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

[Lee Revell]

On Thu, 2005-08-11 at 11:56 +0200, Ingo Molnar wrote:
> > For the record, some shortcomings of this patch:
> > 
> > o	Needs lots more testing on more architectures.
> > 
> > o	Needs performance and stress testing.
> > 
> > o	Needs testing in Ingo's PREEMPT_RT environment.
> 
> cool patch! I have integrated it into my PREEMPT_RT tree, and all it 
> needed to boot was the patch below (doesnt affect the upstream kernel).  
> Using the raw IRQ flag isnt an issue in the RCU code, all the affected 
> codepaths are small and deterministic.
> 

Ingo,

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"?

Lee

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