--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.management/solaris/native/libmanagement_ext/UnixOperatingSystem.c Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,241 @@
+/*
+ * Copyright (c) 2011, 2015, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include <fcntl.h>
+#include <kstat.h>
+#include <procfs.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/sysinfo.h>
+#include <sys/lwp.h>
+#include <pthread.h>
+#include <utmpx.h>
+#include <dlfcn.h>
+#include <sys/loadavg.h>
+#include <jni.h>
+#include "jvm.h"
+#include "com_sun_management_internal_OperatingSystemImpl.h"
+
+typedef struct {
+ kstat_t *kstat;
+ uint64_t last_idle;
+ uint64_t last_total;
+ double last_ratio;
+} cpuload_t;
+
+static cpuload_t *cpu_loads = NULL;
+static unsigned int num_cpus;
+static kstat_ctl_t *kstat_ctrl = NULL;
+
+static void map_cpu_kstat_counters() {
+ kstat_t *kstat;
+ int i;
+
+ // Get number of CPU(s)
+ if ((num_cpus = sysconf(_SC_NPROCESSORS_ONLN)) == -1) {
+ num_cpus = 1;
+ }
+
+ // Data structure for saving CPU load
+ if ((cpu_loads = calloc(num_cpus,sizeof(cpuload_t))) == NULL) {
+ return;
+ }
+
+ // Get kstat cpu_stat counters for every CPU
+ // (loop over kstat to find our cpu_stat(s)
+ i = 0;
+ for (kstat = kstat_ctrl->kc_chain; kstat != NULL; kstat = kstat->ks_next) {
+ if (strncmp(kstat->ks_module, "cpu_stat", 8) == 0) {
+
+ if (kstat_read(kstat_ctrl, kstat, NULL) == -1) {
+ // Failed to initialize kstat for this CPU so ignore it
+ continue;
+ }
+
+ if (i == num_cpus) {
+ // Found more cpu_stats than reported CPUs
+ break;
+ }
+
+ cpu_loads[i++].kstat = kstat;
+ }
+ }
+}
+
+static int init_cpu_kstat_counters() {
+ static int initialized = 0;
+
+ // Concurrence in this method is prevented by the lock in
+ // the calling method get_cpu_load();
+ if(!initialized) {
+ if ((kstat_ctrl = kstat_open()) != NULL) {
+ map_cpu_kstat_counters();
+ initialized = 1;
+ }
+ }
+ return initialized ? 0 : -1;
+}
+
+static void update_cpu_kstat_counters() {
+ if(kstat_chain_update(kstat_ctrl) != 0) {
+ free(cpu_loads);
+ map_cpu_kstat_counters();
+ }
+}
+
+int read_cpustat(cpuload_t *load, cpu_stat_t *cpu_stat) {
+ if (load->kstat == NULL) {
+ // no handle.
+ return -1;
+ }
+ if (kstat_read(kstat_ctrl, load->kstat, cpu_stat) == -1) {
+ // disabling for now, a kstat chain update is likely to happen next time
+ load->kstat = NULL;
+ return -1;
+ }
+ return 0;
+}
+
+double get_single_cpu_load(unsigned int n) {
+ cpuload_t *load;
+ cpu_stat_t cpu_stat;
+ uint_t *usage;
+ uint64_t c_idle;
+ uint64_t c_total;
+ uint64_t d_idle;
+ uint64_t d_total;
+ int i;
+
+ if (n >= num_cpus) {
+ return -1.0;
+ }
+
+ load = &cpu_loads[n];
+ if (read_cpustat(load, &cpu_stat) < 0) {
+ return -1.0;
+ }
+
+ usage = cpu_stat.cpu_sysinfo.cpu;
+ c_idle = usage[CPU_IDLE];
+
+ for (c_total = 0, i = 0; i < CPU_STATES; i++) {
+ c_total += usage[i];
+ }
+
+ // Calculate diff against previous snapshot
+ d_idle = c_idle - load->last_idle;
+ d_total = c_total - load->last_total;
+
+ /** update if weve moved */
+ if (d_total > 0) {
+ // Save current values for next time around
+ load->last_idle = c_idle;
+ load->last_total = c_total;
+ load->last_ratio = (double) (d_total - d_idle) / d_total;
+ }
+
+ return load->last_ratio;
+}
+
+int get_info(const char *path, void *info, size_t s, off_t o) {
+ int fd;
+ int ret = 0;
+ if ((fd = open(path, O_RDONLY)) < 0) {
+ return -1;
+ }
+ if (pread(fd, info, s, o) != s) {
+ ret = -1;
+ }
+ close(fd);
+ return ret;
+}
+
+#define MIN(a, b) ((a < b) ? a : b)
+
+static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+
+/**
+ * Return the cpu load (0-1) for proc number 'which' (or average all if which == -1)
+ */
+double get_cpu_load(int which) {
+ double load =.0;
+
+ pthread_mutex_lock(&lock);
+ if(init_cpu_kstat_counters()==0) {
+
+ update_cpu_kstat_counters();
+
+ if (which == -1) {
+ unsigned int i;
+ double t;
+
+ for (t = .0, i = 0; i < num_cpus; i++) {
+ t += get_single_cpu_load(i);
+ }
+
+ // Cap total systemload to 1.0
+ load = MIN((t / num_cpus), 1.0);
+ } else {
+ load = MIN(get_single_cpu_load(which), 1.0);
+ }
+ } else {
+ load = -1.0;
+ }
+ pthread_mutex_unlock(&lock);
+
+ return load;
+}
+
+/**
+ * Return the cpu load (0-1) for the current process (i.e the JVM)
+ * or -1.0 if the get_info() call failed
+ */
+double get_process_load(void) {
+ psinfo_t info;
+
+ // Get the percentage of "recent cpu usage" from all the lwp:s in the JVM:s
+ // process. This is returned as a value between 0.0 and 1.0 multiplied by 0x8000.
+ if (get_info("/proc/self/psinfo",&info.pr_pctcpu, sizeof(info.pr_pctcpu), offsetof(psinfo_t, pr_pctcpu)) == 0) {
+ return (double) info.pr_pctcpu / 0x8000;
+ }
+ return -1.0;
+}
+
+JNIEXPORT jdouble JNICALL
+Java_com_sun_management_internal_OperatingSystemImpl_getSystemCpuLoad0
+(JNIEnv *env, jobject dummy)
+{
+ return get_cpu_load(-1);
+}
+
+JNIEXPORT jdouble JNICALL
+Java_com_sun_management_internal_OperatingSystemImpl_getProcessCpuLoad0
+(JNIEnv *env, jobject dummy)
+{
+ return get_process_load();
+}
+