Re: [Xen-devel] [RFC PATCH] page_alloc: use first half of higher order chunks when halving

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-04-02 at 08:52 +0100, Jan Beulich wrote:
> >>> On 02.04.14 at 02:17, <mvrushton@xxxxxxxxx> wrote:
> > On 04/01/14 05:22, Tim Deegan wrote:
> >> As long as we don't also change the default allocation order in
> >> Xen. :)  In general, linux shouldn't rely on the order that Xen
> >> allocates memory, as that might change later.  If the current API
> >> can't do what's needed, maybe we can add another allocator
> >> hypercall or flag?
> > 
> > Agree on not relying on the order in the long run. A new hypercall or 
> > flag seems like overkill right now. The question for me comes down to my 
> > proposed change which is more simple and solves the short term problem 
> > or investing time in reworking the Linux code to make large allocations.
> 
> I think it has become pretty clear by now that we'd rather not alter
> the hypervisor allocator for a purpose like this.

Does it even actually solve the problem? It seems like it is just
deferring it until sufficient fragmentation has occurred in the system.
All its really done is make the eventual issue much harder to debug.

Ian.



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