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[Xen-devel] Different: nr_pages vs. max_pfn
| To: | "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
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| Subject: | [Xen-devel] Different: nr_pages vs. max_pfn |
| From: | "Y. D." <duyuyang@xxxxxxxxx> |
| Date: | Wed, 19 Nov 2008 17:45:50 +0800 |
| Delivery-date: | Wed, 19 Nov 2008 01:46:14 -0800 |
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Hi, In start_info, there is a field nr_pages definig how much memory is allocated to the domain, which is obvious. While in shared_info, there is a field max_pfn. I don't know why max_pfn is not equal to nr_pages. Say for 32MB memory, nr_pages = 8192, while max_pfn = 10240 (may vary?), of which 2048 pfn's have invalid mfn. Can anybody explain that why max_pfn is larger? Is it static or dynamic? Furture, does pfn to mfn frame mapping ever change? Hopefully not. Thanks, Shawn _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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