On 20/09/2017 13:46, Alexey Kardashevskiy wrote: > This extends memory_region_transaction_commit() to receive a MR as > if it is a root MR or its topmost parent is, then we can only rebuild > its FlatView and update it for address spaces sharing it. > > The optimization gets disabled though if there is full update about to > commit. > > memory_region_set_enabled() is a special case here, it does not use > a hint when MR is being disabled. > > On POWER8 with 255 CPUs, 255 virtio-net, 40 PCI bridges guest this brings > down the boot time from 20s to 12s, the total memory footprint > goes down (17G -> 8G).
I think this is incorrect if MR has an alias (no matter if enabling or disabling)? Paolo
