jdk8-mips64-public/hotspot: src/os/linux/vm/os_perf_linux.cpp@0672fc1cf811 (annotated)

src/os/linux/vm/os_perf_linux.cpp@0672fc1cf811 (annotated)

src/os/linux/vm/os_perf_linux.cpp

Sat, 24 Oct 2020 14:55:37 +0800

author: aoqi
date: Sat, 24 Oct 2020 14:55:37 +0800
changeset 9933: 0672fc1cf811
parent 9858: b985cbb00e68
permissions: -rw-r--r--

#15190 MIPS port of 8243823: JFR Backport - vm_version_ext_mips.(h|c)pp support

 /*
  * Copyright (c) 2012, 2018, 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.
  *
  * 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 "precompiled.hpp"
 #include "jvm.h"
 #include "memory/allocation.inline.hpp"
 #include "os_linux.inline.hpp"
 #include "runtime/os.hpp"
 #include "runtime/os_perf.hpp"
 #ifdef TARGET_ARCH_aarch32
 # include "vm_version_ext_aarch32.hpp"
 #endif
 #ifdef TARGET_ARCH_x86
 # include "vm_version_ext_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "vm_version_ext_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "vm_version_ext_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "vm_version_ext_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "vm_version_ext_ppc.hpp"
 #endif
 #ifdef TARGET_ARCH_mips
 # include "vm_version_ext_mips.hpp"
 #endif
 #include <stdio.h>
 #include <stdarg.h>
 #include <unistd.h>
 #include <errno.h>
 #include <string.h>
 #include <sys/resource.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <dirent.h>
 #include <stdlib.h>
 #include <dlfcn.h>
 #include <pthread.h>
 #include <limits.h>
 #include <ifaddrs.h>
 #include <fcntl.h>
 /**
    /proc/[number]/stat
               Status information about the process.  This is used by ps(1).  It is defined in /usr/src/linux/fs/proc/array.c.
               The fields, in order, with their proper scanf(3) format specifiers, are:
 . pid %d The process id.
 . comm %s
                      The filename of the executable, in parentheses.  This is visible whether or not the executable is swapped out.
 . state %c
                      One  character  from  the  string "RSDZTW" where R is running, S is sleeping in an interruptible wait, D is waiting in uninterruptible disk
                      sleep, Z is zombie, T is traced or stopped (on a signal), and W is paging.
 . ppid %d
                      The PID of the parent.
 . pgrp %d
                      The process group ID of the process.
 . session %d
                      The session ID of the process.
 . tty_nr %d
                      The tty the process uses.
 . tpgid %d
                      The process group ID of the process which currently owns the tty that the process is connected to.
 . flags %lu
                      The flags of the process.  The math bit is decimal 4, and the traced bit is decimal 10.
 . minflt %lu
                      The number of minor faults the process has made which have not required loading a memory page from disk.
 . cminflt %lu
                      The number of minor faults that the process's waited-for children have made.
 . majflt %lu
                      The number of major faults the process has made which have required loading a memory page from disk.
 . cmajflt %lu
                      The number of major faults that the process's waited-for children have made.
 . utime %lu
                      The number of jiffies that this process has been scheduled in user mode.
 . stime %lu
                      The number of jiffies that this process has been scheduled in kernel mode.
 . cutime %ld
                      The number of jiffies that this process's waited-for children have been scheduled in user mode. (See also times(2).)
 . cstime %ld
                      The number of jiffies that this process' waited-for children have been scheduled in kernel mode.
 . priority %ld
                      The standard nice value, plus fifteen.  The value is never negative in the kernel.
 . nice %ld
                      The nice value ranges from 19 (nicest) to -19 (not nice to others).
 . 0 %ld  This value is hard coded to 0 as a placeholder for a removed field.
 . itrealvalue %ld
                      The time in jiffies before the next SIGALRM is sent to the process due to an interval timer.
 . starttime %lu
                      The time in jiffies the process started after system boot.
 . vsize %lu
                      Virtual memory size in bytes.
