Re: [PATCH RFC] mm/madvise: introduce MADV_POPULATE to prefault/prealloc memory

David Hildenbrand
2021-02-22T13:26:50Z

>> Exactly. But for hugetlbfs/shmem ("!RAM-backed files") this is not what we
>> want.
>
> OK, then I must have misread your requirements. Maybe I just got lost in
> all the combinations you have listed.

Another special case could be dax/pmem I think. You might want to fault
it in readable/writable but not perform an actual read/write unless
really required.

QEMU phrases this as "don't cause wear on the storage backing".

--
Thanks,

David / dhildenb