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Just-in-time background writing strategy. This code avoids re-scanning

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buffers that cannot possibly need to be cleaned, and estimates how many
buffers it should try to clean based on moving averages of recent allocation
requests and density of reusable buffers.  The patch also adds a couple
more columns to pg_stat_bgwriter to help measure the effectiveness of the
bgwriter.

Greg Smith, building on his own work and ideas from several other people,
in particular a much older patch from Itagaki Takahiro.
This commit is contained in:
Tom Lane
2007-09-25 20:03:38 +00:00
parent 588901df84
commit 6f5c38dcd0
16 changed files with 447 additions and 105 deletions
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6
src/include/pgstat.h
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@ -5,7 +5,7 @@
*
* Copyright (c) 2001-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.67 2007/09/24 03:12:23 tgl Exp $
* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.68 2007/09/25 20:03:38 tgl Exp $
* ----------
*/
#ifndef PGSTAT_H
@ -294,6 +294,8 @@ typedef struct PgStat_MsgBgWriter
PgStat_Counter m_buf_written_checkpoints;
PgStat_Counter m_buf_written_clean;
PgStat_Counter m_maxwritten_clean;
PgStat_Counter m_buf_written_backend;
PgStat_Counter m_buf_alloc;
} PgStat_MsgBgWriter;
@ -394,6 +396,8 @@ typedef struct PgStat_GlobalStats
PgStat_Counter buf_written_checkpoints;
PgStat_Counter buf_written_clean;
PgStat_Counter maxwritten_clean;
PgStat_Counter buf_written_backend;
PgStat_Counter buf_alloc;
} PgStat_GlobalStats;