 . rss %ld
                      Resident Set Size: number of pages the process has in real memory, minus 3 for administrative purposes. This is just the pages which  count
                      towards text, data, or stack space.  This does not include pages which have not been demand-loaded in, or which are swapped out.
 . rlim %lu
                      Current limit in bytes on the rss of the process (usually 4294967295 on i386).
 . startcode %lu
                      The address above which program text can run.
 . endcode %lu
                      The address below which program text can run.
 . startstack %lu
                      The address of the start of the stack.
 . kstkesp %lu
                      The current value of esp (stack pointer), as found in the kernel stack page for the process.
 . kstkeip %lu
                      The current EIP (instruction pointer).
 . signal %lu
                      The bitmap of pending signals (usually 0).
 . blocked %lu
                      The bitmap of blocked signals (usually 0, 2 for shells).
 . sigignore %lu
                      The bitmap of ignored signals.
 . sigcatch %lu
                      The bitmap of catched signals.
 . wchan %lu
                      This  is the "channel" in which the process is waiting.  It is the address of a system call, and can be looked up in a namelist if you need
                      a textual name.  (If you have an up-to-date /etc/psdatabase, then try ps -l to see the WCHAN field in action.)
 . nswap %lu
                      Number of pages swapped - not maintained.
 . cnswap %lu
                      Cumulative nswap for child processes.
 . exit_signal %d
                      Signal to be sent to parent when we die.
 . processor %d
                      CPU number last executed on.
  ///// SSCANF FORMAT STRING. Copy and use.
 field:        1  2  3  4  5  6  7  8  9   10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38 39
 format:       %d %s %c %d %d %d %d %d %lu %lu %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld %lu %lu %ld %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %d %d
 */
 /**
  * For platforms that have them, when declaring
  * a printf-style function,
  *   formatSpec is the parameter number (starting at 1)
  *       that is the format argument ("%d pid %s")
  *   params is the parameter number where the actual args to
  *       the format starts. If the args are in a va_list, this
  *       should be 0.
  */
 #ifndef PRINTF_ARGS
 #  define PRINTF_ARGS(formatSpec,  params) ATTRIBUTE_PRINTF(formatSpec, params)
 #endif
 #ifndef SCANF_ARGS
 #  define SCANF_ARGS(formatSpec,   params) ATTRIBUTE_SCANF(formatSpec, params)
 #endif
 #ifndef _PRINTFMT_
 #  define _PRINTFMT_
 #endif
 #ifndef _SCANFMT_
 #  define _SCANFMT_
 #endif
 struct CPUPerfTicks {
   uint64_t  used;
   uint64_t  usedKernel;
   uint64_t  total;
 };
 typedef enum {
   CPU_LOAD_VM_ONLY,
   CPU_LOAD_GLOBAL,
 } CpuLoadTarget;
 enum {
   UNDETECTED,
   UNDETECTABLE,
   LINUX26_NPTL,
   BAREMETAL
 };
 struct CPUPerfCounters {
   int   nProcs;
   CPUPerfTicks jvmTicks;
   CPUPerfTicks* cpus;
 };
 static double get_cpu_load(int which_logical_cpu, CPUPerfCounters* counters, double* pkernelLoad, CpuLoadTarget target);
 /** reads /proc/<pid>/stat data, with some checks and some skips.
