Messages in this thread | | | Date | Wed, 22 Jun 2011 14:31:11 +0300 | From | Avi Kivity <> | Subject | Re: [PATCH] mmu_notifier, kvm: Introduce dirty bit tracking in spte and mmu notifier to help KSM dirty bit tracking |
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On 06/22/2011 02:28 PM, Avi Kivity wrote: > > Actually, this is dangerous. If we use the dirty bit for other > things, we will get data corruption. > > For example we might want to map clean host pages as writeable-clean > in the spte on a read fault so that we don't get a page fault when > they get eventually written. >
Another example - we can use the dirty bit for dirty page loggging.
So I think we can get away with a conditional tlb flush - only flush if the page was dirty. That should be rare after the first pass, at least with small pages.
-- error compiling committee.c: too many arguments to function
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