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Re: [Xen-devel] How to allocate a memory page in virtual memory, but doe
| To: | Lily Huang <ushuanglily@xxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] How to allocate a memory page in virtual memory, but does not use physical memory? |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Fri, 11 Aug 2006 10:27:03 +0100 |
| Delivery-date: | Fri, 11 Aug 2006 02:27:37 -0700 |
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| Thread-topic: | [Xen-devel] How to allocate a memory page in virtual memory, but does not use physical memory? |
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On 11/8/06 2:27 am, "Lily Huang" <ushuanglily@xxxxxxxxx> wrote: I am trying to allocate pages in a domU and map certain pages from Dom0. Since the pages are already in dom0's physical memory, it is desired that domu only allocate a "virtual space" for remapping, but does not need to use physical memory allocated to domu. I tried function balloon_alloc_empty_page_range() and alloc_pages(). But both of them seem to use physical memory once allocation succeed. Balloon_empty_alloc_page_range() does what you want. It frees up the RAM which was previously mapped in the virtual address range that it returns to the caller. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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