  *  Ensure that 'fmt' does _NOT_ contain the first two "%d %s"
  */
 static int SCANF_ARGS(2, 0) vread_statdata(const char* procfile, _SCANFMT_ 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. */
     if ((tmp = strrchr(buf, ')')) != NULL) {
       // skip the ')' and the following space
       // but check that buffer is long enough
       tmp += 2;
       if (tmp < buf + n) {
         n = vsscanf(tmp, fmt, args);
       }
     }
   }
   fclose(f);
   return n;
 }
 static int SCANF_ARGS(2, 3) read_statdata(const char* procfile, _SCANFMT_ const char* fmt, ...) {
   int   n;
   va_list args;
   va_start(args, fmt);
   n = vread_statdata(procfile, fmt, args);
   va_end(args);
   return n;
 }
 static FILE* open_statfile(void) {
   FILE *f;
   if ((f = fopen("/proc/stat", "r")) == NULL) {
     static int haveWarned = 0;
     if (!haveWarned) {
       haveWarned = 1;
     }
   }
   return f;
 }
 static void
 next_line(FILE *f) {
   int c;
   do {
     c = fgetc(f);
   } while (c != '\n' && c != EOF);
 }
 /**
  * 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 OSReturn get_total_ticks(int which_logical_cpu, CPUPerfTicks* pticks) {
   FILE*         fh;
   uint64_t      userTicks, niceTicks, systemTicks, idleTicks;
   uint64_t      iowTicks = 0, irqTicks = 0, sirqTicks= 0;
   int           logical_cpu = -1;
   const int     expected_assign_count = (-1 == which_logical_cpu) ? 4 : 5;
   int           n;
   if ((fh = open_statfile()) == NULL) {
     return OS_ERR;
   }
   if (-1 == which_logical_cpu) {
     n = fscanf(fh, "cpu " UINT64_FORMAT " " UINT64_FORMAT " " UINT64_FORMAT " "
             UINT64_FORMAT " " UINT64_FORMAT " " UINT64_FORMAT " " UINT64_FORMAT,
             &userTicks, &niceTicks, &systemTicks, &idleTicks,
             &iowTicks, &irqTicks, &sirqTicks);
   } else {
     // Move to next line
     next_line(fh);
     // find the line for requested cpu faster to just iterate linefeeds?
     for (int i = 0; i < which_logical_cpu; i++) {
       next_line(fh);
     }
     n = fscanf(fh, "cpu%u " UINT64_FORMAT " " UINT64_FORMAT " " UINT64_FORMAT " "
                UINT64_FORMAT " " UINT64_FORMAT " " UINT64_FORMAT " " UINT64_FORMAT,
                &logical_cpu, &userTicks, &niceTicks,
                &systemTicks, &idleTicks, &iowTicks, &irqTicks, &sirqTicks);
   }
   fclose(fh);
   if (n < expected_assign_count || logical_cpu != which_logical_cpu) {
 #ifdef DEBUG_LINUX_PROC_STAT
     vm_fprintf(stderr, "[stat] read failed");
 #endif
     return OS_ERR;
   }
 #ifdef DEBUG_LINUX_PROC_STAT
   vm_fprintf(stderr, "[stat] read "
           UINT64_FORMAT " " UINT64_FORMAT " " UINT64_FORMAT " " UINT64_FORMAT " "
           UINT64_FORMAT " " UINT64_FORMAT " " UINT64_FORMAT " \n",
           userTicks, niceTicks, systemTicks, idleTicks,
           iowTicks, irqTicks, sirqTicks);
 #endif
   pticks->used       = userTicks + niceTicks;
   pticks->usedKernel = systemTicks + irqTicks + sirqTicks;
   pticks->total      = userTicks + niceTicks + systemTicks + idleTicks +
                        iowTicks + irqTicks + sirqTicks;
   return OS_OK;
 }
 static int get_systemtype(void) {
   static int procEntriesType = UNDETECTED;
   DIR *taskDir;
   if (procEntriesType != UNDETECTED) {
     return procEntriesType;
   }
   // Check whether we have a task subdirectory
   if ((taskDir = opendir("/proc/self/task")) == NULL) {
     procEntriesType = UNDETECTABLE;
   } else {
     // The task subdirectory exists; we're on a Linux >= 2.6 system
     closedir(taskDir);
     procEntriesType = LINUX26_NPTL;
   }
   return procEntriesType;
 }
 /** 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 " UINT64_FORMAT " " UINT64_FORMAT,
     userTicks, systemTicks);
 }
 /**
  * Return the number of ticks spent in any of the processes belonging
  * to the JVM on any CPU.
