postgresql-11.1-AIX-SysV-SharedMemory-LargePagesV2.patch

--- ./src/backend/port/sysv_shmem.c.ORIGIN	2018-11-23 11:05:31 +0100
+++ ./src/backend/port/sysv_shmem.c	2018-11-23 11:16:04 +0100
@@ -63,9 +63,14 @@
  * developer use, this shouldn't be a big problem.  Because of this, we do
  * not worry about supporting anonymous shmem in the EXEC_BACKEND cases below.
  */
+#if !defined(_AIX)
 #ifndef EXEC_BACKEND
 #define USE_ANONYMOUS_SHMEM
 #endif
+// On AIX, 64K pages can be used only with SysV shared memory.
+// Not defining USE_ANONYMOUS_SHMEM on AIX leads to SysV shared memory.
+#endif
+
 
 
 typedef key_t IpcMemoryKey;		/* shared memory key passed to shmget(2) */
@@ -125,7 +130,13 @@
 	}
 #endif
 
-	shmid = shmget(memKey, size, IPC_CREAT | IPC_EXCL | IPCProtection);
+	shmid = shmget(memKey, size, IPC_CREAT | IPC_EXCL | IPCProtection
+#if !defined(_AIX)
+										);
+#else
+	// On AIX, SHM_LGPAGE & SHM_PIN are required in order to be able to use Large Pages
+									  | SHM_LGPAGE | SHM_PIN | S_IRUSR | S_IWUSR);
+#endif
 
 	if (shmid < 0)
 	{
@@ -155,7 +166,13 @@
 		 */
 		if (shmget_errno == EINVAL)
 		{
-			shmid = shmget(memKey, 0, IPC_CREAT | IPC_EXCL | IPCProtection);
+			shmid = shmget(memKey, 0, IPC_CREAT | IPC_EXCL | IPCProtection
+#if !defined(_AIX)
+											);
+#else
+	// On AIX, SHM_LGPAGE & SHM_PIN are required in order to be able to use Large Pages
+											| SHM_LGPAGE | SHM_PIN | S_IRUSR | S_IWUSR);
+#endif
 
 			if (shmid < 0)
 			{
--- ./src/include/storage/dsm_impl.h.ORIGIN	2018-11-23 11:33:45 +0100
+++ ./src/include/storage/dsm_impl.h	2018-11-23 11:34:40 +0100
@@ -30,7 +30,12 @@
 #else
 #ifdef HAVE_SHM_OPEN
 #define USE_DSM_POSIX
+#if !defined(_AIX)
 #define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE		DSM_IMPL_POSIX
+#else
+// On AIX, 64K pages can be used only with SysV shared memory
+#define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE		DSM_IMPL_SYSV
+#endif // AIX
 #endif
 #define USE_DSM_SYSV
 #ifndef DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE