f9af3c16bf
[WHY] Unified memory with xnack off should be tracked, as userptr mappings and legacy allocations do. To avoid oversuscribe system memory when xnack off. [How] Exposing functions reserve_mem_limit and unreserve_mem_limit to SVM API and call them on every prange creation and free. Signed-off-by: Alex Sierra <alex.sierra@amd.com> Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>