--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/jdk.management/linux/native/libmanagement_ext/UnixOperatingSystem.c Fri Apr 17 09:40:02 2015 +0200
@@ -0,0 +1,333 @@
+/*
+ * 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 <stdio.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/resource.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <pthread.h>
+#include <inttypes.h>
+#include "com_sun_management_internal_OperatingSystemImpl.h"
+
+struct ticks {
+ uint64_t used;
+ uint64_t usedKernel;
+ uint64_t total;
+};
+
+typedef struct ticks ticks;
+
+typedef enum {
+ CPU_LOAD_VM_ONLY,
+ CPU_LOAD_GLOBAL,
+} CpuLoadTarget;
+
+static struct perfbuf {
+ int nProcs;
+ ticks jvmTicks;
+ ticks cpuTicks;
+ ticks *cpus;
+} counters;
+
+#define DEC_64 "%"SCNd64
+
+static void next_line(FILE *f) {
+ while (fgetc(f) != '\n');
+}
+
+/**
+ * Return the total number of ticks since the system was booted.
+ * If the usedTicks parameter is not NULL, it will be filled with
+ * the number of ticks spent on actual processes (user, system or
+ * nice processes) since system boot. Note that this is the total number
+ * of "executed" ticks on _all_ CPU:s, that is on a n-way system it is
+ * n times the number of ticks that has passed in clock time.
+ *
+ * Returns a negative value if the reading of the ticks failed.
+ */
+static int get_totalticks(int which, ticks *pticks) {
+ FILE *fh;
+ uint64_t userTicks, niceTicks, systemTicks, idleTicks;
+ int n;
+
+ if((fh = fopen("/proc/stat", "r")) == NULL) {
+ return -1;
+ }
+
+ n = fscanf(fh, "cpu " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64,
+ &userTicks, &niceTicks, &systemTicks, &idleTicks);
+
+ // Move to next line
+ next_line(fh);
+
+ //find the line for requested cpu faster to just iterate linefeeds?
+ if (which != -1) {
+ int i;
+ for (i = 0; i < which; i++) {
+ if (fscanf(fh, "cpu%*d " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64, &userTicks, &niceTicks, &systemTicks, &idleTicks) != 4) {
+ fclose(fh);
+ return -2;
+ }
+ next_line(fh);
+ }
+ n = fscanf(fh, "cpu%*d " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64 "\n",
+ &userTicks, &niceTicks, &systemTicks, &idleTicks);
+ }
+
+ fclose(fh);
+ if (n != 4) {
+ return -2;
+ }
+
+ pticks->used = userTicks + niceTicks;
+ pticks->usedKernel = systemTicks;
+ pticks->total = userTicks + niceTicks + systemTicks + idleTicks;
+
+ return 0;
+}
+
+static int vread_statdata(const char *procfile, const char *fmt, va_list args) {
+ FILE *f;
+ int n;
+ char buf[2048];
+
+ if ((f = fopen(procfile, "r")) == NULL) {
+ return -1;
+ }
+
+ if ((n = fread(buf, 1, sizeof(buf), f)) != -1) {
+ char *tmp;
+
+ buf[n-1] = '\0';
+ /** skip through pid and exec name. the exec name _could be wacky_ (renamed) and
+ * make scanf go mupp.
+ */
+ if ((tmp = strrchr(buf, ')')) != NULL) {
+ // skip the ')' and the following space but check that the buffer is long enough
+ tmp += 2;
+ if (tmp < buf + n) {
+ n = vsscanf(tmp, fmt, args);
+ }
+ }
+ }
+
+ fclose(f);
+
+ return n;
+}
+
+static int read_statdata(const char *procfile, const char *fmt, ...) {
+ int n;
+ va_list args;
+
+ va_start(args, fmt);
+ n = vread_statdata(procfile, fmt, args);
+ va_end(args);
+ return n;
+}
+
+/** read user and system ticks from a named procfile, assumed to be in 'stat' format then. */
+static int read_ticks(const char *procfile, uint64_t *userTicks, uint64_t *systemTicks) {
+ return read_statdata(procfile, "%*c %*d %*d %*d %*d %*d %*u %*u %*u %*u %*u "DEC_64" "DEC_64,
+ userTicks, systemTicks
+ );
+}
+
+/**
+ * Return the number of ticks spent in any of the processes belonging
+ * to the JVM on any CPU.
+ */
+static int get_jvmticks(ticks *pticks) {
+ uint64_t userTicks;
+ uint64_t systemTicks;
+
+ if (read_ticks("/proc/self/stat", &userTicks, &systemTicks) < 0) {
+ return -1;
+ }
+
+ // get the total
+ if (get_totalticks(-1, pticks) < 0) {
+ return -1;
+ }
+
+ pticks->used = userTicks;
+ pticks->usedKernel = systemTicks;
+
+ return 0;
+}
+
+/**
+ * This method must be called first, before any data can be gathererd.
