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RE: [Xen-devel] Regarding page table management changes from Xen v1to Xe
| To: | "Himanshu Raj" <rhim@xxxxxxxxxxxxx>, "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] Regarding page table management changes from Xen v1to Xen v2 (and v3) |
| From: | "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx> |
| Date: | Wed, 26 Apr 2006 19:04:03 +0100 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Wed, 26 Apr 2006 11:04:26 -0700 |
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| Thread-index: | AcZpWvB6Yt09f8GOQ0a1cgTaTVCWWwAAGFwg |
| Thread-topic: | [Xen-devel] Regarding page table management changes from Xen v1to Xen v2 (and v3) |
> In another example, mmapped access to a file, the new > approach will incur these two extra faults for every page > fault required to bring a file page to page cache, right? No, these singleton updates on the Linux demand fault path are issued with the update_va_mapping hypercall. This is possible because the virtual address that the pte maps is known, so its possible for Xen to use a linear pagetable to do the update rather than creating an on-demand mapping to the domain's pagetable page. This is an important optimization on 32b where Xen address space is tight. Ian _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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