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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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4
src/backend/catalog/storage.c
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@@ -290,8 +290,8 @@ RelationTruncate(Relation rel, BlockNumber nblocks)
* Make sure smgr_targblock etc aren't pointing somewhere past new end
*/
rel->rd_smgr->smgr_targblock = InvalidBlockNumber;
rel->rd_smgr->smgr_fsm_nblocks = InvalidBlockNumber;
rel->rd_smgr->smgr_vm_nblocks = InvalidBlockNumber;
for (int i = 0; i <= MAX_FORKNUM; ++i)
rel->rd_smgr->smgr_cached_nblocks[i] = InvalidBlockNumber;
/* Prepare for truncation of MAIN fork of the relation */
forks[nforks] = MAIN_FORKNUM;