src/jdk.management/linux/native/libmanagement_ext/UnixOperatingSystem.c
author jlaskey
Thu, 14 Nov 2019 12:50:08 -0400
branchJDK-8193209-branch
changeset 59088 da026c172c1e
parent 47216 71c04702a3d5
permissions -rw-r--r--
add missing files
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/*
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 * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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#include <stdio.h>
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#include <stdint.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/resource.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <dlfcn.h>
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#include <pthread.h>
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#include <inttypes.h>
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#include "com_sun_management_internal_OperatingSystemImpl.h"
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struct ticks {
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    uint64_t  used;
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    uint64_t  usedKernel;
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    uint64_t  total;
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};
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typedef struct ticks ticks;
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typedef enum {
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    CPU_LOAD_VM_ONLY,
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    CPU_LOAD_GLOBAL,
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} CpuLoadTarget;
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static struct perfbuf {
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    int   nProcs;
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    ticks jvmTicks;
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    ticks cpuTicks;
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    ticks *cpus;
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} counters;
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#define DEC_64 "%"SCNd64
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static void next_line(FILE *f) {
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    while (fgetc(f) != '\n');
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}
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/**
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 * Return the total number of ticks since the system was booted.
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 * If the usedTicks parameter is not NULL, it will be filled with
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 * the number of ticks spent on actual processes (user, system or
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 * nice processes) since system boot. Note that this is the total number
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 * of "executed" ticks on _all_ CPU:s, that is on a n-way system it is
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 * n times the number of ticks that has passed in clock time.
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 *
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 * Returns a negative value if the reading of the ticks failed.
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 */
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static int get_totalticks(int which, ticks *pticks) {
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    FILE         *fh;
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    uint64_t        userTicks, niceTicks, systemTicks, idleTicks;
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    uint64_t        iowTicks = 0, irqTicks = 0, sirqTicks= 0;
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    int             n;
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    if((fh = fopen("/proc/stat", "r")) == NULL) {
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        return -1;
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    }
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    n = fscanf(fh, "cpu " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64 " "
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                   DEC_64 " " DEC_64,
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           &userTicks, &niceTicks, &systemTicks, &idleTicks,
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           &iowTicks, &irqTicks, &sirqTicks);
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    // Move to next line
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    next_line(fh);
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    //find the line for requested cpu faster to just iterate linefeeds?
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    if (which != -1) {
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        int i;
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        for (i = 0; i < which; i++) {
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            if (fscanf(fh, "cpu%*d " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64 " "
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                            DEC_64 " " DEC_64 " " DEC_64,
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                   &userTicks, &niceTicks, &systemTicks, &idleTicks,
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                   &iowTicks, &irqTicks, &sirqTicks) < 4) {
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                fclose(fh);
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                return -2;
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            }
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            next_line(fh);
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        }
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        n = fscanf(fh, "cpu%*d " DEC_64 " " DEC_64 " " DEC_64 " " DEC_64 " "
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                       DEC_64 " " DEC_64 " " DEC_64 "\n",
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           &userTicks, &niceTicks, &systemTicks, &idleTicks,
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           &iowTicks, &irqTicks, &sirqTicks);
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    }
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    fclose(fh);
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    if (n < 4) {
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        return -2;
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    }
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    pticks->used       = userTicks + niceTicks;
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    pticks->usedKernel = systemTicks + irqTicks + sirqTicks;
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    pticks->total      = userTicks + niceTicks + systemTicks + idleTicks +
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                         iowTicks + irqTicks + sirqTicks;
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    return 0;
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}
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static int vread_statdata(const char *procfile, const char *fmt, va_list args) {
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    FILE    *f;
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    int     n;
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    char     buf[2048];
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    if ((f = fopen(procfile, "r")) == NULL) {
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        return -1;
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    }
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    if ((n = fread(buf, 1, sizeof(buf), f)) != -1) {
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    char *tmp;
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    buf[n-1] = '\0';
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    /** skip through pid and exec name. the exec name _could be wacky_ (renamed) and
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     *  make scanf go mupp.
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     */
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    if ((tmp = strrchr(buf, ')')) != NULL) {
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        // skip the ')' and the following space but check that the buffer is long enough
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        tmp += 2;
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        if (tmp < buf + n) {
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        n = vsscanf(tmp, fmt, args);
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        }
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    }
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    }
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    fclose(f);
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    return n;
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}
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static int read_statdata(const char *procfile, const char *fmt, ...) {
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    int       n;
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    va_list args;
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    va_start(args, fmt);
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    n = vread_statdata(procfile, fmt, args);
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    va_end(args);
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    return n;
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}
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/** read user and system ticks from a named procfile, assumed to be in 'stat' format then. */
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static int read_ticks(const char *procfile, uint64_t *userTicks, uint64_t *systemTicks) {
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    return read_statdata(procfile, "%*c %*d %*d %*d %*d %*d %*u %*u %*u %*u %*u "DEC_64" "DEC_64,
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             userTicks, systemTicks
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             );
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}
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/**
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 * Return the number of ticks spent in any of the processes belonging
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 * to the JVM on any CPU.
