Horton

Save vmbuffer in heap-specific scan descriptors for on-access pruning

Melanie Plageman <melanieplageman@gmail.com>

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Commit: 99bf1f8aa6cd8029cb9ce17d4a804eed386bec97
Author: Melanie Plageman <melanieplageman@gmail.com>
Date: 2026-03-15T15:09:10Z
Releases: 19 (unreleased) 
Save vmbuffer in heap-specific scan descriptors for on-access pruning

Future commits will use the visibility map in on-access pruning to fix
VM corruption and set the VM if the page is all-visible.

Saving the vmbuffer in the scan descriptor reduces the number of times
it would need to be pinned and unpinned, making the overhead of doing so
negligible.

Author: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://postgr.es/m/C3AB3F5B-626E-4AAA-9529-23E9A20C727F%40gmail.com

Files

PathChange+/−
src/backend/access/heap/heapam.c modified +11 −1
src/backend/access/heap/heapam_handler.c modified +10 −2
src/backend/access/heap/pruneheap.c modified +5 −1
src/include/access/heapam.h modified +16 −3

Discussion