On 23/04/2015 13:43, Christian Borntraeger wrote: >> > >> > Couldn't you make this a hidden kconfig option that gets automatically selected when kvm is enabled? Or is there a non-kvm case that needs it too? > For things like RHEV the default could certainly be "enabled", but for normal > distros like SLES/RHEL, the idea was to NOT enable that by default, as the non-KVM > case is more common and might suffer from the additional memory consumption of > the page tables. (big databases come to mind) > > We could think about having rpms like kvm to provide a sysctl file that sets it if we > want to minimize the impact. Other ideas? I can say what _won't_ work which is tying it to the KVM module. Nowadays it is loaded automatically via udev on the first /dev/kvm access, and that's already too late because qemu-kvm's page tables have been created already. Right? With my Fedora hat on, adding a sysctl file to the userspace RPMs (e.g. qemu) would work. CCing Cole Robinson who is the main maintainer of the Fedora virt packages. Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
