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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2005-03-04 20:21:07 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2005-03-04 20:21:07 +0000 |
| commit | 5d5087363d7cdbd00fc432a1216e83a00f7139bd (patch) | |
| tree | 56492be3beb9be188f37bfa68c9bfc0e35b0961c /src/include/storage/lwlock.h | |
| parent | 5592a6cf46d60187b6f4895d2144e67d4f54fa25 (diff) | |
| download | postgresql-5d5087363d7cdbd00fc432a1216e83a00f7139bd.tar.gz | |
Replace the BufMgrLock with separate locks on the lookup hashtable and
the freelist, plus per-buffer spinlocks that protect access to individual
shared buffer headers. This requires abandoning a global freelist (since
the freelist is a global contention point), which shoots down ARC and 2Q
as well as plain LRU management. Adopt a clock sweep algorithm instead.
Preliminary results show substantial improvement in multi-backend situations.
Diffstat (limited to 'src/include/storage/lwlock.h')
| -rw-r--r-- | src/include/storage/lwlock.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/include/storage/lwlock.h b/src/include/storage/lwlock.h index eb02eb8a2a..50c029cc8b 100644 --- a/src/include/storage/lwlock.h +++ b/src/include/storage/lwlock.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/storage/lwlock.h,v 1.16 2004/12/31 22:03:42 pgsql Exp $ + * $PostgreSQL: pgsql/src/include/storage/lwlock.h,v 1.17 2005/03/04 20:21:07 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -25,7 +25,8 @@ */ typedef enum LWLockId { - BufMgrLock, + BufMappingLock, + BufFreelistLock, LockMgrLock, OidGenLock, XidGenLock, |