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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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18
src/backend/storage/buffer/localbuf.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.68 2005/08/08 19:44:22 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.69 2005/08/20 23:26:17 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -255,15 +255,13 @@ InitLocalBuffers(void)
int i;
/* Allocate and zero buffer headers and auxiliary arrays */
LocalBufferDescriptors = (BufferDesc *)
MemoryContextAllocZero(TopMemoryContext,
nbufs * sizeof(BufferDesc));
LocalBufferBlockPointers = (Block *)
MemoryContextAllocZero(TopMemoryContext,
nbufs * sizeof(Block));
LocalRefCount = (int32 *)
MemoryContextAllocZero(TopMemoryContext,
nbufs * sizeof(int32));
LocalBufferDescriptors = (BufferDesc *) calloc(nbufs, sizeof(BufferDesc));
LocalBufferBlockPointers = (Block *) calloc(nbufs, sizeof(Block));
LocalRefCount = (int32 *) calloc(nbufs, sizeof(int32));
if (!LocalBufferDescriptors || !LocalBufferBlockPointers || !LocalRefCount)
ereport(FATAL,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
nextFreeLocalBuf = 0;