Re: [Xen-devel] Baffled by multipage_allocation_permitted()

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> Dave McCracken <dcm@xxxxxxxx> 16.06.09 15:10 >>>
>Out of curiosity, why is it necessary to restrict the size of multipage 
>allocations at all?  I'd think the memory size limits would adequately protect 
>against any guest going wild with it.  What harm could come from, for example, 
>a guest asking for a 16M contiguous page?  I don't know of any current need 
>for such a thing.  I'm just wondering why we restrict it.

Because contiguous memory is a more precious resource than just individual
pages, and allocations strictly needing multiple contiguous pages should not
fail because of a random guest doing odd things.

Jan


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