JDK-8030957 - AIX: Implement OperatingSystemMXBean.getSystemCpuLoad() and .getProcessCpuLoad() on AIX

src/jdk.management/aix/native/libmanagement_ext/UnixOperatingSystem.c

@@ -1,6 +1,6 @@
 /*
- * Copyright (c) 2008, 2022, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2015, 2020 SAP SE. All rights reserved.
+ * Copyright (c) 2008, 2025, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2025 SAP SE. 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
@@ -28,20 +28,114 @@
 /* Implement and update https://bugs.openjdk.org/browse/JDK-8030957 */
 
 #include <jni.h>
+#include <time.h>
+#include <stdlib.h>
+#include <libperfstat.h>
+#include <pthread.h>
 #include "com_sun_management_internal_OperatingSystemImpl.h"
+#define HTIC2SEC(x) (((double)(x) * XINTFRAC) / 1000000000.0)
+
+static struct perfMetrics{
+    unsigned long long timebase;
+    perfstat_process_t stats;
+    perfstat_cpu_total_t cpu_total;
+} counters;
+
+static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+
+int perfInit() {
+    static int initialized = 0;
+    if (!initialized) {
+
+        perfstat_id_t id;
+        counters.stats = (perfstat_process_t){0};
+        counters.timebase = 0;
+        int rc = perfstat_cpu_total(NULL, &counters.cpu_total, sizeof(perfstat_cpu_total_t), 1);
+        if (rc < 0) {
+            return -1;
+        }
+        rc = perfstat_process(&id, &counters.stats, sizeof(perfstat_process_t), 1);
+        if (rc < 0) {
+            return -1;
+        }
+        counters.timebase = counters.stats.last_timebase;
+        initialized = 1;
+    }
+    return initialized ? 0 : -1;
+}
 
 JNIEXPORT jdouble JNICALL
 Java_com_sun_management_internal_OperatingSystemImpl_getCpuLoad0
 (JNIEnv *env, jobject dummy)
 {
-    return -1.0;
+    double load = -1.0;
+    pthread_mutex_lock(&lock);
+    if (perfInit() == 0) {
+        int ret;
+        perfstat_cpu_total_t cpu_total;
+        ret = perfstat_cpu_total(NULL, &cpu_total, sizeof(perfstat_cpu_total_t), 1);
+        if (ret < 0) {
+            return -1.0;
+        }
+        long long user_diff = cpu_total.user - counters.cpu_total.user;
+        long long sys_diff = cpu_total.sys - counters.cpu_total.sys;
+        long long idle_diff = cpu_total.idle - counters.cpu_total.idle;
+        long long wait_diff = cpu_total.wait - counters.cpu_total.wait;
+        long long total = user_diff + sys_diff + idle_diff + wait_diff;
+        if (total < (user_diff + sys_diff)) {
+            total = user_diff + sys_diff;
+        }
+        if (total == 0) {
+            load = 0.0;
+        }
+        else {
+            load = (double)(user_diff + sys_diff) / total;
+            load = MAX(load, 0.0);
+            load = MIN(load, 1.0);
+        }
+        counters.cpu_total = cpu_total;
+    }
+    pthread_mutex_unlock(&lock);
+    return load;
 }
 
 JNIEXPORT jdouble JNICALL
 Java_com_sun_management_internal_OperatingSystemImpl_getProcessCpuLoad0
 (JNIEnv *env, jobject dummy)
 {
-    return -1.0;
+    perfstat_process_t curr_stats;
+    perfstat_id_t id;
+    unsigned long long curr_timebase, timebase_diff;
+    double user_diff, sys_diff, delta_time;
+    double cpu_load = -1.0;
+    pthread_mutex_lock(&lock);
+    if (perfInit() == 0) {
+        int ret;
+        ret = perfstat_process(&id, &curr_stats, sizeof(perfstat_process_t), 1);
+        if (ret < 0) {
+            return -1.0;
+        }
+        curr_timebase = curr_stats.last_timebase;
+        timebase_diff = curr_timebase - counters.timebase;
+        if ((long long)timebase_diff < 0 || XINTFRAC == 0) {
+            return -1.0;
+        }
+        delta_time = HTIC2SEC(timebase_diff);
+        user_diff = (double)(curr_stats.ucpu_time - counters.stats.ucpu_time);
+        sys_diff  = (double)(curr_stats.scpu_time - counters.stats.scpu_time);
+        counters.stats = curr_stats;
+        counters.timebase = curr_timebase;
+        if(delta_time == 0) {
+            cpu_load = 0.0;
+        }
+        else {
+            cpu_load = (user_diff + sys_diff) / delta_time;
+            cpu_load = MAX(cpu_load, 0.0);
+            cpu_load = MIN(cpu_load, 1.0);
+        }
+    }
+    pthread_mutex_unlock(&lock);
+    return (jdouble)cpu_load;
 }
 
 JNIEXPORT jdouble JNICALL

test/jdk/ProblemList.txt

@@ -554,8 +554,6 @@ java/io/IO/IO.java                                              8337935 linux-pp
 
 # jdk_management
 
-com/sun/management/OperatingSystemMXBean/GetProcessCpuLoad.java 8030957 aix-all
-com/sun/management/OperatingSystemMXBean/GetSystemCpuLoad.java  8030957 aix-all
 
 java/lang/management/MemoryMXBean/Pending.java                  8158837 generic-all
 java/lang/management/MemoryMXBean/PendingAllGC.sh               8158837 generic-all