I wish to allocate a vector and use it's data pointer to allocate a zero copy buffer on the GPU. There is this cl_arm_import_memory extension which can be used to do this. But I am not sure wether its supported for all mali midgard OpenCL drivers or not.
I was going through this link and I am quite puzzled by the following lines : -
If the extension string cl_arm_import_memory_host is exposed then importing
from normal userspace allocations (such as those created via malloc) is
supported.What exactly does these lines mean ? I am specifically working on rockchip's RK3399 boards. Kindly help.
> Conceptually, running a kernel on imported host memory has roughly the same cost as unmapping a buffer, running the kernel and mapping the buffer on the CPU again.
Hi, Kevin. Can you explain this in detail? such as why unmap and map is needed?