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

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Message-ID: <20090320215825.19b8baae@infradead.org>
Date:	Fri, 20 Mar 2009 21:58:25 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	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 Fri, 20 Mar 2009 18:27:46 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> > I've seen only this (input) one to take a long time
> 
> Ouch!!!  A -single- synchronize_rcu() taking a full second???  That
> indicates breakage.

I'll do a debug mode tomorrow and visualize it as part of the bootgraph;
hopefully it'll be an interesting result.
I'll share the graph when I have it....



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
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