1996-07-09 08:22:35 +02:00
|
|
|
/*-------------------------------------------------------------------------
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|
|
*
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|
|
|
* localbuf.c--
|
1997-09-07 07:04:48 +02:00
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|
|
* local buffer manager. Fast buffer manager for temporary tables
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|
* or special cases when the operation is not visible to other backends.
|
1996-07-09 08:22:35 +02:00
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|
|
*
|
1997-09-07 07:04:48 +02:00
|
|
|
* When a relation is being created, the descriptor will have rd_islocal
|
|
|
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* set to indicate that the local buffer manager should be used. During
|
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|
|
* the same transaction the relation is being created, any inserts or
|
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|
|
* selects from the newly created relation will use the local buffer
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|
|
|
* pool. rd_islocal is reset at the end of a transaction (commit/abort).
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|
|
* This is useful for queries like SELECT INTO TABLE and create index.
|
1996-07-09 08:22:35 +02:00
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|
*
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* Copyright (c) 1994-5, Regents of the University of California
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*
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*
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|
|
* IDENTIFICATION
|
1997-10-12 09:12:03 +02:00
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|
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/localbuf.c,v 1.13 1997/10/12 07:12:03 vadim Exp $
|
1996-07-09 08:22:35 +02:00
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|
*
|
|
|
|
*-------------------------------------------------------------------------
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|
|
|
*/
|
1997-07-28 02:57:08 +02:00
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#include <sys/types.h>
|
1996-07-09 08:22:35 +02:00
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|
#include <sys/file.h>
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|
|
#include <stdio.h>
|
1996-11-08 07:02:30 +01:00
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|
|
#include <string.h>
|
1996-07-09 08:22:35 +02:00
|
|
|
#include <math.h>
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|
|
#include <signal.h>
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|
1996-11-03 05:57:03 +01:00
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|
|
#include "postgres.h"
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|
1996-07-09 08:22:35 +02:00
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|
|
/* declarations split between these three files */
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|
|
#include "storage/buf.h"
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|
|
#include "storage/buf_internals.h"
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|
|
#include "storage/bufmgr.h"
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|
|
#include "storage/fd.h"
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|
|
#include "storage/ipc.h"
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|
|
#include "storage/shmem.h"
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|
|
#include "storage/spin.h"
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|
|
#include "storage/smgr.h"
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|
|
|
#include "storage/lmgr.h"
|
1996-11-10 04:06:38 +01:00
|
|
|
#include "storage/buf_internals.h"
|
1996-07-09 08:22:35 +02:00
|
|
|
#include "miscadmin.h"
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|
|
#include "utils/builtins.h"
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|
|
#include "utils/hsearch.h"
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|
|
#include "utils/memutils.h"
|
1996-11-08 07:02:30 +01:00
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|
|
#include "utils/relcache.h"
|
1997-09-07 07:04:48 +02:00
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|
#include "executor/execdebug.h" /* for NDirectFileRead */
|
1996-07-09 08:22:35 +02:00
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|
#include "catalog/catalog.h"
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|
1997-04-18 04:53:37 +02:00
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|
|
extern long int LocalBufferFlushCount;
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|
1997-09-08 04:41:22 +02:00
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|
int NLocBuffer = 64;
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|
|
BufferDesc *LocalBufferDescriptors = NULL;
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|
|
long *LocalRefCount = NULL;
|
1996-07-09 08:22:35 +02:00
|
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|
|
1997-09-08 04:41:22 +02:00
|
|
|
static int nextFreeLocalBuf = 0;
|
1996-07-09 08:22:35 +02:00
|
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|
|
/*#define LBDEBUG*/
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|
|
/*
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|
|
|
* LocalBufferAlloc -
|
1997-09-07 07:04:48 +02:00
|
|
|
* allocate a local buffer. We do round robin allocation for now.
