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Re: [Xen-devel] How much memory does a domain REALLY use...
| To: | "Graham, Simon" <Simon.Graham@xxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] How much memory does a domain REALLY use... |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Sat, 24 Feb 2007 19:38:05 +0000 |
| Delivery-date: | Sat, 24 Feb 2007 11:37:28 -0800 |
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| Thread-topic: | [Xen-devel] How much memory does a domain REALLY use... |
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On 24/2/07 19:26, "Graham, Simon" <Simon.Graham@xxxxxxxxxxx> wrote: >> Yes, there's an overhead of 7MB per 1GB on i386, and 12MB per 1GB on >> x86/64. > > What is the overhead for and where would I find it allocated? 24 bytes per 'struct page_info' and 4 bytes per machine_to_phys array entry. The former is allocated at start-of-day near the top of arch/x86/mm.c. The array of page_info structs is pointed at by 'frame_table'. The overheads on x86/64 are 40 bytes per 'struct page_info' and 8 bytes per machine_to_phys array entry. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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