linux-kernel - Re: Question about usage of RCU in the input layer

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Date:	Sun, 22 Mar 2009 12:46:32 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Eric Dumazet <dada1@...mosbay.com>, dipankar@...ibm.com,
	linux-input@...r.kernel.org, dmitry.torokhov@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: Question about usage of RCU in the input layer

On Sun, 22 Mar 2009 09:53:24 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> 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

-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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