Use bump context for TID bitmaps stored by vacuum Vacuum does not pfree individual entries, and only frees the entire storage space when finished with it. This allows using a bump context, eliminating the chunk header in each leaf allocation. Most leaf allocations will be 16 to 32 bytes, so that's a significant savings. TidStoreCreateLocal gets a boolean parameter to indicate that the created store is insert-only.
This requires a separate tree context for iteration, since we free the iteration state after iteration completes. Discussion: https://postgr.es/m/CANWCAZac%3DpBePg3rhX8nXkUuaLoiAJJLtmnCfZsPEAS4EtJ%3Dkg%40mail.gmail.com Discussion: https://postgr.es/m/canwcazzqffxvzo8yzhfwtqv+z2gamv1ku16vu7kwmb5kzqy...@mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/8a1b31e6e59631807a08a4e9465134c343bbdf5e Modified Files -------------- src/backend/access/common/tidstore.c | 15 +++++++++++++-- src/backend/access/heap/vacuumlazy.c | 4 ++-- src/include/access/tidstore.h | 2 +- src/include/lib/radixtree.h | 11 ++++++++++- src/test/modules/test_tidstore/test_tidstore.c | 3 ++- 5 files changed, 28 insertions(+), 7 deletions(-)
