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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.
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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