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Replace the BufMgrLock with separate locks on the lookup hashtable and

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the freelist, plus per-buffer spinlocks that protect access to individual
shared buffer headers.  This requires abandoning a global freelist (since
the freelist is a global contention point), which shoots down ARC and 2Q
as well as plain LRU management.  Adopt a clock sweep algorithm instead.
Preliminary results show substantial improvement in multi-backend situations.
This commit is contained in:
Tom Lane
2005-03-04 20:21:07 +00:00
parent 5592a6cf46
commit 5d5087363d
18 changed files with 1410 additions and 1932 deletions
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18
src/include/storage/bufmgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.89 2004/12/31 22:03:42 pgsql Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.90 2005/03/04 20:21:07 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -27,21 +27,25 @@ 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 Block *BufferBlockPointers;
extern int32 *PrivateRefCount;
extern DLLIMPORT int32 *PrivateRefCount;
/* in localbuf.c */
extern DLLIMPORT int NLocBuffer;
extern DLLIMPORT Block *LocalBufferBlockPointers;
extern int32 *LocalRefCount;
extern DLLIMPORT int32 *LocalRefCount;
/* special block number for ReadBuffer() */
#define P_NEW InvalidBlockNumber /* grow the file to get a new page */
/*
* Buffer context lock modes
* Buffer content lock modes (mode argument for LockBuffer())
*/
#define BUFFER_LOCK_UNLOCK 0
#define BUFFER_LOCK_SHARE 1
@@ -150,8 +154,12 @@ extern void LockBufferForCleanup(Buffer buffer);
extern void AbortBufferIO(void);
extern void BufmgrCommit(void);
extern int BufferSync(int percent, int maxpages);
extern void BufferSync(void);
extern void BgBufferSync(void);
extern void InitLocalBuffer(void);
/* in freelist.c */
extern void StrategyHintVacuum(bool vacuum_active);
#endif