Messages in this thread | | | Date | Fri, 16 Mar 2007 10:08:43 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [patch 15/26] Xen-paravirt_ops: Add apply_to_page_range() which applies a function to a pte range. |
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Ingo Molnar wrote: > nice one! I suspect we could simplify some of the less > performance-critical open-coded pagetable walker loops in the kernel > with this? (i'm not even sure it's all that much of a performance loss > to pass a function pointer around - would be nice to convert say > mprotect() to this and see the performance difference?) >
apply_page_to_range has the side-effect of allocating all the pagetable levels for the address range it walks. Xen uses this to populate pagetables (for example, build out the pagetable, and let the hypervisor plug a mapping into the pte page).
If that's OK for the other uses, then it should be good.
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