Re: Question about usage of RCU in the input layer

[Paul E. McKenney]

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" <paulmck@xxxxxxxxxxxxxxxxxx> wrote:
> 
> > > > 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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/