[Issue]: XNACK or HSA_XNACK (or both?)

[cwpearson]

Hi AMD folks,

Looks like XNACK and HSA_XNACK are used interchangeably in the unified memory section of the docs. It would be great to clarify whether both are okay, or correct this if it's an oversight to facilitate documentation searches.

Use of simply XNACK:

HIP/docs/how-to/hip_runtime_api/memory_management/unified_memory.rst

Line 113 in 656bc13

:sup:`1` Works only with ``XNACK=1`` and kernels with HMM support. First GPU

HIP/docs/how-to/hip_runtime_api/memory_management/unified_memory.rst

Line 143 in 656bc13

GPUs, it is essential to configure the environment variable ``XNACK=1`` and use

HIP/docs/how-to/hip_runtime_api/memory_management/unified_memory.rst

Lines 162 to 165 in 656bc13

	- Allocation origin without HMM or ``XNACK=0``
	- Access outside the origin without HMM or ``XNACK=0``
	- Allocation origin with HMM and ``XNACK=1``
	- Access outside the origin with HMM and ``XNACK=1``

Use of HSA_XNACK:

HIP/docs/how-to/hip_runtime_api/memory_management/unified_memory.rst

Line 389 in 656bc13

// This example requires HMM support and the environment variable HSA_XNACK needs to be set to 1

Perhaps HSA_XNACK (or XNACK?) should also be listed under "memory management related variables" or another appropriate section of the environment variable reference.

HIP/docs/reference/env_variables.rst

Line 74 in 656bc13

Memory management related variables

[ppanchad-amd]

Hi @cwpearson. Internal ticket has been created to update docs. Thanks!

[cwpearson]

@ppanchad-amd feel free to close or leave open, whatever you prefer for your process. Thanks for the prompt attention!

[cjatin]

AFAIK it should be HSA_XNACK