On Wed, Nov 27, 2024 at 4:41 PM Andres Freund <and...@anarazel.de> wrote: > Strictly speaking we don't actually need to map shared buffers to the same > location in each process... We do need that for most other uses of shared > memory, including the buffer mapping table, but not for the buffer data > itself.
Well, if it can move, then you have to make sure it doesn't move while someone's holding onto a pointer into it. I'm not exactly sure how hard it is to guarantee that, but we certainly do construct pointers into shared_buffers and use them at least for short periods of time, so it's not a purely academic concern. -- Robert Haas EDB: http://www.enterprisedb.com
