Il 11/04/2013 18:02, Michael R. Hines ha scritto: > Alright, so here's a slightly different management decision > which tries to accomplish all the requests, > tell me if you like it: > > 1. QEMU starts up > 2. *if and only if* chunk registration is disabled > and *if and only* RDMA is enabled > then, is_dup_page() is skipped > Otherwise, > everything is same as before, no change in code path > and no zero page capability needs to be exposed to management > > In this case there would be *no* capability for zero pages, > but we would still be able to detect the motivation of the > user indirectly through the chunk registration capability > by implying that since the capability was disabled then the > user is trying to optimize metrics for total migration time. > > On the other hand, if the chunk registration capability is > enabled, then there is no change in the code path we because > zero page checking is mandatory to take of chunk registration > in the first place. > > How does that sound? No zero page capability, but allow for > disabling only if chunk registration is disabled?
It makes sense, but I prefer to keep the code simple for this first iteration. Let's move zero page detection off the table for now. Paolo
