Do not allocate shared memory for wal_redo process (#165)

* Do not allocate shared memory for wal_redo process * Add comment
neondatabase · May 10, 2024 · e92af9b · e92af9b
1 parent 01df03f
commit e92af9b
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/backend/port/sysv_shmem.c b/src/backend/port/sysv_shmem.c
@@ -155,6 +155,12 @@ InternalIpcMemoryCreate(IpcMemoryKey memKey, Size size)
 		}
 	}
 #endif
+	/*
+	 * NEON: do not create shared memory segments for single user wal redo postgres.
+	 * Many spawned instances of wal redo may exhaust kernel.shmmni
+	 */
+	if (am_wal_redo_postgres)
+		return valloc(size);
 
 	shmid = shmget(memKey, size, IPC_CREAT | IPC_EXCL | IPCProtection);