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xen-devel
Re: [Xen-devel] Really need to pin page tables?
Samuel Thibault wrote:
Hello,
In extras/mini-os/arch/x86/mm.c:new_pt_frame, Mini-OS pins its L1,
L2, and L3 page tables. Does that really make a difference from the
Hypervisor point of view? I mean, once L4 is pinned, pointing to these,
and thus their content has been checked, is there any performance
difference?
Shouldn't be. Pinning an L4 implicitly pins everything else below it.
The only reason to pin the leafy parts of a pagetable is if you want to
play games with incrementally pinning the pagetable, or if you want to
pull them apart and rearrange the pieces for some reason. For example,
I do incremental pagetable pins in the Xen/pvops kernel to limit the
number of pte locks I need to hold at any one time.
J
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