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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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5
src/backend/access/transam/clog.c
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@ -24,7 +24,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/access/transam/clog.c,v 1.31 2005/06/30 00:00:50 tgl Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/clog.c,v 1.32 2005/08/20 23:26:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -144,8 +144,7 @@ TransactionIdGetStatus(TransactionId xid)
/*
* Initialization of shared memory for CLOG
*/
int
Size
CLOGShmemSize(void)
{
return SimpleLruShmemSize();