|
1996-07-09 08:22:35 +02:00
|
|
|
*/
|
1997-09-08 04:41:22 +02:00
|
|
|
BufferDesc *
|
1997-09-08 23:56:23 +02:00
|
|
|
LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
|
1996-07-09 08:22:35 +02:00
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
int i;
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|
|
BufferDesc *bufHdr = (BufferDesc *) NULL;
|
1996-07-09 08:22:35 +02:00
|
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|
|
1997-09-07 07:04:48 +02:00
|
|
|
if (blockNum == P_NEW)
|
|
|
|
{
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|
|
|
blockNum = reln->rd_nblocks;
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|
|
reln->rd_nblocks++;
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|
|
|
}
|
1996-07-09 08:22:35 +02:00
|
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|
1997-09-07 07:04:48 +02:00
|
|
|
/* a low tech search for now -- not optimized for scans */
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|
|
|
for (i = 0; i < NLocBuffer; i++)
|
|
|
|
{
|
|
|
|
if (LocalBufferDescriptors[i].tag.relId.relId == reln->rd_id &&
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|
|
|
LocalBufferDescriptors[i].tag.blockNum == blockNum)
|
|
|
|
{
|
1996-07-09 08:22:35 +02:00
|
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|
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|
|
|
#ifdef LBDEBUG
|
1997-09-07 07:04:48 +02:00
|
|
|
fprintf(stderr, "LB ALLOC (%d,%d) %d\n",
|
|
|
|
reln->rd_id, blockNum, -i - 1);
|
|
|
|
#endif
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|
|
|
LocalRefCount[i]++;
|
|
|
|
*foundPtr = TRUE;
|
|
|
|
return &LocalBufferDescriptors[i];
|
|
|
|
}
|
1996-07-09 08:22:35 +02:00
|
|
|
}
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|
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|
|
|
|
|
#ifdef LBDEBUG
|
1997-09-07 07:04:48 +02:00
|
|
|
fprintf(stderr, "LB ALLOC (%d,%d) %d\n",
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|
|
|
reln->rd_id, blockNum, -nextFreeLocalBuf - 1);
|
|
|
|
#endif
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|
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|
|
|
|
/* need to get a new buffer (round robin for now) */
|
|
|
|
for (i = 0; i < NLocBuffer; i++)
|
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
int b = (nextFreeLocalBuf + i) % NLocBuffer;
|
1997-09-07 07:04:48 +02:00
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|
|
if (LocalRefCount[b] == 0)
|
|
|
|
{
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|
|
|
bufHdr = &LocalBufferDescriptors[b];
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|
|
|
LocalRefCount[b]++;
|
|
|
|
nextFreeLocalBuf = (b + 1) % NLocBuffer;
|
|
|
|
break;
|
|
|
|
}
|
1996-07-09 08:22:35 +02:00
|
|
|
}
|
1997-09-07 07:04:48 +02:00
|
|
|
if (bufHdr == NULL)
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|
|
|
elog(WARN, "no empty local buffer.");
|
1996-07-09 08:22:35 +02:00
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|
|
|
1997-09-07 07:04:48 +02:00
|
|
|
/*
|
|
|
|
* this buffer is not referenced but it might still be dirty (the last
|
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|
|
* transaction to touch it doesn't need its contents but has not
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|
|
|
* flushed it). if that's the case, write it out before reusing it!
|
|
|
|
*/
|
|
|
|
if (bufHdr->flags & BM_DIRTY)
|
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
Relation bufrel = RelationIdCacheGetRelation(bufHdr->tag.relId.relId);
|
1997-09-07 07:04:48 +02:00
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|
|
Assert(bufrel != NULL);
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|
|
/* flush this page */
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|
smgrwrite(bufrel->rd_rel->relsmgr, bufrel, bufHdr->tag.blockNum,
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|
|
|
(char *) MAKE_PTR(bufHdr->data));
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|
|
LocalBufferFlushCount++;
|
1997-10-12 09:12:03 +02:00
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|
|
RelationDecrementReferenceCount(bufrel);
|
1997-09-07 07:04:48 +02:00
|
|
|
}
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|
|
/*
|
|
|
|
* it's all ours now.
|
|
|
|
*/
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|
bufHdr->tag.relId.relId = reln->rd_id;
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|
|
bufHdr->tag.blockNum = blockNum;
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|
|
bufHdr->flags &= ~BM_DIRTY;
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|
|
|
|
|
|
/*
|
|
|
|
* lazy memory allocation. (see MAKE_PTR for why we need to do
|
|
|
|
* MAKE_OFFSET.)
