Michal Clapinski wrote: > Currently, the user has to specify each memory region to be used with > nvdimm via the memmap parameter. Due to the character limit of the > command line, this makes it impossible to have a lot of pmem devices. > This new parameter solves this issue by allowing users to divide > one e820 entry into many nvdimm regions. > > This change is needed for the hypervisor live update. VMs' memory will > be backed by those emulated pmem devices. To support various VM shapes > I want to create devdax devices at 1GB granularity similar to hugetlb.
Why is it not sufficient to create a region out of a single memmap range and create multiple 1G dax devices within that single range? Ira > > It's also possible to expand this parameter in the future, > e.g. to specify the type of the device (fsdax/devdax). > > Signed-off-by: Michal Clapinski <mclapin...@google.com> [snip]
