linux-kernel - Re: [PATCH 00/13] KVM: MMU: fast page fault

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Message-Id: <20120411211514.35db29c11460516e604059b6@gmail.com>
Date:	Wed, 11 Apr 2012 21:15:14 +0900
From:	Takuya Yoshikawa <takuya.yoshikawa@...il.com>
To:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
Cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	Xiao Guangrong <xiaoguangrong.eric@...il.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 00/13] KVM: MMU: fast page fault

On Tue, 10 Apr 2012 19:58:44 +0800
Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com> wrote:

> No, i do not really agree with that.
> 
> We really can get great benefit from O(1) especially if lockless write-protect
> is introduced for O(1), live migration is very useful for cloud computing
> architecture to balance the overload on all nodes.

Recently, you said to me that you were not familiar with live migration.
Actually you did not know the basics of pre-copy live migration.

I know live migration better than you because NTT has Kemari and it uses
live migration infrastructure.  My work is originated from the data
I got during profiling Kemari.

SRCU-less dirty logging was also motivated by the pressures from scheduler
developers.  Everything was really needed.

Have you ever used live migration for real service?

I cannot say whether O(1) is OK with me without any real background.

	Takuya
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