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Cache smgrnblocks() results in recovery.

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Avoid repeatedly calling lseek(SEEK_END) during recovery by caching
the size of each fork.  For now, we can't use the same technique in
other processes, because we lack a shared invalidation mechanism.

Do this by generalizing the pre-existing caching used by FSM and VM
to support all forks.

Discussion: https://postgr.es/m/CAEepm%3D3SSw-Ty1DFcK%3D1rU-K6GSzYzfdD4d%2BZwapdN7dTa6%3DnQ%40mail.gmail.com
This commit is contained in:
Thomas Munro
2020-07-31 14:15:18 +12:00
parent e3931d01f3
commit c5315f4f44
6 changed files with 66 additions and 46 deletions
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2
contrib/pg_visibility/pg_visibility.c
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@ -392,7 +392,7 @@ pg_truncate_visibility_map(PG_FUNCTION_ARGS)
check_relation_relkind(rel);
RelationOpenSmgr(rel);
rel->rd_smgr->smgr_vm_nblocks = InvalidBlockNumber;
rel->rd_smgr->smgr_cached_nblocks[VISIBILITYMAP_FORKNUM] = InvalidBlockNumber;
block = visibilitymap_prepare_truncate(rel, 0);
if (BlockNumberIsValid(block))