|
|
|
|
@ -8,7 +8,7 @@ |
|
|
|
|
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group |
|
|
|
|
* Portions Copyright (c) 1994, Regents of the University of California |
|
|
|
|
* |
|
|
|
|
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.75 2004/12/31 22:03:42 pgsql Exp $ |
|
|
|
|
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.76 2005/02/03 23:29:19 tgl Exp $ |
|
|
|
|
* |
|
|
|
|
*------------------------------------------------------------------------- |
|
|
|
|
*/ |
|
|
|
|
@ -17,8 +17,9 @@ |
|
|
|
|
|
|
|
|
|
#include "storage/backendid.h" |
|
|
|
|
#include "storage/buf.h" |
|
|
|
|
#include "storage/lmgr.h" |
|
|
|
|
#include "storage/lwlock.h" |
|
|
|
|
#include "storage/shmem.h" |
|
|
|
|
#include "utils/rel.h" |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
@ -40,10 +41,10 @@ typedef bits16 BufFlags; |
|
|
|
|
* Buffer tag identifies which disk block the buffer contains. |
|
|
|
|
* |
|
|
|
|
* Note: the BufferTag data must be sufficient to determine where to write the |
|
|
|
|
* block, even during a "blind write" with no relcache entry. It's possible |
|
|
|
|
* that the backend flushing the buffer doesn't even believe the relation is |
|
|
|
|
* visible yet (its xact may have started before the xact that created the |
|
|
|
|
* rel). The storage manager must be able to cope anyway. |
|
|
|
|
* block, without reference to pg_class or pg_tablespace entries. It's |
|
|
|
|
* possible that the backend flushing the buffer doesn't even believe the |
|
|
|
|
* relation is visible yet (its xact may have started before the xact that |
|
|
|
|
* created the rel). The storage manager must be able to cope anyway. |
|
|
|
|
* |
|
|
|
|
* Note: if there's any pad bytes in the struct, INIT_BUFFERTAG will have |
|
|
|
|
* to be fixed to zero them, since this struct is used as a hash key. |
|
|
|
|
@ -107,58 +108,12 @@ typedef struct sbufdesc |
|
|
|
|
|
|
|
|
|
#define BufferDescriptorGetBuffer(bdesc) ((bdesc)->buf_id + 1) |
|
|
|
|
|
|
|
|
|
/* entry for buffer lookup hashtable */ |
|
|
|
|
typedef struct |
|
|
|
|
{ |
|
|
|
|
BufferTag key; /* Tag of a disk page */ |
|
|
|
|
int id; /* CDB id of associated CDB */ |
|
|
|
|
} BufferLookupEnt; |
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Definitions for the buffer replacement strategy |
|
|
|
|
*/ |
|
|
|
|
#define STRAT_LIST_UNUSED (-1) |
|
|
|
|
#define STRAT_LIST_B1 0 |
|
|
|
|
#define STRAT_LIST_T1 1 |
|
|
|
|
#define STRAT_LIST_T2 2 |
|
|
|
|
#define STRAT_LIST_B2 3 |
|
|
|
|
#define STRAT_NUM_LISTS 4 |
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* The Cache Directory Block (CDB) of the Adaptive Replacement Cache (ARC) |
|
|
|
|
*/ |
|
|
|
|
typedef struct |
|
|
|
|
{ |
|
|
|
|
int prev; /* list links */ |
|
|
|
|
int next; |
|
|
|
|
short list; /* ID of list it is currently in */ |
|
|
|
|
bool t1_vacuum; /* t => present only because of VACUUM */ |
|
|
|
|
TransactionId t1_xid; /* the xid this entry went onto T1 */ |
|
|
|
|
BufferTag buf_tag; /* page identifier */ |
|
|
|
|
int buf_id; /* currently assigned data buffer, or -1 */ |
|
|
|
|
} BufferStrategyCDB; |
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* The shared ARC control information. |
|
|
|
|
*/ |
|
|
|
|
typedef struct |
|
|
|
|
{ |
|
|
|
|
int target_T1_size; /* What T1 size are we aiming for */ |
|
|
|
|
int listUnusedCDB; /* All unused StrategyCDB */ |
|
|
|
|
int listHead[STRAT_NUM_LISTS]; /* ARC lists B1, T1, T2
|
|
|
|
|
* and B2 */ |
|
|
|
|
int listTail[STRAT_NUM_LISTS]; |
|
|
|
|
int listSize[STRAT_NUM_LISTS]; |
|
|
|
|
Buffer listFreeBuffers; /* List of unused buffers */ |
|
|
|
|
|
|
|
|
|
long num_lookup; /* Some hit statistics */ |
|
|
|
|
long num_hit[STRAT_NUM_LISTS]; |
|
|
|
|
time_t stat_report; |
|
|
|
|
|
|
|
|
|
/* Array of CDB's starts here */ |
|
|
|
|
BufferStrategyCDB cdb[1]; /* VARIABLE SIZE ARRAY */ |
|
|
|
|
} BufferStrategyControl; |
|
|
|
|
/* in bufmgr.c */ |
|
|
|
|
extern BufferDesc *BufferDescriptors; |
|
|
|
|
|
|
|
|
|
/* in localbuf.c */ |
|
|
|
|
extern BufferDesc *LocalBufferDescriptors; |
|
|
|
|
|
|
|
|
|
/* counters in buf_init.c */ |
|
|
|
|
extern long int ReadBufferCount; |
|
|
|
|
@ -170,11 +125,9 @@ extern long int LocalBufferFlushCount; |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Bufmgr Interface: |
|
|
|
|
* Internal routines: only called by bufmgr |
|
|
|
|
*/ |
|
|
|
|
|
|
|
|
|
/* Internal routines: only called by bufmgr */ |
|
|
|
|
|
|
|
|
|
/* freelist.c */ |
|
|
|
|
extern BufferDesc *StrategyBufferLookup(BufferTag *tagPtr, bool recheck, |
|
|
|
|
int *cdb_found_index); |
|
|
|
|
@ -185,20 +138,17 @@ extern void StrategyInvalidateBuffer(BufferDesc *buf); |
|
|
|
|
extern void StrategyHintVacuum(bool vacuum_active); |
|
|
|
|
extern int StrategyDirtyBufferList(BufferDesc **buffers, BufferTag *buftags, |
|
|
|
|
int max_buffers); |
|
|
|
|
extern int StrategyShmemSize(void); |
|
|
|
|
extern void StrategyInitialize(bool init); |
|
|
|
|
|
|
|
|
|
/* buf_table.c */ |
|
|
|
|
extern int BufTableShmemSize(int size); |
|
|
|
|
extern void InitBufTable(int size); |
|
|
|
|
extern int BufTableLookup(BufferTag *tagPtr); |
|
|
|
|
extern void BufTableInsert(BufferTag *tagPtr, int cdb_id); |
|
|
|
|
extern void BufTableInsert(BufferTag *tagPtr, int buf_id); |
|
|
|
|
extern void BufTableDelete(BufferTag *tagPtr); |
|
|
|
|
|
|
|
|
|
/* bufmgr.c */ |
|
|
|
|
extern BufferDesc *BufferDescriptors; |
|
|
|
|
|
|
|
|
|
/* localbuf.c */ |
|
|
|
|
extern BufferDesc *LocalBufferDescriptors; |
|
|
|
|
|
|
|
|
|
extern BufferDesc *LocalBufferAlloc(Relation reln, BlockNumber blockNum, |
|
|
|
|
bool *foundPtr); |
|
|
|
|
extern void WriteLocalBuffer(Buffer buffer, bool release); |
|
|
|
|
|
Tom Lane
21 years ago