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Implement "distributed" checkpoints in which the checkpoint I/O is spread

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over a fairly long period of time, rather than being spat out in a burst.
This happens only for background checkpoints carried out by the bgwriter;
other cases, such as a shutdown checkpoint, are still done at full speed.

Remove the "all buffers" scan in the bgwriter, and associated stats
infrastructure, since this seems no longer very useful when the checkpoint
itself is properly throttled.

Original patch by Itagaki Takahiro, reworked by Heikki Linnakangas,
and some minor API editorialization by me.
This commit is contained in:
Tom Lane
2007-06-28 00:02:40 +00:00
parent b09c248bdd
commit 867e2c91a0
22 changed files with 760 additions and 463 deletions
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16
src/backend/commands/dbcommands.c
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@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.195 2007/06/01 19:38:07 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/dbcommands.c,v 1.196 2007/06/28 00:02:38 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -401,10 +401,9 @@ createdb(const CreatedbStmt *stmt)
/*
* Force dirty buffers out to disk, to ensure source database is
* up-to-date for the copy. (We really only need to flush buffers for the
* source database, but bufmgr.c provides no API for that.)
* up-to-date for the copy.
*/
BufferSync();
FlushDatabaseBuffers(src_dboid);
/*
* Once we start copying subdirectories, we need to be able to clean 'em
@ -507,7 +506,7 @@ createdb(const CreatedbStmt *stmt)
* Perhaps if we ever implement CREATE DATABASE in a less cheesy way,
* we can avoid this.
*/
RequestCheckpoint(true, false);
RequestCheckpoint(CHECKPOINT_IMMEDIATE | CHECKPOINT_FORCE | CHECKPOINT_WAIT);
/*
* Close pg_database, but keep lock till commit (this is important to
@ -661,7 +660,7 @@ dropdb(const char *dbname, bool missing_ok)
* open files, which would cause rmdir() to fail.
*/
#ifdef WIN32
RequestCheckpoint(true, false);
RequestCheckpoint(CHECKPOINT_IMMEDIATE | CHECKPOINT_FORCE | CHECKPOINT_WAIT);
#endif
/*
@ -1424,10 +1423,9 @@ dbase_redo(XLogRecPtr lsn, XLogRecord *record)
/*
* Force dirty buffers out to disk, to ensure source database is
* up-to-date for the copy. (We really only need to flush buffers for
* the source database, but bufmgr.c provides no API for that.)
* up-to-date for the copy.
*/
BufferSync();
FlushDatabaseBuffers(xlrec->src_db_id);
/*
* Copy this subdirectory to the new location