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

[Takuya Yoshikawa]

(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) 
> write
> 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 
distributed.
But I think it is O(N), and the total number of costs will not change so much,
I guess.

        Takuya

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