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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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