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| author | Robert Haas <rhaas@postgresql.org> | 2016-04-08 02:04:46 -0400 |
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| committer | Robert Haas <rhaas@postgresql.org> | 2016-04-08 02:04:46 -0400 |
| commit | 719c84c1be51f3d3fe6049b77ddbaa0c4b58a9a9 (patch) | |
| tree | c2f4b1501655e50339e3365f267fcce00fd06bbb /src/include/storage/lmgr.h | |
| parent | 8643b91ecf8f47a1307df4a00d66b2fceada0d6f (diff) | |
| download | postgresql-719c84c1be51f3d3fe6049b77ddbaa0c4b58a9a9.tar.gz postgresql-719c84c1be51f3d3fe6049b77ddbaa0c4b58a9a9.zip | |
Extend relations multiple blocks at a time to improve scalability.
Contention on the relation extension lock can become quite fierce when
multiple processes are inserting data into the same relation at the same
time at a high rate. Experimentation shows the extending the relation
multiple blocks at a time improves scalability.
Dilip Kumar, reviewed by Petr Jelinek, Amit Kapila, and me.
Diffstat (limited to 'src/include/storage/lmgr.h')
| -rw-r--r-- | src/include/storage/lmgr.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/include/storage/lmgr.h b/src/include/storage/lmgr.h index 975b6f8155d..8288e7d5054 100644 --- a/src/include/storage/lmgr.h +++ b/src/include/storage/lmgr.h @@ -53,6 +53,9 @@ extern void UnlockRelationIdForSession(LockRelId *relid, LOCKMODE lockmode); /* Lock a relation for extension */ extern void LockRelationForExtension(Relation relation, LOCKMODE lockmode); extern void UnlockRelationForExtension(Relation relation, LOCKMODE lockmode); +extern bool ConditionalLockRelationForExtension(Relation relation, + LOCKMODE lockmode); +extern int RelationExtensionLockWaiterCount(Relation relation); /* Lock a page (currently only used within indexes) */ extern void LockPage(Relation relation, BlockNumber blkno, LOCKMODE lockmode); |