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RE: [Xen-devel] Monitoring domU real memory usage

This information is not available from domain0 by default but can be sent from each domU via xenstore.  Look at the shell scripts in xenballoond for an example of how to do that.  Basically, you need a shell script running in each domU to put the information (e.g. /proc/meminfo) into xenstore and a shell script in dom0 to read it and print it.
-----Original Message-----
From: bhavani krishnan [mailto:bhavi63@xxxxxxxxx]
Sent: Friday, October 16, 2009 8:46 AM
To: Pasi Kärkkäinen; Dan Magenheimer
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-devel] Monitoring domU real memory usage

Precisely I want to know how much of the memory is free and active, like we get the mem usage % for apps from top in linux. Thanks, Bhavani

--- On Fri, 10/16/09, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> wrote:

> From: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
> Subject: RE: [Xen-devel] Monitoring domU real memory usage
> To: ""Pasi Kärkkäinen"" <pasik@xxxxxx>, "bhavani krishnan" <bhavi63@xxxxxxxxx>
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Date: Friday, October 16, 2009, 2:53 PM
> > On Thu, Oct 15, 2009 at
> 08:00:07PM -0700, bhavani krishnan wrote:
> > > Hi,
> > >
> > > xentop is only giving me the memory allocated to
> the a domU
> > (Static info). It does not change this info at all. Is
> there
> > anyway to get how much of the allocated memory is the
> domU
> > using? I saw few other similar posts in the archives
> but no
> > solution to it. Please help me out here.
> You'll have to define more precisely what "using" means
> since an OS "uses" (nearly) all the memory given to it for
> one
> thing or another.  Are you referring to ballooning?
> > I don't know if that information is tracked.
> >
> > Xen doesn't do memory overcommit, so it dedicates
> physical memory for
> > each guest, so it's up to the guests what they do with
> it.
> >
> > -- Pasi
> Xen CAN do memory overcommit, just not transparently
> (yet).
> In the xen tree, see tools/xenballoond.  See this
> link
> from Xen Summit 2008 for more description:
> http://wiki.xensource.com/xenwiki/Open_Topics_For_Discussion?action="">>

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