[Xen-devel] Re: non-contiguous allocations

[Olaf Hering <olaf@xxxxxxxxx>]

On Mon, Apr 18, Olaf Hering wrote:

> On Fri, Apr 01, George Dunlap wrote:
> 
> > On Wed, 2011-03-30 at 19:04 +0100, Olaf Hering wrote:
> > > Using the u16 means each cpu could in theory use up to 256MB as trace
> > > buffer. However such a large allocation will currently fail on x86 due
> > > to the MAX_ORDER limit.
> > 
> > FWIW, I don't believe that there's any reason the allocations have to be
> > contiguous any more.  I kept them contiguous to minimize the changes to
> > the moving parts near a release.  But the new system has been pretty
> > well tested now, so I think looking at non-contiguous allocations may be
> > worthwhile.

Is there a way to allocate more than 128mb with repeated calls to
alloc_xenheap_page()?  From which pool should the per-cpu tracebuffers
get allocated?  alloc_domheap_page() wants a domain, so I think thats
the wrong interface.

Olaf

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