  */
 static OSReturn get_jvm_ticks(CPUPerfTicks* pticks) {
   uint64_t userTicks;
   uint64_t systemTicks;
   if (get_systemtype() != LINUX26_NPTL) {
     return OS_ERR;
   }
   if (read_ticks("/proc/self/stat", &userTicks, &systemTicks) != 2) {
     return OS_ERR;
   }
   // get the total
   if (get_total_ticks(-1, pticks) != OS_OK) {
     return OS_ERR;
   }
   pticks->used       = userTicks;
   pticks->usedKernel = systemTicks;
   return OS_OK;
 }
 /**
  * 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_cpu_load(int which_logical_cpu, CPUPerfCounters* counters, double* pkernelLoad, CpuLoadTarget target) {
   uint64_t udiff, kdiff, tdiff;
   CPUPerfTicks* pticks;
   CPUPerfTicks  tmp;
   double user_load;
   *pkernelLoad = 0.0;
   if (target == CPU_LOAD_VM_ONLY) {
     pticks = &counters->jvmTicks;
   } else if (-1 == which_logical_cpu) {
     pticks = &counters->cpus[counters->nProcs];
   } else {
     pticks = &counters->cpus[which_logical_cpu];
   }
   tmp = *pticks;
   if (target == CPU_LOAD_VM_ONLY) {
     if (get_jvm_ticks(pticks) != OS_OK) {
       return -1.0;
     }
   } else if (get_total_ticks(which_logical_cpu, pticks) != OS_OK) {
     return -1.0;
   }
   // 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) {
     return 0.0;
   } else if (tdiff < (udiff + kdiff)) {
     tdiff = udiff + kdiff;
   }
   *pkernelLoad = (kdiff / (double)tdiff);
   // BUG9044876, normalize return values to sane values
   *pkernelLoad = MAX2<double>(*pkernelLoad, 0.0);
   *pkernelLoad = MIN2<double>(*pkernelLoad, 1.0);
   user_load = (udiff / (double)tdiff);
   user_load = MAX2<double>(user_load, 0.0);
   user_load = MIN2<double>(user_load, 1.0);
   return user_load;
 }
 static int SCANF_ARGS(1, 2) parse_stat(_SCANFMT_ const char* fmt, ...) {
   FILE *f;
   va_list args;
   va_start(args, fmt);
   if ((f = open_statfile()) == NULL) {
     va_end(args);
     return OS_ERR;
   }
   for (;;) {
     char line[80];
     if (fgets(line, sizeof(line), f) != NULL) {
       if (vsscanf(line, fmt, args) == 1) {
         fclose(f);
         va_end(args);
         return OS_OK;
       }
     } else {
         fclose(f);
         va_end(args);
         return OS_ERR;
     }
   }
 }
 static int get_noof_context_switches(uint64_t* switches) {
   return parse_stat("ctxt " UINT64_FORMAT "\n", switches);
 }
 /** returns boot time in _seconds_ since epoch */
 static int get_boot_time(uint64_t* time) {
   return parse_stat("btime " UINT64_FORMAT "\n", time);
 }
 static int perf_context_switch_rate(double* rate) {
   static pthread_mutex_t contextSwitchLock = PTHREAD_MUTEX_INITIALIZER;
   static uint64_t      lastTime;
   static uint64_t      lastSwitches;
   static double        lastRate;
   uint64_t lt = 0;
   int res = 0;
   if (lastTime == 0) {
     uint64_t tmp;
     if (get_boot_time(&tmp) < 0) {
       return OS_ERR;
     }
     lt = tmp * 1000;
   }
   res = OS_OK;
   pthread_mutex_lock(&contextSwitchLock);
   {
     uint64_t sw;
     s8 t, d;
     if (lastTime == 0) {
       lastTime = lt;
     }
     t = os::javaTimeMillis();
     d = t - lastTime;
     if (d == 0) {
       *rate = lastRate;
     } else if (!get_noof_context_switches(&sw)) {
       *rate      = ( (double)(sw - lastSwitches) / d ) * 1000;
       lastRate     = *rate;
       lastSwitches = sw;
