| .. SPDX-License-Identifier: GPL-2.0 |
| |
| ========== |
| Huge Pages |
| ========== |
| |
| Contiguous Memory Allocator |
| =========================== |
| CXL Memory onlined as SystemRAM during early boot is eligible for use by CMA, |
| as the NUMA node hosting that capacity will be `Online` at the time CMA |
| carves out contiguous capacity. |
| |
| CXL Memory deferred to the CXL Driver for configuration cannot have its |
| capacity allocated by CMA - as the NUMA node hosting the capacity is `Offline` |
| at :code:`__init` time - when CMA carves out contiguous capacity. |
| |
| HugeTLB |
| ======= |
| Different huge page sizes allow different memory configurations. |
| |
| 2MB Huge Pages |
| -------------- |
| All CXL capacity regardless of configuration time or memory zone is eligible |
| for use as 2MB huge pages. |
| |
| 1GB Huge Pages |
| -------------- |
| CXL capacity onlined in :code:`ZONE_NORMAL` is eligible for 1GB Gigantic Page |
| allocation. |
| |
| CXL capacity onlined in :code:`ZONE_MOVABLE` is not eligible for 1GB Gigantic |
| Page allocation. |
