Here is the results of looking at the cudaPointerGetAttributes
of different allocation types on Grace + Hopper. Allocations
of `malloc` are still usable on the GPU.
```
ccudaPointerGetAttributes attributes malloc ptr
  is_dev_ptr  -> 1
  is_host_ptr -> 1
  memory loc  -> unregistered

cudaPointerGetAttributes attributes cudaMalloc ptr
  is_dev_ptr  -> 1
  is_host_ptr -> 0
  memory loc  -> device

cudaPointerGetAttributes attributes cudaMallocManaged cudaMemAttachGlobal ptr
  is_dev_ptr  -> 1
  is_host_ptr -> 1
  memory loc  -> managed

```