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[Xen-devel] difference between alloc_vm_area() and balloon_alloc_empty_p
| To: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] difference between alloc_vm_area() and balloon_alloc_empty_page_range() |
| From: | "Lily Huang" <ushuanglily@xxxxxxxxx> |
| Date: | Mon, 10 Jul 2006 10:50:19 -0400 |
| Delivery-date: | Mon, 10 Jul 2006 07:51:20 -0700 |
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When I read the blkfront.c and blkback.c, I noticed that in some places (e.g, map_frontend_page()) it uses alloc_vm_area() to allocate memory for foreign page mapping. However, in some other places, it used balloon_alloc_empty_page_range() to allocate memory for mapping. What's the difference between these two functions? Why not just use one function like alloc_vm_area() or balloon_alloc_empty_page_range()? More important, I noticed that with alloc_vm_area(), it requires lock_vm_area() to lock down the vm area. Why do we need this? Why don't we need some locking mechanisms on memory allocated with balloon_alloc_empty_page_range()? thanks in advance for your kind help! lily _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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