linux-kernel - Re: rcu self-detected stall messages on OMAP3, 4 boards

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Date:	Thu, 20 Sep 2012 07:56:03 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	linux-kernel@...r.kernel.org, bbruce@...com,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	khilman@...com, santosh.shilimkar@...com, jon-hunter@...com,
	snijsure@...d-net.com
Subject: Re: rcu self-detected stall messages on OMAP3, 4 boards

Hi,

On Wed, 19 Sep 2012, Paul E. McKenney wrote:

> On Thu, Sep 13, 2012 at 06:52:10PM +0000, Paul Walmsley wrote:
> 
> > On Wed, 12 Sep 2012, Paul E. McKenney wrote:
>  
> > > Subodh Nijsure (also CCed) reported something that might be similar on
> > > ARM, and also reported that setting the following got rid of the stalls:
> > > 
> > > 	CONFIG_CPU_IDLE=y
> > > 	CONFIG_CPU_IDLE_GOV_LADDER=y
> > > 	CONFIG_CPU_IDLE_GOV_MENU=y
> > > 
> > > At which point he was happy, which was good, but which also left the
> > > underlying problem unsolved.  Do these affect your system?  If so,
> > > do they cause a different ARM idle loop to be executed?
> > 
> > Will give this a try.  What board was Subodh using?
> 
> Any news on trying the above settings?

Sorry, haven't had the chance to try it yet due to the impending merge 
window opening.  Once things settle down I'll give it a try -- or maybe 
someone else can test it in the meantime.


- Paul
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