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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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13
src/include/access/xlog.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.78 2007/05/30 20:12:02 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.79 2007/06/28 00:02:39 tgl Exp $
*/
#ifndef XLOG_H
#define XLOG_H
@@ -157,6 +157,14 @@ extern const char XLOG_sync_method_default[];
extern bool XLOG_DEBUG;
#endif
/* OR-able flags for RequestCheckpoint, CreateCheckPoint and subsidiaries */
#define CHECKPOINT_IS_SHUTDOWN 0x0001 /* Checkpoint is for shutdown */
#define CHECKPOINT_IMMEDIATE 0x0002 /* Do it without delays */
#define CHECKPOINT_FORCE 0x0004 /* Force even if no activity */
#define CHECKPOINT_WARNONTIME 0x0008 /* Enable CheckPointWarning */
#define CHECKPOINT_WAIT 0x0010 /* Wait for completion */
extern XLogRecPtr XLogInsert(RmgrId rmid, uint8 info, XLogRecData *rdata);
extern void XLogFlush(XLogRecPtr RecPtr);
extern bool XLogNeedsFlush(XLogRecPtr RecPtr);
@@ -171,9 +179,10 @@ extern void BootStrapXLOG(void);
extern void StartupXLOG(void);
extern void ShutdownXLOG(int code, Datum arg);
extern void InitXLOGAccess(void);
extern void CreateCheckPoint(bool shutdown, bool force);
extern void CreateCheckPoint(int flags);
extern void XLogPutNextOid(Oid nextOid);
extern XLogRecPtr GetRedoRecPtr(void);
extern XLogRecPtr GetInsertRecPtr(void);
extern void GetNextXidAndEpoch(TransactionId *xid, uint32 *epoch);
#endif /* XLOG_H */