On Wed, Mar 20, 2013 at 11:15:48AM -0400, Michael R. Hines wrote: > OK, can we make a deal? =) > > I'm willing to put in the work to perform the dynamic registration > on the destination side, > but let's go a step further and piggy-back on the effort: > > We need to couple this registration with a very small modification > to save_ram_block(): > > Currently, save_ram_block does: > > 1. is RDMA turned on? if yes, unconditionally add to next chunk > (will be made to > dynamically register on destination) > 2. is_dup_page() ? if yes, skip > 3. in xbzrle cache? if yes, skip > 4. still not sent? if yes, transmit > > I propose adding a "stub" function that adds: > > 0. is page mapped? if yes, skip (always returns true for now) > 1. same > 2. same > 3. same > 4. same > > Then, later, in a separate patch, I can implement /dev/pagemap support. > > When that's done, RDMA dynamic registration will actually take effect and > benefit from actually verifying that the page is mapped or not. > > - Michael
Mapped into guest? You mean e.g. for ballooning?
