diff options
Diffstat (limited to 'src/include/storage/buf_internals.h')
| -rw-r--r-- | src/include/storage/buf_internals.h | 80 |
1 files changed, 15 insertions, 65 deletions
diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h index a89999f38f4..00b0b8af48a 100644 --- a/src/include/storage/buf_internals.h +++ b/src/include/storage/buf_internals.h @@ -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 1.75.4.1 2005/02/03 23:30:12 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); |