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

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Date:	Thu, 17 Mar 2011 09:18:19 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	kosaki.motohiro@...fujitsu.com, mel@....ul.ie,
	akpm@...ux-foundation.org, -c@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: rcu_sched_state detected stall on CPU issue

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


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?




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