Re: [Xen-devel] [PATCH] xl.cfg: document the maxmem= option

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2012-05-04 at 16:18 -0400, Olaf Hering wrote:
> On Fri, May 04, Konrad Rzeszutek Wilk wrote:
> 
> > On Fri, May 04, 2012 at 09:31:42PM +0200, Olaf Hering wrote:
> > > # HG changeset patch
> > > # User Olaf Hering <olaf@xxxxxxxxx>
> > > # Date 1336159720 -7200
> > > # Node ID c414728d0d12f1c3e416e40cceefca2f0b00578e
> > > # Parent  8f556a70ae0bef47e242f9e7be0a054769fc8277
> > > xl.cfg: document the maxmem= option
> > > 
> > > Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
> > > 
> > > diff -r 8f556a70ae0b -r c414728d0d12 docs/man/xl.cfg.pod.5
> > > --- a/docs/man/xl.cfg.pod.5
> > > +++ b/docs/man/xl.cfg.pod.5
> > > @@ -484,6 +484,14 @@ are not using hardware assisted paging (
> > >  mode) and your guest workload consists of a a very large number of
> > >  similar processes then increasing this value may improve performance.
> > >  
> > > +=item B<maxmem=MBYTES>
> > > +
> > > +Specifies the maximum amount of memory the HVM guest can ever see.
> > 
> > Isn't it also for PV guests (though without the PoD functionality)?
> 
> Now that I look again at libxl__build_pre(), it appearently does also
> something for PV guests.

Right. Some people call this booting "pre-ballooned". Essentially n PV
the balloon driver can be initialised early enough that something like
PoD is not required -- the missing pages are just incorporated directly
into the balloon.

(strictly speaking the balloon driver isn't actually initialised early,
but rather the pages are reserved/set-aside for it very early on).

Ian.



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