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Convert the arithmetic for shared memory size calculation from 'int'

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to 'Size' (that is, size_t), and install overflow detection checks in it.
This allows us to remove the former arbitrary restrictions on NBuffers
etc.  It won't make any difference in a 32-bit machine, but in a 64-bit
machine you could theoretically have terabytes of shared buffers.
(How efficiently we could manage 'em remains to be seen.)  Similarly,
num_temp_buffers, work_mem, and maintenance_work_mem can be set above
2Gb on a 64-bit machine.  Original patch from Koichi Suzuki, additional
work by moi.
This commit is contained in:
Tom Lane
2005-08-20 23:26:37 +00:00
parent 2299ceab1c
commit 0007490e09
50 changed files with 774 additions and 275 deletions
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6
src/include/storage/buf_internals.h
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@@ -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 1.78 2005/05/19 21:35:47 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.79 2005/08/20 23:26:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -182,11 +182,11 @@ extern long int LocalBufferFlushCount;
extern BufferDesc *StrategyGetBuffer(void);
extern void StrategyFreeBuffer(BufferDesc *buf, bool at_head);
extern int StrategySyncStart(void);
extern int StrategyShmemSize(void);
extern Size StrategyShmemSize(void);
extern void StrategyInitialize(bool init);
/* buf_table.c */
extern int BufTableShmemSize(int size);
extern Size BufTableShmemSize(int size);
extern void InitBufTable(int size);
extern int BufTableLookup(BufferTag *tagPtr);
extern int BufTableInsert(BufferTag *tagPtr, int buf_id);