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 */
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static int get_jvmticks(ticks *pticks) {
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    uint64_t userTicks;
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    uint64_t systemTicks;
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    if (read_ticks("/proc/self/stat", &userTicks, &systemTicks) < 0) {
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        return -1;
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    }
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    // get the total
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    if (get_totalticks(-1, pticks) < 0) {
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        return -1;
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    }
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    pticks->used       = userTicks;
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    pticks->usedKernel = systemTicks;
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    return 0;
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}
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/**
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 * This method must be called first, before any data can be gathererd.
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 */
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int perfInit() {
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    static int initialized=1;
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    if (!initialized) {
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        int  i;
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        int n = sysconf(_SC_NPROCESSORS_ONLN);
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        if (n <= 0) {
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            n = 1;
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        }
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        counters.cpus = calloc(n,sizeof(ticks));
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        if (counters.cpus != NULL)  {
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            // For the CPU load
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            get_totalticks(-1, &counters.cpuTicks);
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            for (i = 0; i < n; i++) {
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                get_totalticks(i, &counters.cpus[i]);
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            }
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            // For JVM load
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            get_jvmticks(&counters.jvmTicks);
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            initialized = 1;
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        }
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    }
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    return initialized ? 0 : -1;
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}
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#define MAX(a,b) (a>b?a:b)
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#define MIN(a,b) (a<b?a:b)
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static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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/**
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 * Return the load of the CPU as a double. 1.0 means the CPU process uses all
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 * available time for user or system processes, 0.0 means the CPU uses all time
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 * being idle.
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 *
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 * Returns a negative value if there is a problem in determining the CPU load.
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 */
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static double get_cpuload_internal(int which, double *pkernelLoad, CpuLoadTarget target) {
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    uint64_t udiff, kdiff, tdiff;
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    ticks *pticks, tmp;
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    double user_load = -1.0;
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    int failed = 0;
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    *pkernelLoad = 0.0;
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    pthread_mutex_lock(&lock);
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    if(perfInit() == 0) {
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        if (target == CPU_LOAD_VM_ONLY) {
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            pticks = &counters.jvmTicks;
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        } else if (which == -1) {
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            pticks = &counters.cpuTicks;
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        } else {
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            pticks = &counters.cpus[which];
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        }
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        tmp = *pticks;
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        if (target == CPU_LOAD_VM_ONLY) {
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            if (get_jvmticks(pticks) != 0) {
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                failed = 1;
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            }
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        } else if (get_totalticks(which, pticks) < 0) {
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            failed = 1;
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        }
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        if(!failed) {
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            // seems like we sometimes end up with less kernel ticks when
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            // reading /proc/self/stat a second time, timing issue between cpus?
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            if (pticks->usedKernel < tmp.usedKernel) {
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                kdiff = 0;
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            } else {
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                kdiff = pticks->usedKernel - tmp.usedKernel;
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            }
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            tdiff = pticks->total - tmp.total;
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            udiff = pticks->used - tmp.used;
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            if (tdiff == 0) {
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                user_load = 0;
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            } else {
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                if (tdiff < (udiff + kdiff)) {
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                    tdiff = udiff + kdiff;
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                }
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                *pkernelLoad = (kdiff / (double)tdiff);
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                // BUG9044876, normalize return values to sane values
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                *pkernelLoad = MAX(*pkernelLoad, 0.0);
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                *pkernelLoad = MIN(*pkernelLoad, 1.0);
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                user_load = (udiff / (double)tdiff);
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                user_load = MAX(user_load, 0.0);
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                user_load = MIN(user_load, 1.0);
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            }
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        }
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    }
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    pthread_mutex_unlock(&lock);
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    return user_load;
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}
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double get_cpu_load(int which) {
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    double u, s;
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    u = get_cpuload_internal(which, &s, CPU_LOAD_GLOBAL);
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    if (u < 0) {
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        return -1.0;
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    }
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    // Cap total systemload to 1.0
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    return MIN((u + s), 1.0);
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}
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double get_process_load() {
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    double u, s;
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    u = get_cpuload_internal(-1, &s, CPU_LOAD_VM_ONLY);
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    if (u < 0) {
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        return -1.0;
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    }
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    return u + s;
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}
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JNIEXPORT jdouble JNICALL
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Java_com_sun_management_internal_OperatingSystemImpl_getSystemCpuLoad0
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(JNIEnv *env, jobject dummy)
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{
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    if(perfInit() == 0) {
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        return get_cpu_load(-1);
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    } else {
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        return -1.0;
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    }
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}
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JNIEXPORT jdouble JNICALL
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Java_com_sun_management_internal_OperatingSystemImpl_getProcessCpuLoad0
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(JNIEnv *env, jobject dummy)
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{
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    if(perfInit() == 0) {
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        return get_process_load();
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    } else {
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        return -1.0;
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    }
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}