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

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Message-ID: <20100709173256.GC8696@router-fw-old.local.net-space.pl>
Date:	Fri, 9 Jul 2010 19:32:56 +0200
From:	Daniel Kiper <dkiper@...-space.pl>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Daniel Kiper <dkiper@...-space.pl>,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] Re: GSoC 2010 - Migration from memory ballooning to	memory hotplug in Xen

On Fri, Jul 09, 2010 at 02:34:09AM +0200, Andi Kleen wrote:
> > > The only advantage of using memory hotadd is that the mem_map doesn't
> > > need to be pre-allocated, but that's only a few percent of the memory.
> > >
> > > So it would only help if you want to add gigantic amounts of memory
> > > to a VM (like >20-30x of what it already has).
> >
> > That's not wildly unreasonable on the face of it; consider a domain
> > which starts at 1GB but could go up to 32GB as demand requires.  But
>
> The programs which need 32GB will probably not even start in 1GB :)

I am able to run program which allocates 32GB on machine 1GB... :-)))
Do not underestimate memory overcommit...

Daniel
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