tree bf26a30ecd876824bcc2921a39616f28f4389fd4
parent acc6bcdc504ad2e8c09a628dc18de0067f7344b8
author Hansang Bae <hansang.bae@intel.com> 1743632190 -0500
committer GitHub <noreply@github.com> 1743632190 -0500
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[OpenMP] 6.0 (TR11) Memory Management Update (#97106)

TR11 introduced changes to support target memory management in a unified
way by defining a series of API routines and additional traits. Host
runtime is oblivious to how actual memory resources are mapped when
using the new API routines, so it can only support how the composed
memory space is maintained, and the offload backend must handle which
memory resources are actually used to allocate memory from the memory
space.

Here is summary of the implementation.
* Implemented 12 API routines to get/mainpulate memory space/allocator.
* Memory space composed with a list of devices has a state with resource
description, and runtime is responsible for maintaining the allocated
memory space objects.
* Defined interface with offload runtime to access memory resource list,
and to redirect calls to omp_alloc/omp_free since it requires
backend-specific information.
* Value of omp_default_mem_space changed from 0 to 99, and
omp_null_mem_space took the value 0 as defined in the language.
* New allocator traits were introduced, but how to use them is up to the
offload backend.
* Added basic tests for the new API routines.