On Tue, Aug 11, 2015 at 5:55 PM, Paolo Bonzini <pbonz...@redhat.com> wrote: > > > On 11/08/2015 17:54, alvise rigo wrote: >> This can lead to an excessive rate of flush requests, since for one >> CPU that removes the TLB_EXCL flag, all the others that are competing >> for the same excl address will need to flush the entire cache and >> start all over again. > > Why flush the entire cache (I understand you mean TLB)?
Sorry, I meant the TLB. If for each removal of an exclusive entry we set also the bit to 1, we force the following LL to make a tlb_flush() on every vCPU. alvise > > Paolo > >> If for a start we want to have a simpler implementation, I can revert >> back to the one-bit design.
