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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/lmgr/proc.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.162 2005/08/08 03:11:55 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/proc.c,v 1.163 2005/08/20 23:26:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -91,15 +91,19 @@ static bool CheckStatementTimeout(void);
/*
* Report shared-memory space needed by InitProcGlobal.
*/
int
Size
ProcGlobalShmemSize(void)
{
int size = 0;
Size size = 0;
size += MAXALIGN(sizeof(PROC_HDR)); /* ProcGlobal */
size += MAXALIGN(NUM_DUMMY_PROCS * sizeof(PGPROC)); /* DummyProcs */
size += MAXALIGN(MaxBackends * sizeof(PGPROC)); /* MyProcs */
size += MAXALIGN(sizeof(slock_t)); /* ProcStructLock */
/* ProcGlobal */
size = add_size(size, sizeof(PROC_HDR));
/* DummyProcs */
size = add_size(size, mul_size(NUM_DUMMY_PROCS, sizeof(PGPROC)));
/* MyProcs */
size = add_size(size, mul_size(MaxBackends, sizeof(PGPROC)));
/* ProcStructLock */
size = add_size(size, sizeof(slock_t));
return size;
}