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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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4
src/include/storage/bufmgr.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.95 2005/08/12 05:05:51 tgl Exp $
* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.96 2005/08/20 23:26:33 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -140,7 +140,7 @@ extern void DropBuffers(Oid dbid);
#ifdef NOT_USED
extern void PrintPinnedBufs(void);
#endif
extern int BufferShmemSize(void);
extern Size BufferShmemSize(void);
extern RelFileNode BufferGetFileNode(Buffer buffer);
extern void SetBufferCommitInfoNeedsSave(Buffer buffer);