database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-24 09:27:52 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

8
src/include/storage/bufmgr.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.104 2007/05/30 20:12:03 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.105 2007/06/28 00:02:40 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -33,9 +33,7 @@ extern DLLIMPORT int NBuffers;
/* in bufmgr.c */
extern bool zero_damaged_pages;
extern double bgwriter_lru_percent;
extern double bgwriter_all_percent;
extern int bgwriter_lru_maxpages;
extern int bgwriter_all_maxpages;
/* in buf_init.c */
extern DLLIMPORT char *BufferBlocks;
@@ -136,11 +134,12 @@ extern char *ShowBufferUsage(void);
extern void ResetBufferUsage(void);
extern void AtEOXact_Buffers(bool isCommit);
extern void PrintBufferLeakWarning(Buffer buffer);
extern void FlushBufferPool(void);
extern void CheckPointBuffers(int flags);
extern BlockNumber BufferGetBlockNumber(Buffer buffer);
extern BlockNumber RelationGetNumberOfBlocks(Relation relation);
extern void RelationTruncate(Relation rel, BlockNumber nblocks);
extern void FlushRelationBuffers(Relation rel);
extern void FlushDatabaseBuffers(Oid dbid);
extern void DropRelFileNodeBuffers(RelFileNode rnode, bool istemp,
BlockNumber firstDelBlock);
extern void DropDatabaseBuffers(Oid dbid);
@@ -161,7 +160,6 @@ extern void LockBufferForCleanup(Buffer buffer);
extern void AbortBufferIO(void);
extern void BufmgrCommit(void);
extern void BufferSync(void);
extern void BgBufferSync(void);
extern void AtProcExit_LocalBuffers(void);