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

From: Avi Kivity
Date: Wed Jun 22 2011 - 07:31:32 EST

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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