On Wed, 18 Jul 2018, Baoquan He wrote: > > > We can still use 'kernelcore=mirror' or 'movable_node' for the usage > > > of hotplug and movable zone. If somebody shows up with a valid usecase > > > we can reconsider. > > > > > > > We actively use kernelcore=n%, I had recently added support for the option > > in the first place in 4.17. It's certainly not deprecated. > > Thanks for telling. Just for curiosity, could you tell the scenario you > are using kernelcore=n%? Since it evenly spread movable area on nodes, > we may not be able to physically hot unplug/plug RAM. > To evenly distribute ZONE_MOVABLE over a set of nodes regardless of the many memory capacities of systems that we have where individual command lines cannot be tuned. But you want to deprecate kernelcore=nn, not just the percent version, so I assume that's not the answer you're looking for. We do not enable CONFIG_MEMORY_HOTPLUG so this deprecation would break our userspace such that we cannot use ZONE_MOVABLE.
