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[$] Sharing memory for shared file extents

Tuesday May 24, 2022. 07:19 PM , from LWN.net
On the second day of the
2022 Linux Storage,
Filesystem, Memory-management and BPF Summit (LSFMM), Goldwyn Rodrigues
led a
combined filesystem and memory-management session on saving memory when
reading files that share extents. That kind of sharing can occur with
copy-on-write (COW) filesystems, reflinks, snapshots, and other features
of that sort. When reading those files, memory is wasted because multiple
copies of the same data is stored in the page cache, so he wanted to
explore adding a cache
specifically to handle that.
https://lwn.net/Articles/895907/
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