|
|
|
|
*/
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|
|
if (bufHdr->data == (SHMEM_OFFSET) 0)
|
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
char *data = (char *) malloc(BLCKSZ);
|
1997-09-07 07:04:48 +02:00
|
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|
bufHdr->data = MAKE_OFFSET(data);
|
|
|
|
}
|
|
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|
|
*foundPtr = FALSE;
|
|
|
|
return bufHdr;
|
1996-07-09 08:22:35 +02:00
|
|
|
}
|
|
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|
|
|
|
|
/*
|
|
|
|
* WriteLocalBuffer -
|
1997-09-07 07:04:48 +02:00
|
|
|
* writes out a local buffer
|
1996-07-09 08:22:35 +02:00
|
|
|
*/
|
|
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|
int
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|
WriteLocalBuffer(Buffer buffer, bool release)
|
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
int bufid;
|
1996-07-09 08:22:35 +02:00
|
|
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|
1997-09-07 07:04:48 +02:00
|
|
|
Assert(BufferIsLocal(buffer));
|
1996-07-09 08:22:35 +02:00
|
|
|
|
|
|
|
#ifdef LBDEBUG
|
1997-09-07 07:04:48 +02:00
|
|
|
fprintf(stderr, "LB WRITE %d\n", buffer);
|
|
|
|
#endif
|
1996-07-09 08:22:35 +02:00
|
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|
1997-09-07 07:04:48 +02:00
|
|
|
bufid = -(buffer + 1);
|
|
|
|
LocalBufferDescriptors[bufid].flags |= BM_DIRTY;
|
|
|
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|
|
if (release)
|
|
|
|
{
|
|
|
|
Assert(LocalRefCount[bufid] > 0);
|
|
|
|
LocalRefCount[bufid]--;
|
|
|
|
}
|
1996-07-09 08:22:35 +02:00
|
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|
1997-09-07 07:04:48 +02:00
|
|
|
return true;
|
1996-07-09 08:22:35 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* FlushLocalBuffer -
|
1997-09-07 07:04:48 +02:00
|
|
|
* flushes a local buffer
|
1996-07-09 08:22:35 +02:00
|
|
|
*/
|
|
|
|
int
|
1997-01-16 09:13:14 +01:00
|
|
|
FlushLocalBuffer(Buffer buffer, bool release)
|
1996-07-09 08:22:35 +02:00
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
int bufid;
|
|
|
|
Relation bufrel;
|
|
|
|
BufferDesc *bufHdr;
|
1996-07-09 08:22:35 +02:00
|
|
|
|
1997-09-07 07:04:48 +02:00
|
|
|
Assert(BufferIsLocal(buffer));
|
1996-07-09 08:22:35 +02:00
|
|
|
|
|
|
|
#ifdef LBDEBUG
|
1997-09-07 07:04:48 +02:00
|
|
|
fprintf(stderr, "LB FLUSH %d\n", buffer);
|
|
|
|
#endif
|
|
|
|
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|
|
|
bufid = -(buffer + 1);
|
|
|
|
bufHdr = &LocalBufferDescriptors[bufid];
|
|
|
|
bufHdr->flags &= ~BM_DIRTY;
|
|
|
|
bufrel = RelationIdCacheGetRelation(bufHdr->tag.relId.relId);
|
|
|
|
|
|
|
|
Assert(bufrel != NULL);
|
|
|
|
smgrflush(bufrel->rd_rel->relsmgr, bufrel, bufHdr->tag.blockNum,
|
|
|
|
(char *) MAKE_PTR(bufHdr->data));
|
|
|
|
LocalBufferFlushCount++;
|
1997-10-12 09:12:03 +02:00
|
|
|
RelationDecrementReferenceCount(bufrel);
|
|
|
|
|
1997-09-07 07:04:48 +02:00
|
|
|
Assert(LocalRefCount[bufid] > 0);
|
|
|
|
if (release)
|
|
|
|
LocalRefCount[bufid]--;
|
|
|
|
|
|
|
|
return true;
|
1996-07-09 08:22:35 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* InitLocalBuffer -
|
1997-09-07 07:04:48 +02:00
|
|
|
* init the local buffer cache. Since most queries (esp. multi-user ones)
|
|
|
|
* don't involve local buffers, we delay allocating memory for actual the
|
|
|
|
* buffer until we need it.
|
1996-07-09 08:22:35 +02:00
|
|
|
*/
|
|
|
|
void
|
1996-11-10 04:06:38 +01:00
|
|
|
InitLocalBuffer(void)
|
1996-07-09 08:22:35 +02:00
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
int i;
|
1996-07-09 08:22:35 +02:00
|
|
|
|
|
|
|
/*
|
1997-09-07 07:04:48 +02:00
|
|
|
* these aren't going away. I'm not gonna use palloc.
|
1996-07-09 08:22:35 +02:00
|
|
|
*/
|
1997-09-07 07:04:48 +02:00
|
|
|
LocalBufferDescriptors =
|
|
|
|
(BufferDesc *) malloc(sizeof(BufferDesc) * NLocBuffer);
|
1997-09-18 22:22:58 +02:00
|
|
|
MemSet(LocalBufferDescriptors, 0, sizeof(BufferDesc) * NLocBuffer);
|
1997-09-07 07:04:48 +02:00
|
|
|
nextFreeLocalBuf = 0;
|
|
|
|
|
|
|
|
for (i = 0; i < NLocBuffer; i++)
|
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
BufferDesc *buf = &LocalBufferDescriptors[i];
|
1997-09-07 07:04:48 +02:00
|
|
|
|
|
|
|
/*
|
|
|
|
* negative to indicate local buffer. This is tricky: shared
|
|
|
|
* buffers start with 0. We have to start with -2. (Note that the
|
|
|
|
* routine BufferDescriptorGetBuffer adds 1 to buf_id so our first
|
|
|
|
* buffer id is -1.)
