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

[Dan Magenheimer <dan.magenheimer@oracle.com>]

> From: Ian Campbell [mailto:Ian.Campbell@citrix.com]
> Sent: Sunday, May 06, 2012 3:36 AM
> To: Olaf Hering
> Cc: xen-devel@lists.xensource.com; Konrad Rzeszutek Wilk
> Subject: Re: [Xen-devel] [PATCH] xl.cfg: document the maxmem= option
> 
> 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@aepfle.de>
> > > > # Date 1336159720 -7200
> > > > # Node ID c414728d0d12f1c3e416e40cceefca2f0b00578e
> > > > # Parent  8f556a70ae0bef47e242f9e7be0a054769fc8277
> > > > xl.cfg: document the maxmem= option
> > > >
> > > > Signed-off-by: Olaf Hering <olaf@aepfle.de>
> > > >
> > > > 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.

can _ever_ see...

What about guest OS's that support hotplug memory?

Also, a subtle point, but is this the maximum physical address that
will contain read/write pages or the maximum amount of RAM that the
guest OS should be prepared to map as read/writeable (e.g. after
subtracting off reserved e820 ranges) or ???