Re: [PATCH RFC] mm/madvise: introduce MADV_POPULATE to prefault/prealloc memory
From: Michal Hocko <mhocko@suse.com>
Date: 2021-02-22 14:24:32
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linux-alpha, linux-arch, linux-mips, lkml
On Mon 22-02-21 14:22:37, David Hildenbrand wrote:
quoted
quoted
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