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




On 27 Feb 2006, at 13:34, Li, Xin B wrote:

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

The unmap is a must. After unmap the mapping is put in a per-vcpu lookup table to allow fast reuse. When it is evicted from that table then it is freed.

 -- Keir


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