Messages in this thread | | | Date | Thu, 25 Aug 2011 10:21:11 -0300 | From | Marcelo Tosatti <> | Subject | Re: [PATCH 11/11] KVM: MMU: improve write flooding detected |
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On Thu, Aug 25, 2011 at 07:42:10AM +0300, Avi Kivity wrote: > 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.
The following could be required to consider a valid gpte, for write flood detection purposes:
- Must be present. - PageCacheDisable must be unset. - PageWriteThrough must be unset.
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