[Xen-devel] Re: [Xen-users] Xen 4 - Page Sharing HowTo?

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Apr 09, 2010 at 01:38:12PM +0100, Andrew Lyon wrote:
> On Fri, Apr 9, 2010 at 1:36 PM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
> > On Fri, Apr 9, 2010 at 1:26 PM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
> >> On Fri, Apr 9, 2010 at 1:18 PM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
> >>> On Thu, Apr 8, 2010 at 11:01 PM, Nick Couchman <Nick.Couchman@xxxxxxxxx> 
> >>> wrote:
> >>>> One of the features listed as having been added to Xen 4 is page sharing 
> >>>> for HVM domUs.  I was wondering if 1) this is automatic, or something 
> >>>> that must be enabled, and 2) if it must be enabled, how do you go about 
> >>>> enabling it?
> >>>>
> >>>> Thanks!
> >>>> -Nick
> >>>
> >>> See 
> >>> http://lists.xensource.com/archives/html/xen-changelog/2009-12/msg00192.html
> >>>
> >>> The setting you need to add is memory_sharing
> >>>
> >>> I think it may require hap but I am not sure yet.. just about to test it.
> >>>
> >>> Andy
> >>>
> >>
> >> I added memory_sharing=1 to two hvm guests and started them up, xm log
> >> shows that the setting was applied but there seems to be no change in
> >> the reported memory usage, is there any way to monitor shared memory
> >> performance?
> >>
> >> Andy
> >>
> >
> > I don't think memory_sharing=1 works at all, the very first thing that
> > should happen when it is enabled is a printk:
> >
> > void mem_sharing_init(void)
> > {
> >    printk("Initing memory sharing.\n");
> >
> >
> > But I've not seen that at all on my 4.x system.
> >
> > Andy
> >
> 
> Also the 4.0 release announcement mentioned page to disk, but again I
> can find no reference to that... has anybody tested these new
> features?
> 

Hopefully someone from xen-devel can help us with this feature..

-- Pasi


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