Re: [Xen-devel] Error restoring DomU when using GPLPV

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

just in case someone missed the thread earlier,

3 = 1 shinfo + 2 gnt frames default.

so, tot_pages + shinfo + num gnt frames.


Mukesh



Dan Magenheimer wrote:
> Before we close down this thread, I have a concern:
>
> According to Mukesh, the fix to this bug is dependent
> on the pv drivers tracking tot_pages for a domain
> and ballooning to ensure tot_pages+3 does not exceed
> max_pages for the domain.
>
> Well, tmem can affect tot_pages for a domain inside
> the hypervisor without any notification to pv drivers
> or the balloon driver.  And I'd imagine that PoD and
> future memory optimization mechanisms such as
> swapping and page-sharing may do the same.
>
> So this solution seems very fragile.
>
> Dan
>
> > -----Original Message-----
> > From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx]
> > Sent: Wednesday, September 16, 2009 6:28 AM
> > To: Annie Li
> > Cc: Joshua West; Dan Magenheimer; xen-devel; Kurt Hackel; 
> > James Harper;
> > Wayne Gong
> > Subject: Re: [Xen-devel] Error restoring DomU when using GPLPV
> >
> >
> > On 16/09/2009 12:10, "ANNIE LI" <annie.li@xxxxxxxxxx> wrote:
> >
> > > > I will do more test to make sure it and update here.
> > > I tried to map 256 grant frames during initialization and 
> > balloon down
> > > 256+1(shinfo+gnttab) pages driver first
> > > load. Then i did save/restore for 50 times, and live 
> > migration for 10
> > > times. No error occurs.
> > Okay, well I still can't explain why that fixes it, but 
> > clearly it does. So
> > that's good. :-)
> >
> >  -- Keir
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel