Re: [PATCH 11/11] KVM: MMU: improve write flooding detected

Avi Kivity
2011-08-25T04:42:16Z

On 08/25/2011 05:04 AM, Marcelo Tosatti wrote:
> >
> > It could increase the flood count independently of the accessed bit of
> > the spte being updated, zapping after 3 attempts as it is now.
> >
> > But additionally reset the flood count if the gpte appears to be valid
> > (points to an existant gfn if the present bit is set, or if its zeroed).
>
> Well not zero, as thats a common pattern for non ptes.
>

On 32-bit with 4GB RAM, practically anything is a valid gpte.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.