+ */
+int perfInit() {
+ static int initialized=1;
+
+ if (!initialized) {
+ int i;
+
+ int n = sysconf(_SC_NPROCESSORS_ONLN);
+ if (n <= 0) {
+ n = 1;
+ }
+
+ counters.cpus = calloc(n,sizeof(ticks));
+ if (counters.cpus != NULL) {
+ // For the CPU load
+ get_totalticks(-1, &counters.cpuTicks);
+
+ for (i = 0; i < n; i++) {
+ get_totalticks(i, &counters.cpus[i]);
+ }
+ // For JVM load
+ get_jvmticks(&counters.jvmTicks);
+ initialized = 1;
+ }
+ }
+
+ return initialized ? 0 : -1;
+}
+
+#define MAX(a,b) (a>b?a:b)
+#define MIN(a,b) (a<b?a:b)
+
+static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+
+/**
+ * Return the load of the CPU as a double. 1.0 means the CPU process uses all
+ * available time for user or system processes, 0.0 means the CPU uses all time
+ * being idle.
+ *
+ * Returns a negative value if there is a problem in determining the CPU load.
+ */
+
+static double get_cpuload_internal(int which, double *pkernelLoad, CpuLoadTarget target) {
+ uint64_t udiff, kdiff, tdiff;
+ ticks *pticks, tmp;
+ double user_load = -1.0;
+ int failed = 0;
+
+ *pkernelLoad = 0.0;
+
+ pthread_mutex_lock(&lock);
+
+ if(perfInit() == 0) {
+
+ if (target == CPU_LOAD_VM_ONLY) {
+ pticks = &counters.jvmTicks;
+ } else if (which == -1) {
+ pticks = &counters.cpuTicks;
+ } else {
+ pticks = &counters.cpus[which];
+ }
+
+ tmp = *pticks;
+
+ if (target == CPU_LOAD_VM_ONLY) {
+ if (get_jvmticks(pticks) != 0) {
+ failed = 1;
+ }
+ } else if (get_totalticks(which, pticks) < 0) {
+ failed = 1;
+ }
+
+ if(!failed) {
+ // seems like we sometimes end up with less kernel ticks when
+ // reading /proc/self/stat a second time, timing issue between cpus?
+ if (pticks->usedKernel < tmp.usedKernel) {
+ kdiff = 0;
+ } else {
+ kdiff = pticks->usedKernel - tmp.usedKernel;
+ }
+ tdiff = pticks->total - tmp.total;
+ udiff = pticks->used - tmp.used;
+
+ if (tdiff == 0) {
+ user_load = 0;
+ } else {
+ if (tdiff < (udiff + kdiff)) {
+ tdiff = udiff + kdiff;
+ }
+ *pkernelLoad = (kdiff / (double)tdiff);
+ // BUG9044876, normalize return values to sane values
+ *pkernelLoad = MAX(*pkernelLoad, 0.0);
+ *pkernelLoad = MIN(*pkernelLoad, 1.0);
+
+ user_load = (udiff / (double)tdiff);
+ user_load = MAX(user_load, 0.0);
+ user_load = MIN(user_load, 1.0);
+ }
+ }
+ }
+ pthread_mutex_unlock(&lock);
+ return user_load;
+}
+
+double get_cpu_load(int which) {
+ double u, s;
+ u = get_cpuload_internal(which, &s, CPU_LOAD_GLOBAL);
+ if (u < 0) {
+ return -1.0;
+ }
+ // Cap total systemload to 1.0
+ return MIN((u + s), 1.0);
+}
+
+double get_process_load() {
+ double u, s;
+ u = get_cpuload_internal(-1, &s, CPU_LOAD_VM_ONLY);
+ if (u < 0) {
+ return -1.0;
+ }
+ return u + s;
+}
+
+JNIEXPORT jdouble JNICALL
+Java_com_sun_management_internal_OperatingSystemImpl_getSystemCpuLoad0
+(JNIEnv *env, jobject dummy)
+{
+ if(perfInit() == 0) {
+ return get_cpu_load(-1);
+ } else {
+ return -1.0;
+ }
+}
+
+JNIEXPORT jdouble JNICALL
+Java_com_sun_management_internal_OperatingSystemImpl_getProcessCpuLoad0
+(JNIEnv *env, jobject dummy)
+{
+ if(perfInit() == 0) {
+ return get_process_load();
+ } else {
+ return -1.0;
+ }
+}