Messages in this thread | ![/](/images/icornerl.gif) | | Date | Fri, 5 Oct 2007 09:17:16 -0400 | From | Rik van Riel <> | Subject | Re: race with page_referenced_one->ptep_test_and_clear_young and pagetable setup/pulldown |
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On Thu, 04 Oct 2007 21:15:18 -0700 Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> 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.
Big deal. We don't care *that* much.
As long as the bit gets cleared 99.9% of the time, we're fine. All that bit is for is determining when to swap out a page.
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