Re: [PATCH] mmu_notifier, kvm: Introduce dirty bit tracking in spteand mmu notifier to help KSM dirty bit tracking

[Avi Kivity]

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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