Messages in this thread | | | Date | Mon, 22 Feb 2021 15:02:31 +0100 | From | Michal Hocko <> | Subject | Re: [PATCH RFC] mm/madvise: introduce MADV_POPULATE to prefault/prealloc memory |
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On Mon 22-02-21 14:22:37, David Hildenbrand wrote: > > > 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".
Sorry for being dense here but I still do not follow. If you do not want to read then what do you want to populate from? Only map if it is in the page cache? -- Michal Hocko SUSE Labs
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