/*
* Copyright (c) 2011, 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 "com_sun_management_UnixOperatingSystem.h"
#include <sys/time.h>
#include <mach/mach.h>
#include <mach/task_info.h>
JNIEXPORT jdouble JNICALL
Java_com_sun_management_UnixOperatingSystem_getSystemCpuLoad
(JNIEnv *env, jobject dummy)
{
// This code is influenced by the darwin top source
kern_return_t kr;
mach_msg_type_number_t count;
host_cpu_load_info_data_t load;
static jlong last_used = 0;
static jlong last_total = 0;
count = HOST_CPU_LOAD_INFO_COUNT;
kr = host_statistics(mach_host_self(), HOST_CPU_LOAD_INFO, (host_info_t)&load, &count);
if (kr != KERN_SUCCESS) {
return -1;
}
jlong used = load.cpu_ticks[CPU_STATE_USER] + load.cpu_ticks[CPU_STATE_NICE] + load.cpu_ticks[CPU_STATE_SYSTEM];
jlong total = used + load.cpu_ticks[CPU_STATE_IDLE];
if (last_used == 0 || last_total == 0) {
// First call, just set the last values
last_used = used;
last_total = total;
// return 0 since we have no data, not -1 which indicates error
return 0;
}
jlong used_delta = used - last_used;
jlong total_delta = total - last_total;
jdouble cpu = (jdouble) used_delta / total_delta;
last_used = used;
last_total = total;
return cpu;
}
#define TIME_VALUE_TO_TIMEVAL(a, r) do { \
(r)->tv_sec = (a)->seconds; \
(r)->tv_usec = (a)->microseconds; \
} while (0)
#define TIME_VALUE_TO_MICROSECONDS(TV) \
((TV).tv_sec * 1000 * 1000 + (TV).tv_usec)
JNIEXPORT jdouble JNICALL
Java_com_sun_management_UnixOperatingSystem_getProcessCpuLoad
(JNIEnv *env, jobject dummy)
{
// This code is influenced by the darwin top source
struct task_basic_info_64 task_info_data;
struct task_thread_times_info thread_info_data;
struct timeval user_timeval, system_timeval, task_timeval;
struct timeval now;
mach_port_t task = mach_task_self();
kern_return_t kr;
static jlong last_task_time = 0;
static jlong last_time = 0;
mach_msg_type_number_t thread_info_count = TASK_THREAD_TIMES_INFO_COUNT;
kr = task_info(task,
TASK_THREAD_TIMES_INFO,
(task_info_t)&thread_info_data,
&thread_info_count);
if (kr != KERN_SUCCESS) {
// Most likely cause: |task| is a zombie.
return -1;
}
mach_msg_type_number_t count = TASK_BASIC_INFO_64_COUNT;
kr = task_info(task,
TASK_BASIC_INFO_64,
(task_info_t)&task_info_data,
&count);
if (kr != KERN_SUCCESS) {
// Most likely cause: |task| is a zombie.
return -1;
}
/* Set total_time. */
// thread info contains live time...
TIME_VALUE_TO_TIMEVAL(&thread_info_data.user_time, &user_timeval);
TIME_VALUE_TO_TIMEVAL(&thread_info_data.system_time, &system_timeval);
timeradd(&user_timeval, &system_timeval, &task_timeval);
// ... task info contains terminated time.
TIME_VALUE_TO_TIMEVAL(&task_info_data.user_time, &user_timeval);
TIME_VALUE_TO_TIMEVAL(&task_info_data.system_time, &system_timeval);
timeradd(&user_timeval, &task_timeval, &task_timeval);
timeradd(&system_timeval, &task_timeval, &task_timeval);
if (gettimeofday(&now, NULL) < 0) {
return -1;
}
jint ncpus = JVM_ActiveProcessorCount();
jlong time = TIME_VALUE_TO_MICROSECONDS(now) * ncpus;
jlong task_time = TIME_VALUE_TO_MICROSECONDS(task_timeval);
if ((last_task_time == 0) || (last_time == 0)) {
// First call, just set the last values.
last_task_time = task_time;
last_time = time;
// return 0 since we have no data, not -1 which indicates error
return 0;
}
jlong task_time_delta = task_time - last_task_time;
jlong time_delta = time - last_time;
if (time_delta == 0) {
return -1;
}
jdouble cpu = (jdouble) task_time_delta / time_delta;
last_task_time = task_time;
last_time = time;
return cpu;
}