Function: unmap_mem

Applicable Products

Product

Supported (√/x)

Ascend 950PR/Ascend 950DT

√

Atlas A3 training products/Atlas A3 inference products

√

Atlas A2 training products/Atlas A2 inference products

√

Atlas training products

√

Atlas inference products

√

Atlas 200I/500 A2 inference products

√

Description

Unmaps virtual memory from physical memory.

This API needs to work with other APIs to allocate virtual memory with consecutive addresses and maximize the use of physical memory.
  1. Call acl.rt.reserve_mem_address to allocate virtual memory.
  2. Call acl.rt.malloc_physical to allocate physical memory.
  3. Call acl.rt.map_mem to map the virtual memory to the physical memory.
  4. Call specific task APIs to execute tasks.
  5. Call acl.rt.unmap_mem to unmap the virtual memory from the physical memory.
  6. Call acl.rt.free_physical to free the physical memory.
  7. Call acl.rt.release_mem_address to free the virtual memory.

Prototype

Parameters

Parameter

Description

vir_ptr

Int, virtual address to be unmapped.

Return Values

Return Value

Description

ret

Int, error code. 0 on success; else, failure.

Restrictions

This API is not supported in the Ascend RC form.

Parent topic: Virtual Memory Management