Hi,
Pinned memory can be shared between CPU and GPU but the performance may not always fast.
The zero-copy allocates the physical location of memory is pinned in the CPU system memory.
So, a program may have fast or slow access to it depending on where it is being accessed from.
It’s recommended to use unified memory instead.
CUDA driver can automatically handle the synchronization and pick a better location for you.
Here is our document for Jetson memory system for your reference:
https://docs.nvidia.com/cuda/cuda-for-tegra-appnote/index.html#memory-management
Thanks.