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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2001-09-29 04:02:27 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2001-09-29 04:02:27 +0000 |
| commit | 499abb0c0f21cb861c5af1d49a06469f3cfcc1eb (patch) | |
| tree | 0af6262d9b6d1159315e93e90e69047b959ea5f5 /src/backend/commands/vacuumlazy.c | |
| parent | 818fb55ac49b4b20e65d9899fc1784e54e86db58 (diff) | |
| download | postgresql-499abb0c0f21cb861c5af1d49a06469f3cfcc1eb.tar.gz | |
Implement new 'lightweight lock manager' that's intermediate between
existing lock manager and spinlocks: it understands exclusive vs shared
lock but has few other fancy features. Replace most uses of spinlocks
with lightweight locks. All remaining uses of spinlocks have very short
lock hold times (a few dozen instructions), so tweak spinlock backoff
code to work efficiently given this assumption. All per my proposal on
pghackers 26-Sep-01.
Diffstat (limited to 'src/backend/commands/vacuumlazy.c')
| -rw-r--r-- | src/backend/commands/vacuumlazy.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/backend/commands/vacuumlazy.c b/src/backend/commands/vacuumlazy.c index 3685217fb7..38405f6c6c 100644 --- a/src/backend/commands/vacuumlazy.c +++ b/src/backend/commands/vacuumlazy.c @@ -31,7 +31,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/commands/vacuumlazy.c,v 1.7 2001/09/21 03:32:35 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/commands/vacuumlazy.c,v 1.8 2001/09/29 04:02:22 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -53,7 +53,7 @@ * A page with less than PAGE_SPACE_THRESHOLD free space will be forgotten * immediately, and not even passed to the free space map. Removing the * uselessly small entries early saves cycles, and in particular reduces - * the amount of time we spend holding the FSM spinlock when we finally call + * the amount of time we spend holding the FSM lock when we finally call * MultiRecordFreeSpace. Since the FSM will ignore pages below its own * runtime threshold anyway, there's no point in making this really small. * XXX Is it worth trying to measure average tuple size, and using that to |