|
|
|
|
*/
|
|
|
|
buf->buf_id = -i - 2;
|
|
|
|
}
|
1996-07-09 08:22:35 +02:00
|
|
|
|
1997-09-07 07:04:48 +02:00
|
|
|
LocalRefCount =
|
|
|
|
(long *) malloc(sizeof(long) * NLocBuffer);
|
1997-09-18 22:22:58 +02:00
|
|
|
MemSet(LocalRefCount, 0, sizeof(long) * NLocBuffer);
|
1996-07-09 08:22:35 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* LocalBufferSync -
|
1997-09-07 07:04:48 +02:00
|
|
|
* flush all dirty buffers in the local buffer cache. Since the buffer
|
|
|
|
* cache is only used for keeping relations visible during a transaction,
|
|
|
|
* we will not need these buffers again.
|
1996-07-09 08:22:35 +02:00
|
|
|
*/
|
|
|
|
void
|
1996-11-10 04:06:38 +01:00
|
|
|
LocalBufferSync(void)
|
1996-07-09 08:22:35 +02:00
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
int i;
|
1997-09-07 07:04:48 +02:00
|
|
|
|
|
|
|
for (i = 0; i < NLocBuffer; i++)
|
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
BufferDesc *buf = &LocalBufferDescriptors[i];
|
|
|
|
Relation bufrel;
|
1996-07-09 08:22:35 +02:00
|
|
|
|
1997-09-07 07:04:48 +02:00
|
|
|
if (buf->flags & BM_DIRTY)
|
|
|
|
{
|
1996-07-09 08:22:35 +02:00
|
|
|
#ifdef LBDEBUG
|
1997-09-07 07:04:48 +02:00
|
|
|
fprintf(stderr, "LB SYNC %d\n", -i - 1);
|
|
|
|
#endif
|
|
|
|
bufrel = RelationIdCacheGetRelation(buf->tag.relId.relId);
|
|
|
|
|
|
|
|
Assert(bufrel != NULL);
|
|
|
|
|
|
|
|
smgrwrite(bufrel->rd_rel->relsmgr, bufrel, buf->tag.blockNum,
|
|
|
|
(char *) MAKE_PTR(buf->data));
|
|
|
|
LocalBufferFlushCount++;
|
1997-10-12 09:12:03 +02:00
|
|
|
RelationDecrementReferenceCount(bufrel);
|
|
|
|
|
1997-09-07 07:04:48 +02:00
|
|
|
buf->tag.relId.relId = InvalidOid;
|
|
|
|
buf->flags &= ~BM_DIRTY;
|
|
|
|
}
|
1996-07-09 08:22:35 +02:00
|
|
|
}
|
|
|
|
|
1997-09-18 22:22:58 +02:00
|
|
|
MemSet(LocalRefCount, 0, sizeof(long) * NLocBuffer);
|
1997-09-07 07:04:48 +02:00
|
|
|
nextFreeLocalBuf = 0;
|
1996-07-09 08:22:35 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
1996-11-10 04:06:38 +01:00
|
|
|
ResetLocalBufferPool(void)
|
1996-07-09 08:22:35 +02:00
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
int i;
|
1996-07-09 08:22:35 +02:00
|
|
|
|
1997-09-07 07:04:48 +02:00
|
|
|
for (i = 0; i < NLocBuffer; i++)
|
|
|
|
{
|
1997-09-08 04:41:22 +02:00
|
|
|
BufferDesc *buf = &LocalBufferDescriptors[i];
|
1996-07-09 08:22:35 +02:00
|
|
|
|
1997-09-07 07:04:48 +02:00
|
|
|
buf->tag.relId.relId = InvalidOid;
|
|
|
|
buf->flags &= ~BM_DIRTY;
|
|
|
|
buf->buf_id = -i - 2;
|
|
|
|
}
|
1996-07-09 08:22:35 +02:00
|
|
|
|
1997-09-18 22:22:58 +02:00
|
|
|
MemSet(LocalRefCount, 0, sizeof(long) * NLocBuffer);
|
1997-09-07 07:04:48 +02:00
|
|
|
nextFreeLocalBuf = 0;
|
1996-07-09 08:22:35 +02:00
|
|
|
}
|