       lastTime     = t;
     } else {
       *rate = 0;
       res   = OS_ERR;
     }
     if (*rate <= 0) {
       *rate = 0;
       lastRate = 0;
     }
   }
   pthread_mutex_unlock(&contextSwitchLock);
   return res;
 }
 class CPUPerformanceInterface::CPUPerformance : public CHeapObj<mtInternal> {
   friend class CPUPerformanceInterface;
  private:
   CPUPerfCounters _counters;
   int cpu_load(int which_logical_cpu, double* cpu_load);
   int context_switch_rate(double* rate);
   int cpu_load_total_process(double* cpu_load);
   int cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad);
  public:
   CPUPerformance();
   bool initialize();
   ~CPUPerformance();
 };
 CPUPerformanceInterface::CPUPerformance::CPUPerformance() {
   _counters.nProcs = os::active_processor_count();
   _counters.cpus = NULL;
 }
 bool CPUPerformanceInterface::CPUPerformance::initialize() {
   size_t tick_array_size = (_counters.nProcs +1) * sizeof(CPUPerfTicks);
   _counters.cpus = (CPUPerfTicks*)NEW_C_HEAP_ARRAY(char, tick_array_size, mtInternal);
   if (NULL == _counters.cpus) {
     return false;
   }
   memset(_counters.cpus, 0, tick_array_size);
   // For the CPU load total
   get_total_ticks(-1, &_counters.cpus[_counters.nProcs]);
   // For each CPU
   for (int i = 0; i < _counters.nProcs; i++) {
     get_total_ticks(i, &_counters.cpus[i]);
   }
   // For JVM load
   get_jvm_ticks(&_counters.jvmTicks);
   // initialize context switch system
   // the double is only for init
   double init_ctx_switch_rate;
   perf_context_switch_rate(&init_ctx_switch_rate);
   return true;
 }
 CPUPerformanceInterface::CPUPerformance::~CPUPerformance() {
   if (_counters.cpus != NULL) {
     FREE_C_HEAP_ARRAY(char, _counters.cpus, mtInternal);
   }
 }
 int CPUPerformanceInterface::CPUPerformance::cpu_load(int which_logical_cpu, double* cpu_load) {
   double u, s;
   u = get_cpu_load(which_logical_cpu, &_counters, &s, CPU_LOAD_GLOBAL);
   if (u < 0) {
     *cpu_load = 0.0;
     return OS_ERR;
   }
   // Cap total systemload to 1.0
   *cpu_load = MIN2<double>((u + s), 1.0);
   return OS_OK;
 }
 int CPUPerformanceInterface::CPUPerformance::cpu_load_total_process(double* cpu_load) {
   double u, s;
   u = get_cpu_load(-1, &_counters, &s, CPU_LOAD_VM_ONLY);
   if (u < 0) {
     *cpu_load = 0.0;
     return OS_ERR;
   }
   *cpu_load = u + s;
   return OS_OK;
 }
 int CPUPerformanceInterface::CPUPerformance::cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad) {
   double u, s, t;
   assert(pjvmUserLoad != NULL, "pjvmUserLoad not inited");
   assert(pjvmKernelLoad != NULL, "pjvmKernelLoad not inited");
   assert(psystemTotalLoad != NULL, "psystemTotalLoad not inited");
   u = get_cpu_load(-1, &_counters, &s, CPU_LOAD_VM_ONLY);
   if (u < 0) {
     *pjvmUserLoad = 0.0;
     *pjvmKernelLoad = 0.0;
     *psystemTotalLoad = 0.0;
     return OS_ERR;
   }
   cpu_load(-1, &t);
   // clamp at user+system and 1.0
   if (u + s > t) {
     t = MIN2<double>(u + s, 1.0);
   }
   *pjvmUserLoad = u;
   *pjvmKernelLoad = s;
   *psystemTotalLoad = t;
   return OS_OK;
 }
 int CPUPerformanceInterface::CPUPerformance::context_switch_rate(double* rate) {
   return perf_context_switch_rate(rate);
 }
 CPUPerformanceInterface::CPUPerformanceInterface() {
   _impl = NULL;
 }
