Messages in this thread | | | Date | Thu, 18 Sep 2008 17:00:59 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: Populating multiple ptes at fault time |
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Avi Kivity wrote: >> Yes. At worst Linux would underestimate the process RSS a bit >> (depending on how many unsynchronized ptes you leave lying around). I >> > > Not the RSS (that's pte.present pages) but the working set (aka active > list).
Yep.
>> bet there's an appropriate pvop hook you could use to force >> synchronization just before the kernel actually inspects the bits >> (leaving lazy mode sounds good). >> > > It would have to be a new lazy mode, not the existing one, I think.
The only direct use of pte_young() is in zap_pte_range, within a mmu_lazy region. So syncing the A bit state on entering lazy mmu mode would work fine there.
The call via page_referenced_one() doesn't seem to have a very convenient hook though. Perhaps putting something in page_check_address() would do the job.
J
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