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RE: [Xen-devel] Re: Will map_domain_page return NULL when fails onx86_32
| To: | "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] Re: Will map_domain_page return NULL when fails onx86_32? |
| From: | "Li, Xin B" <xin.b.li@xxxxxxxxx> |
| Date: | Mon, 27 Feb 2006 22:13:24 +0800 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 27 Feb 2006 14:13:58 +0000 |
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| Thread-index: | AcY7pIIrROwekCuORH26HDX9YQn0NQAAD36w |
| Thread-topic: | [Xen-devel] Re: Will map_domain_page return NULL when fails onx86_32? |
>>>> 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. Quite clear, thanks, this may be helpful to accelerate __entry(). -Xin > > -- Keir > > >_______________________________________________ >Xen-devel mailing list >Xen-devel@xxxxxxxxxxxxxxxxxxx >http://lists.xensource.com/xen-devel > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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