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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/backend/storage/buffer/buf_table.c
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@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_table.c,v 1.41 2005/05/29 04:23:04 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_table.c,v 1.42 2005/08/20 23:26:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -37,7 +37,7 @@ static HTAB *SharedBufHash;
* Estimate space needed for mapping hashtable
* size is the desired hash table size (possibly more than NBuffers)
*/
int
Size
BufTableShmemSize(int size)
{
return hash_estimate_size(size, sizeof(BufferLookupEnt));