 bool CPUPerformanceInterface::initialize() {
   _impl = new CPUPerformanceInterface::CPUPerformance();
   return NULL == _impl ? false : _impl->initialize();
 }
 CPUPerformanceInterface::~CPUPerformanceInterface() {
   if (_impl != NULL) {
     delete _impl;
   }
 }
 int CPUPerformanceInterface::cpu_load(int which_logical_cpu, double* cpu_load) const {
   return _impl->cpu_load(which_logical_cpu, cpu_load);
 }
 int CPUPerformanceInterface::cpu_load_total_process(double* cpu_load) const {
   return _impl->cpu_load_total_process(cpu_load);
 }
 int CPUPerformanceInterface::cpu_loads_process(double* pjvmUserLoad, double* pjvmKernelLoad, double* psystemTotalLoad) const {
   return _impl->cpu_loads_process(pjvmUserLoad, pjvmKernelLoad, psystemTotalLoad);
 }
 int CPUPerformanceInterface::context_switch_rate(double* rate) const {
   return _impl->context_switch_rate(rate);
 }
 class SystemProcessInterface::SystemProcesses : public CHeapObj<mtInternal> {
   friend class SystemProcessInterface;
  private:
   class ProcessIterator : public CHeapObj<mtInternal> {
     friend class SystemProcessInterface::SystemProcesses;
    private:
     DIR*           _dir;
     struct dirent* _entry;
     bool           _valid;
     char           _exeName[PATH_MAX];
     char           _exePath[PATH_MAX];
     ProcessIterator();
     ~ProcessIterator();
     bool initialize();
     bool is_valid() const { return _valid; }
     bool is_valid_entry(struct dirent* entry) const;
     bool is_dir(const char* name) const;
     int  fsize(const char* name, uint64_t& size) const;
     char* allocate_string(const char* str) const;
     void  get_exe_name();
     char* get_exe_path();
     char* get_cmdline();
     int current(SystemProcess* process_info);
     int next_process();
   };
   ProcessIterator* _iterator;
   SystemProcesses();
   bool initialize();
   ~SystemProcesses();
   //information about system processes
   int system_processes(SystemProcess** system_processes, int* no_of_sys_processes) const;
 };
 bool SystemProcessInterface::SystemProcesses::ProcessIterator::is_dir(const char* name) const {
   struct stat mystat;
   int ret_val = 0;
   ret_val = stat(name, &mystat);
   if (ret_val < 0) {
     return false;
   }
   ret_val = S_ISDIR(mystat.st_mode);
   return ret_val > 0;
 }
 int SystemProcessInterface::SystemProcesses::ProcessIterator::fsize(const char* name, uint64_t& size) const {
   assert(name != NULL, "name pointer is NULL!");
   size = 0;
   struct stat fbuf;
   if (stat(name, &fbuf) < 0) {
     return OS_ERR;
   }
   size = fbuf.st_size;
   return OS_OK;
 }
 // if it has a numeric name, is a directory and has a 'stat' file in it
 bool SystemProcessInterface::SystemProcesses::ProcessIterator::is_valid_entry(struct dirent* entry) const {
   char buffer[PATH_MAX];
   uint64_t size = 0;
   if (atoi(entry->d_name) != 0) {
     jio_snprintf(buffer, PATH_MAX, "/proc/%s", entry->d_name);
     buffer[PATH_MAX - 1] = '\0';
     if (is_dir(buffer)) {
       jio_snprintf(buffer, PATH_MAX, "/proc/%s/stat", entry->d_name);
       buffer[PATH_MAX - 1] = '\0';
       if (fsize(buffer, size) != OS_ERR) {
         return true;
       }
     }
   }
   return false;
 }
 // get exe-name from /proc/<pid>/stat
 void SystemProcessInterface::SystemProcesses::ProcessIterator::get_exe_name() {
