Re: [Xen-devel] Memory overcommit

[Jacob Gorm Hansen <jacobg@xxxxxxx>]

On 12/13/05, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
>
> On 11 Dec 2005, at 19:59, Rik van Riel wrote:
>
> >> Even better, if each domain is only used occasionally, then you could
> >> save them to disc and restore them on demand.
> >
> > How would one implement such a "wake on LAN" functionality
> > for Xen domains ?
>
> There are various ways. Maybe require explicit signalling from the user
> via some command to the control-plane tools (start up my domain / shut
> down my domain). You could also do it implicitly (although it may
> require some iptables hacking) by tracking network connections to the
> domain's IP address -- start it up on first connection / shut it down
> when last connection finishes.

Or you could use my self-checkpointing code to have the domain save
itself, then free most of its pages, except for a small stub that
would listen for some 'wake up' event on the network interface (e.g. a
TCP SYN packet). The stub could then allocate new pages and resume the
checkpoint from disk.

Jacob

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