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