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Implement new 'lightweight lock manager' that's intermediate between

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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.
This commit is contained in:
Tom Lane
2001-09-29 04:02:27 +00:00
parent 818fb55ac4
commit 499abb0c0f
46 changed files with 1595 additions and 1355 deletions
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4
doc/src/sgml/wal.sgml
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<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.10 2001/09/22 03:59:17 momjian Exp $ -->
<!-- $Header: /cvsroot/pgsql/doc/src/sgml/wal.sgml,v 1.11 2001/09/29 04:02:19 tgl Exp $ -->
<chapter id="wal">
<title>Write-Ahead Logging (<acronym>WAL</acronym>)</title>
@ -146,7 +146,7 @@
<para>
The <acronym>WAL</acronym> buffers and control structure are in
shared memory, and are handled by the backends; they are protected
by spinlocks. The demand on shared memory is dependent on the
by lightweight locks. The demand on shared memory is dependent on the
number of buffers; the default size of the <acronym>WAL</acronym>
buffers is 64 kB.
</para>