Sharing pages between mappings

In the memory-management subsystem, the term "mapping" refers to the connection between pages in memory and their backing store — the file that represents them on disk. One of the fundamental assumptions in the kernel is that a given page in the page cache belongs to exactly one mapping. But, as Miklos Szeredi explained in a plenary session at the 2017 Linux Storage, Filesystem, and Memory-Management Summit, there are situations where it would be desirable to associate the same page with multiple mappings. Achieving this goal may not be easy, though.

Click below (subscribers only) for continuing coverage from LSFMM 2017

Full Story (comments: 9)