linux-kernel - Re: rcu_sched_state detected stall on CPU issue

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Date:	Wed, 16 Mar 2011 19:25:06 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	mel@....ul.ie, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Preeti.Khurana@...vus.com
Subject: Re: rcu_sched_state detected stall on CPU issue

On Thu, Mar 17, 2011 at 09:18:19AM +0900, KOSAKI Motohiro wrote:
> Hi Paul,
> 
> > Hello!
> > 
> > It looks like Preeti found a way to loop in kswapd with preemption
> > disabled, please see attached dmesg.   This is using 2.6.35-45.fc14.
> > 
> > Any thoughts or recent patches that might help?
> 
> We fixed a kswapd infinite loop issue when memory is fragmented at 2.6.38.
> Could you please try following commits? (all are mm/vmscan.c change)
> 
> commit dc83edd941f412e938841b4989be24aa288a1aa6
> commit 355b09c47a0cbb73b3e65a57c03f157f2e7ddb0b
> commit 4d40502ea580c35414a1466d86f96484910ebaec
> commit 0abdee2bd4118366c62349a304f81537be69af33
> commit 1741c87757448cedd03224f01586504f9256415d
> commit 9950474883e027e6e728cbcff25f7f2bf0c96530

Thank you, Kosaki!

> And, your attached file and your quoted mail don't have /proc/zoneinfo
> information. then I have no way to confirn his environment is heavy
> fragmented or not. If possible, could you please get /proc/zoneinfo
> info?

Preeti, could you please send this info and try out the above patches?

							Thanx, Paul
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