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Re: [Qemu-devel] Question about dirty page statistics for live migration
From: |
Li Qiang |
Subject: |
Re: [Qemu-devel] Question about dirty page statistics for live migration |
Date: |
Mon, 13 Aug 2018 18:31:51 +0800 |
2018-08-13 17:35 GMT+08:00 Dr. David Alan Gilbert <address@hidden>:
> * 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,
As far as I understand, here dummy file backend just means the file migrate
to, right?
Thanks,
Li Qiang
> 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
>