   FILE* fp;
   char  buffer[PATH_MAX];
   jio_snprintf(buffer, PATH_MAX, "/proc/%s/stat", _entry->d_name);
   buffer[PATH_MAX - 1] = '\0';
   if ((fp = fopen(buffer, "r")) != NULL) {
     if (fgets(buffer, PATH_MAX, fp) != NULL) {
       char* start, *end;
       // exe-name is between the first pair of ( and )
       start = strchr(buffer, '(');
       if (start != NULL && start[1] != '\0') {
         start++;
         end = strrchr(start, ')');
         if (end != NULL) {
           size_t len;
           len = MIN2<size_t>(end - start, sizeof(_exeName) - 1);
           memcpy(_exeName, start, len);
           _exeName[len] = '\0';
         }
       }
     }
     fclose(fp);
   }
 }
 // get command line from /proc/<pid>/cmdline
 char* SystemProcessInterface::SystemProcesses::ProcessIterator::get_cmdline() {
   FILE* fp;
   char  buffer[PATH_MAX];
   char* cmdline = NULL;
   jio_snprintf(buffer, PATH_MAX, "/proc/%s/cmdline", _entry->d_name);
   buffer[PATH_MAX - 1] = '\0';
   if ((fp = fopen(buffer, "r")) != NULL) {
     size_t size = 0;
     char   dummy;
     // find out how long the file is (stat always returns 0)
     while (fread(&dummy, 1, 1, fp) == 1) {
       size++;
     }
     if (size > 0) {
       cmdline = NEW_C_HEAP_ARRAY(char, size + 1, mtInternal);
       if (cmdline != NULL) {
         cmdline[0] = '\0';
         if (fseek(fp, 0, SEEK_SET) == 0) {
           if (fread(cmdline, 1, size, fp) == size) {
             // the file has the arguments separated by '\0',
             // so we translate '\0' to ' '
             for (size_t i = 0; i < size; i++) {
               if (cmdline[i] == '\0') {
                 cmdline[i] = ' ';
               }
             }
             cmdline[size] = '\0';
           }
         }
       }
     }
     fclose(fp);
   }
   return cmdline;
 }
 // get full path to exe from /proc/<pid>/exe symlink
 char* SystemProcessInterface::SystemProcesses::ProcessIterator::get_exe_path() {
   char buffer[PATH_MAX];
   jio_snprintf(buffer, PATH_MAX, "/proc/%s/exe", _entry->d_name);
   buffer[PATH_MAX - 1] = '\0';
   return realpath(buffer, _exePath);
 }
 char* SystemProcessInterface::SystemProcesses::ProcessIterator::allocate_string(const char* str) const {
   if (str != NULL) {
     size_t len = strlen(str);
     char* tmp = NEW_C_HEAP_ARRAY(char, len+1, mtInternal);
     strncpy(tmp, str, len);
     tmp[len] = '\0';
     return tmp;
   }
   return NULL;
 }
 int SystemProcessInterface::SystemProcesses::ProcessIterator::current(SystemProcess* process_info) {
   if (!is_valid()) {
     return OS_ERR;
   }
   process_info->set_pid(atoi(_entry->d_name));
   get_exe_name();
   process_info->set_name(allocate_string(_exeName));
   if (get_exe_path() != NULL) {
      process_info->set_path(allocate_string(_exePath));
   }
   char* cmdline = NULL;
   cmdline = get_cmdline();
   if (cmdline != NULL) {
     process_info->set_command_line(allocate_string(cmdline));
     FREE_C_HEAP_ARRAY(char, cmdline, mtInternal);
   }
   return OS_OK;
 }
 int SystemProcessInterface::SystemProcesses::ProcessIterator::next_process() {
   if (!is_valid()) {
     return OS_ERR;
   }
   do {
     _entry = os::readdir(_dir);
     if (_entry == NULL) {
       // Error or reached end.  Could use errno to distinguish those cases.
