--- a/jdk/src/java.management/unix/native/libmanagement/LinuxOperatingSystem.c Thu May 07 20:50:57 2015 -0700
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,333 +0,0 @@
-/*
- * Copyright (c) 2011, 2013, 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 "sun_management_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_sun_management_OperatingSystemImpl_getSystemCpuLoad0
-(JNIEnv *env, jobject dummy)
-{
- if(perfInit() == 0) {
- return get_cpu_load(-1);
- } else {
- return -1.0;
- }
-}
-
-JNIEXPORT jdouble JNICALL
-Java_sun_management_OperatingSystemImpl_getProcessCpuLoad0
-(JNIEnv *env, jobject dummy)
-{
- if(perfInit() == 0) {
- return get_process_load();
- } else {
- return -1.0;
- }
-}