell <rlrevell@xxxxxxxxxxx> wrote:
> 
> > Doesn't this fix the longest latency we were seeing with 
> > PREEMPT_DESKTOP, I don't have a trace handy but the upshot was "signal 
> > delivery must remain atomic on !PREEMPT_RT"?
> 
> yes - although Paul's patch converts only a portion of the signal code 
> to RCU-read-lock, so i'd expect there to be other latencies too. Might 
> be worth a test (once we've sorted out the HRT build bugs).

And there remains the question of how much of the benefit remains after
I handle the corner cases...  :-/

						Thanx, Paul
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