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Re: [Qemu-devel] [PATCH 0/4] KVM: Dirty logging optimization using rmap

From: Takuya Yoshikawa
Subject: Re: [Qemu-devel] [PATCH 0/4] KVM: Dirty logging optimization using rmap
Date: Wed, 30 Nov 2011 14:15:47 +0900
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; ja; rv: Gecko/20111103 Thunderbird/3.1.16

(2011/11/30 14:02), Takuya Yoshikawa wrote:

IIUC, even though O(1) is O(1) at the timing of GET DIRTY LOG, it needs O(N) 
protections with respect to the total number of dirty pages: distributed, but
actually each page fault, which should be logged, does some write protection?

Sorry, was not precise.  It depends on the level, and not completely 
But I think it is O(N), and the total number of costs will not change so much,
I guess.


In general, what kind of improvements actually needed for live migration?

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