[Xen-API] [RFC] host memory ballooning daemon

[Dave Scott <Dave.Scott@xxxxxxxxxxxxx>]

Hi,

'squeezed' is a prototype memory ballooning daemon which:
* applies a 'ballooning policy' to all domains running on a host; and
* exports a simple host memory management interface allowing a toolstack to 
'reserve' memory for new domains.

I've written up some notes on how it's supposed to work and what assumptions is 
based on. The .pdf is attached to this wiki page:
 http://wiki.xensource.com/xenwiki/squeezed

The 'squeezed' code lives over in the xapi repo:
 http://xenbits.xen.org/xapi/xen-api.hg
in ocaml/xenops/squeeze*

The current 'ballooning policy' is really a simple proof-of-concept. In the 
future we'd like to experiment with other policies (perhaps based on metrics 
provided by something like xenballoond)

Comments / criticism much appreciated!

Thanks,
Dave

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