Documentation/mm/hmm.rst

23 Finally, the last section presents a new migration helper that allows
104 Shared address space and migration
124 main memory to device memory using existing migration mechanisms and everything
128 memory for the device memory and second to perform migration. Policy decisions
131 Note that any CPU access to a device page triggers a page fault and a migration
134 address A triggers a page fault and initiates a migration back to main memory.
260 Migration to and from device memory
295 The overall migration steps are similar to migrating NUMA pages within system
303    be held for the duration of the migration.
336    the LRU), unmapped from the process, and a special migration PTE is
367    This step is where the migration is actually "committed".
378    migration on the CPU side.
389    This step replaces the special migration page table entry with the new
432 simplify migration to and from device memory. This also means that migration