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Add shared_memory_type GUC.

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Since 9.3 we have used anonymous shared mmap for our main shared memory
region, except in EXEC_BACKEND builds.  Provide a GUC so that users
can opt for System V shared memory once again, like in 9.2 and earlier.

A later patch proposes to add huge/large page support for AIX, which
requires System V shared memory and provided the motivation to revive
this possibility.  It may also be useful on some BSDs.

Author: Andres Freund (revived and documented by Thomas Munro)
Discussion: https://postgr.es/m/HE1PR0202MB28126DB4E0B6621CC6A1A91286D90%40HE1PR0202MB2812.eurprd02.prod.outlook.com
Discussion: https://postgr.es/m/2AE143D2-87D3-4AD1-AC78-CE2258230C05%40FreeBSD.org
This commit is contained in:
Thomas Munro
2019-02-03 09:55:39 +01:00
parent 0d1fe9f74e
commit f1bebef60e
7 changed files with 101 additions and 33 deletions
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2
src/backend/storage/ipc/ipci.c
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@ -46,6 +46,8 @@
#include "storage/spin.h"
#include "utils/snapmgr.h"
/* GUCs */
int shared_memory_type = DEFAULT_SHARED_MEMORY_TYPE;
shmem_startup_hook_type shmem_startup_hook = NULL;