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Avoid repeating loads of frozen ID values.

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Repeating loads of inplace-updated fields tends to cause bugs like the
one from the previous commit.  While there's no bug to fix in these code
sites, adopt the load-once style.  This improves the chance of future
copy/paste finding the safe style.

Discussion: https://postgr.es/m/20240423003956.e7.nmisch@google.com
This commit is contained in:
Noah Misch
2024-04-29 10:25:33 -07:00
parent f65ab862e3
commit dd0183469b
4 changed files with 34 additions and 21 deletions
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4
src/backend/commands/vacuum.c
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@@ -1200,7 +1200,7 @@ vacuum_get_cutoffs(Relation rel, const VacuumParams *params,
aggressiveXIDCutoff = nextXID - freeze_table_age;
if (!TransactionIdIsNormal(aggressiveXIDCutoff))
aggressiveXIDCutoff = FirstNormalTransactionId;
if (TransactionIdPrecedesOrEquals(rel->rd_rel->relfrozenxid,
if (TransactionIdPrecedesOrEquals(cutoffs->relfrozenxid,
aggressiveXIDCutoff))
return true;
@@ -1221,7 +1221,7 @@ vacuum_get_cutoffs(Relation rel, const VacuumParams *params,
aggressiveMXIDCutoff = nextMXID - multixact_freeze_table_age;
if (aggressiveMXIDCutoff < FirstMultiXactId)
aggressiveMXIDCutoff = FirstMultiXactId;
if (MultiXactIdPrecedesOrEquals(rel->rd_rel->relminmxid,
if (MultiXactIdPrecedesOrEquals(cutoffs->relminmxid,
aggressiveMXIDCutoff))
return true;