From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: [PATCH v2 6/8] kvm tools: Add rwlock wrapper
Date: Tue, 14 Jun 2011 21:22:57 -0700
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Cc: Ingo Molnar <mingo@elte.hu>, Yinghai Lu <yinghai@kernel.org>,
	Avi Kivity <avi@redhat.com>,
	Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>,
	Pekka Enberg <penberg@kernel.org>, kvm@vger.kernel.org,
	asias.hejun@gmail.com, gorcunov@gmail.com,
	prasadjoshi124@gmail.com, takuya.yoshikawa@gmail.com
To: Sasha Levin <levinsasha928@gmail.com>
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On Tue, Jun 14, 2011 at 09:25:22PM -0400, Sasha Levin wrote:
> On Tue, 2011-06-14 at 16:42 -0700, Paul E. McKenney wrote:
> > On Tue, Jun 14, 2011 at 06:26:01PM -0400, Sasha Levin wrote:
> > > Sorry for the delay on this.
> > 
> > Actually, you might have had excellent timing on this one.
> > 
> > Could you please try Shaohua Li's patch at:
> > 
> > 	https://lkml.org/lkml/2011/6/14/20
> > 
> > This patch makes RCU much less prone to causing massive scheduler lock
> > contention, which might well be the cause of the problems that you
> > are seeing.
> 
> This patch has solved the hang issue I've had. kvm tools now boots 60
> vcpus easily with 3.0 kernel.

Thank you, Sasha -- I have added your Tested-by.

							Thanx, Paul