8324637: [aix] Implement support for reporting swap space in jdk.management

Backport-of: 33324a59ccdb220250cb74e15ce13af0e99dcb07

Author: MBaesken

src/jdk.management/unix/native/libmanagement_ext/OperatingSystemImpl.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2023, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2024, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -105,6 +105,12 @@ static jlong get_total_or_available_swap_space_size(JNIEnv* env, jboolean availa
         throw_internal_error(env, "sysctlbyname failed");
     }
     return available ? (jlong)vmusage.xsu_avail : (jlong)vmusage.xsu_total;
+#elif defined(_AIX)
+    perfstat_memory_total_t memory_info;
+    if (perfstat_memory_total(NULL, &memory_info, sizeof(perfstat_memory_total_t), 1) == -1) {
+        throw_internal_error(env, "perfstat_memory_total failed");
+    }
+    return available ? (jlong)(memory_info.pgsp_free * 4L * 1024L) : (jlong)(memory_info.pgsp_total * 4L * 1024L);
 #else /* _ALLBSD_SOURCE */
     /*
      * XXXBSD: there's no way available to get swap info in