On Sun, Mar 22, 2009 at 12:46:32PM -0700, Arjan van de Ven wrote:

On Sun, 22 Mar 2009 09:53:24 -0700
"Paul E. McKenney" [off-list ref] wrote:

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How many synchronize_rcu() calls are you seeing on the boot path?

I see 20 that hit the above code path (eg ones that wait) until
userspace starts.

So with well-behaved readers, the full sequence would be worth
something like 50-60 milliseconds.

yeah it's about 10% if the total kernel boot time.. so it does start to
matter

Half-second boot, eh?  That would indeed be impressive.

							Thanx, Paul