Messages in this thread | | | Date | Thu, 04 Oct 2007 21:15:18 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: race with page_referenced_one->ptep_test_and_clear_young and pagetable setup/pulldown |
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Rik van Riel wrote: > Either of these two would work. Another alternative could be to > let test_and_clear_pte_flags have an exception table entry, where > we jump right to the next instruction if the instruction clearing > the flag fails. > > That is the essentially variant you need for Xen, except the fast > path is still exactly the same it is as when running on native > hardware. >
Hm, that wouldn't end up clearing the bit. You'd need a Xen-specific exception handler to do that, which would turn the whole thing into Xen-specific code, and you're back at adding a pv-op.
J
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