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[Xen-devel] Re: Will map_domain_page return NULL when fails on x86_32?
| To: | "Li, Xin B" <xin.b.li@xxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: Will map_domain_page return NULL when fails on x86_32? |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Mon, 27 Feb 2006 13:48:03 +0000 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 27 Feb 2006 13:48:16 +0000 |
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| In-reply-to: | <59D45D057E9702469E5775CBB56411F101C60F93@pdsmsx406> |
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On 27 Feb 2006, at 13:34, Li, Xin B wrote: Hi Keir, just a curious question, will map_domain_pagereturn NULL whenfails on x86_32? If not, why? thanksI 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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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