Clamp result of MultiXactMemberFreezeThreshold
authorHeikki Linnakangas <heikki.linnakangas@iki.fi>
Thu, 13 Jun 2024 16:01:30 +0000 (19:01 +0300)
committerHeikki Linnakangas <heikki.linnakangas@iki.fi>
Thu, 13 Jun 2024 16:03:00 +0000 (19:03 +0300)
commita5662ba345e732c1f714409b38b75be98105aab6
treedb1cc6836fb544988740ed058c74ffbeab794e68
parentca947649208ce7343c54c8f92e67ea9274be812c
Clamp result of MultiXactMemberFreezeThreshold

The purpose of the function is to reduce the effective
autovacuum_multixact_freeze_max_age if the multixact members SLRU is
approaching wraparound, to make multixid freezing more aggressive.
The returned value should therefore never be greater than plain
autovacuum_multixact_freeze_max_age.

Reviewed-by: Robert Haas
Discussion: https://www.postgresql.org/message-id/85fb354c-f89f-4d47-b3a2-3cbd461c90a3@iki.fi
Backpatch-through: 12, all supported versions
src/backend/access/transam/multixact.c