Re: [RFC PATCH] kick sleeping idle CPUS on cpu_idle_wait

[Andi Kleen]

On Mon, Jan 07, 2008 at 09:27:24PM -0500, Steven Rostedt wrote:
> 
> Sometimes cpu_idle_wait gets stuck because it might miss CPUS that are
> already in idle, have no tasks waiting to run and have no interrupts
> going to them.  This is common on bootup when switching cpu idle
> governors.

I must admit I never liked that cpu idle wait code anyways. Why again
can't normal RCU be used for this? Waiting for two RCU quiescent cycles should
be enough, shouldn't it?

-Andi
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