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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
configure.in
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@ -1,5 +1,5 @@
dnl Process this file with autoconf to produce a configure script.
dnl $PostgreSQL: pgsql/configure.in,v 1.419 2005/08/17 20:20:10 tgl Exp $
dnl $PostgreSQL: pgsql/configure.in,v 1.420 2005/08/20 23:26:06 tgl Exp $
dnl
dnl Developers, please strive to achieve this order:
dnl
@ -1132,6 +1132,9 @@ fi
# Need a #define for the size of Datum (unsigned long)
AC_CHECK_SIZEOF([unsigned long])
# And one for the size of size_t (enables tweaks for > 32bit address space)
AC_CHECK_SIZEOF([size_t])
# Determine memory alignment requirements for the basic C data types.
PGAC_CHECK_ALIGNOF(short)