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    SubjectRe: [PATCH 1/4] Pte drop ptep_get_and_clear paravirt op.patch
    Zachary Amsden wrote:
    > In shadow mode hypervisors, ptep_get_and_clear achieves the desired
    > purpose of keeping the shadows in sync by issuing a native_get_and_clear,
    > followed by a call to pte_update, which indicates the PTE has been
    > modified.
    >
    > Direct mode hypervisors (Xen) have no need for this anyway, and will trap
    > the update using writable pagetables.
    >

    Jan Beulich just posted a patch for Xen/linux which specialzes
    ptep_get_and_clear, which apparently improves kernel-compile performance
    by 25-30% on some configurations. I think we'll want to keep this.

    J
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