[Xen-devel] RE: Will map_domain_page return NULL when fails on x86_32?

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

>> Hi Keir, just a curious question, will map_domain_page 
>return NULL when
>> fails on x86_32? If not, why?
>> thanks
>
>I don't expect that it should ever fail. It's used for temporary 
>mappings (e.g., scope of a function) and so even though the mapping 
>space is finite, we shouldn't ever exhaust it.

So the unmap is not a must?
Can you explain the mechanism of garbage collection here?
Thanks
-Xin

>
>The map_domain_page_global() space is a different matter...
>
>  -- Keir
>

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