| /* |
| * 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 "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 "%lld" |
| |
| 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; |
| uint64_t iowTicks = 0, irqTicks = 0, sirqTicks= 0; |
| int n; |
| |
| if((fh = fopen("/proc/stat", "r")) == NULL) { |
| return -1; |
| } |
| |
| n = fscanf(fh, "cpu " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64 " " |
| DEC_64 " " DEC_64, |
| &userTicks, &niceTicks, &systemTicks, &idleTicks, |
| &iowTicks, &irqTicks, &sirqTicks); |
| |
| // 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 " " |
| DEC_64 " " DEC_64 " " DEC_64, |
| &userTicks, &niceTicks, &systemTicks, &idleTicks, |
| &iowTicks, &irqTicks, &sirqTicks) < 4) { |
| fclose(fh); |
| return -2; |
| } |
| next_line(fh); |
| } |
| n = fscanf(fh, "cpu%*d " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64 " " |
| DEC_64 " " DEC_64 " " DEC_64 "\n", |
| &userTicks, &niceTicks, &systemTicks, &idleTicks, |
| &iowTicks, &irqTicks, &sirqTicks); |
| } |
| |
| fclose(fh); |
| if (n < 4) { |
| return -2; |
| } |
| |
| pticks->used = userTicks + niceTicks; |
| pticks->usedKernel = systemTicks + irqTicks + sirqTicks; |
| pticks->total = userTicks + niceTicks + systemTicks + idleTicks + |
| iowTicks + irqTicks + sirqTicks; |
| |
| 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_getSystemCpuLoad |
| (JNIEnv *env, jobject dummy) |
| { |
| if(perfInit() == 0) { |
| return get_cpu_load(-1); |
| } else { |
| return -1.0; |
| } |
| } |
| |
| JNIEXPORT jdouble JNICALL |
| Java_sun_management_OperatingSystemImpl_getProcessCpuLoad |
| (JNIEnv *env, jobject dummy) |
| { |
| if(perfInit() == 0) { |
| return get_process_load(); |
| } else { |
| return -1.0; |
| } |
| } |
