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

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.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/include/storage/buf_internals.h b/src/include/storage/buf_internals.h
index 2bd210dfb52..6e083be21ba 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 1.78 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);