Path: blob/master/Documentation/driver-api/cxl/allocation/hugepages.rst
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.. 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.