Messages in this thread | | | Date | Mon, 2 Jun 2008 13:25:08 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] xen: avoid hypercalls when updating unpinned pud/pmd |
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* Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> When operating on an unpinned pagetable (ie, one under construction or > destruction), it isn't necessary to use a hypercall to update a > pud/pmd entry. Jan Beulich observed that a similar optimisation > avoided many thousands of hypercalls while doing a kernel build. > > One tricky part is that early in the kernel boot there's no page > structure, so we can't check to see if the page is pinned. In that > case, we just always use the hypercall. > > Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> > Cc: Jan Beulich <jbeulich@novell.com>
applied to tip/x86/xen, thanks Jeremy.
Ingo
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