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Re: [Qemu-devel] Question about dirty page statistics for live migration
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] Question about dirty page statistics for live migration |
Date: |
Mon, 13 Aug 2018 10:35:46 +0100 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
* Li Qiang (address@hidden) wrote:
> Hello Dave, Juan and all,
>
> It is useful to get the dirty page rates in guest to evaluate the guest
> loads
> so that we can make a decide to live migrate it or not. So I think we can
> add a on-demand qmp for showing the dirty page rates.
>
> I found someone has done this work in here:
> -->https://github.com/grivon/yabusame-qemu-dpt
> and here:
> https://github.com/btrplace/qemu-patch
>
> But seems not go to the upstream.
>
> I want to know your opinions about adding this qmp.
Something like that could be good; one easy idea we had was
a 'migrate null:' uri and then you would use most of the existing
migration code to do the measurement; you would only have to
add a dummy file backend, and something to stop the migration ever
terminating (maybe just set the downtime very low).
Dave
> Thanks,
> Li Qiang
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK