* Pradeep Kiruvale (pradeepkiruv...@gmail.com) wrote: > Hi All, > > Is it possible to enable/disable to migration features on the fly for a > qemu VM? > I mean through qmp interface kind of a interface? > > I am asking this because keeping the dirty memory list, this could consume > some > compute and memory. So, the plan is to enable when the VM needs to be > migrated. > > Please clarify.
These bitmaps should already only be allocated during the migration process, so you shouldn't be seeing any overhead during normal running. See migration/ram.c ram_save_setup->ram_state_init which allocates ram_bitmap and that only happens at the start of migration. ram_state_init also calls memory_global_dirty_log_start which does the kernel side of it. Dave > Regards, > Pradeep -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
