lkml.org 
[lkml]   [2021]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH RFC] mm/madvise: introduce MADV_POPULATE to prefault/prealloc memory
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

\
 
 \ /
  Last update: 2021-02-22 15:29    [W:0.055 / U:13.992 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site