Re: [Xen-ia64-devel] Regression: [IA64] Saner dom0 memory and cpudefaults

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Tue, Sep 04, 2007 at 09:24:17PM -0600, Alex Williamson wrote:
> On Wed, 2007-09-05 at 10:20 +0900, Isaku Yamahata wrote:
> > 
> > How about this option?
> > - Allocate pseudo physical contiguous region from the end of 
> >   conventional memory and relinquish at somewhere of the booting
> >   process. It would be almost the same effect ot reduce dom0 size by xen.
> 
>    I'm not sure I see where the advantage is here.  If xen doesn't have
> enough free memory to allocate the contiguous region, how does moving
> dom0 memory help that?  It might make sense to do this from the
> standpoint of preserving low memory and making it more likely that a
> contiguous region for low memory can be created, but I don't see the
> advantage in the case where xen is already under memory pressure.  Can
> you explain?

You're correct. This option doesn't work under memory pressure.
By using the self grant table unmap and replace,
I think we can achieve the similar result without allocation memory
from the end.
-- 
yamahata

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