linux-kernel - RE: [Xen-devel] Re: GSoC 2010 - Migration from memory ballooning tomemory hotplug in Xen

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Message-ID: <AEC6C66638C05B468B556EA548C1A77D01A0A57D@trantor>
Date:	Fri, 9 Jul 2010 08:58:01 +1000
From:	"James Harper" <james.harper@...digoit.com.au>
To:	"Andi Kleen" <andi@...stfloor.org>,
	"Daniel Kiper" <dkiper@...-space.pl>
Cc:	<jeremy@...p.org>, <xen-devel@...ts.xensource.com>,
	<linux-kernel@...r.kernel.org>
Subject: RE: [Xen-devel] Re: GSoC 2010 - Migration from memory ballooning tomemory hotplug in Xen

> 
> Daniel Kiper <dkiper@...-space.pl> writes:
> >
> > OK, let's go to details. When I was playing with Xen I saw that
> > ballooning does not give possibility to extend memory over boundary
> > declared at the start of system. Yes, I know that is by desing
however
> > I thought that it is a limitation which could by very annoing in
some
> > enviroments (I think especially about servers). That is why I
decided to
> > develop some code which remove that one. At the beggining I thought
> > that it should be replaced by memory hotplyg however after some test
> > and discussion with Jeremy we decided to link balooning (for memory
> > removal) with memory hotplug (for extending memory above boundary
> > declared at the startup of system). Additionaly, we decided to
implement
> > this solution for Linux Xen gustes in all forms (PV/i386,x86_64 and
> > HVM/i386,x86_64).
> 
> While you can do that the value is not very large because you
> could just start the guests with more memory, but ballooned in
> the first place (so that they don't actually use it)
> 

I think hotplug is a better method for adding memory for Windows.

James
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