       _valid = false;
       return OS_ERR;
     }
   } while(!is_valid_entry(_entry));
   _valid = true;
   return OS_OK;
 }
 SystemProcessInterface::SystemProcesses::ProcessIterator::ProcessIterator() {
   _dir = NULL;
   _entry = NULL;
   _valid = false;
 }
 bool SystemProcessInterface::SystemProcesses::ProcessIterator::initialize() {
   _dir = os::opendir("/proc");
   _entry = NULL;
   _valid = true;
   next_process();
   return true;
 }
 SystemProcessInterface::SystemProcesses::ProcessIterator::~ProcessIterator() {
   if (_dir != NULL) {
     os::closedir(_dir);
   }
 }
 SystemProcessInterface::SystemProcesses::SystemProcesses() {
   _iterator = NULL;
 }
 bool SystemProcessInterface::SystemProcesses::initialize() {
   _iterator = new SystemProcessInterface::SystemProcesses::ProcessIterator();
   return NULL == _iterator ? false : _iterator->initialize();
 }
 SystemProcessInterface::SystemProcesses::~SystemProcesses() {
   if (_iterator != NULL) {
     delete _iterator;
   }
 }
 int SystemProcessInterface::SystemProcesses::system_processes(SystemProcess** system_processes, int* no_of_sys_processes) const {
   assert(system_processes != NULL, "system_processes pointer is NULL!");
   assert(no_of_sys_processes != NULL, "system_processes counter pointers is NULL!");
   assert(_iterator != NULL, "iterator is NULL!");
   // initialize pointers
   *no_of_sys_processes = 0;
   *system_processes = NULL;
   while (_iterator->is_valid()) {
     SystemProcess* tmp = new SystemProcess();
     _iterator->current(tmp);
     //if already existing head
     if (*system_processes != NULL) {
       //move "first to second"
       tmp->set_next(*system_processes);
     }
     // new head
     *system_processes = tmp;
     // increment
     (*no_of_sys_processes)++;
     // step forward
     _iterator->next_process();
   }
   return OS_OK;
 }
 int SystemProcessInterface::system_processes(SystemProcess** system_procs, int* no_of_sys_processes) const {
   return _impl->system_processes(system_procs, no_of_sys_processes);
 }
 SystemProcessInterface::SystemProcessInterface() {
   _impl = NULL;
 }
 bool SystemProcessInterface::initialize() {
   _impl = new SystemProcessInterface::SystemProcesses();
   return NULL == _impl ? false : _impl->initialize();
 }
 SystemProcessInterface::~SystemProcessInterface() {
   if (_impl != NULL) {
     delete _impl;
   }
 }
 CPUInformationInterface::CPUInformationInterface() {
   _cpu_info = NULL;
 }
 bool CPUInformationInterface::initialize() {
   _cpu_info = new CPUInformation();
   if (NULL == _cpu_info) {
     return false;
   }
   _cpu_info->set_number_of_hardware_threads(VM_Version_Ext::number_of_threads());
   _cpu_info->set_number_of_cores(VM_Version_Ext::number_of_cores());
   _cpu_info->set_number_of_sockets(VM_Version_Ext::number_of_sockets());
   _cpu_info->set_cpu_name(VM_Version_Ext::cpu_name());
   _cpu_info->set_cpu_description(VM_Version_Ext::cpu_description());
   return true;
 }
 CPUInformationInterface::~CPUInformationInterface() {
   if (_cpu_info != NULL) {
     if (_cpu_info->cpu_name() != NULL) {
       const char* cpu_name = _cpu_info->cpu_name();
       FREE_C_HEAP_ARRAY(char, cpu_name, mtInternal);
       _cpu_info->set_cpu_name(NULL);
     }
     if (_cpu_info->cpu_description() != NULL) {
        const char* cpu_desc = _cpu_info->cpu_description();
        FREE_C_HEAP_ARRAY(char, cpu_desc, mtInternal);
       _cpu_info->set_cpu_description(NULL);
     }
     delete _cpu_info;
   }
 }
 int CPUInformationInterface::cpu_information(CPUInformation& cpu_info) {
   if (_cpu_info == NULL) {
     return OS_ERR;
   }
   cpu_info = *_cpu_info; // shallow copy assignment
   return OS_OK;
 }
 class NetworkPerformanceInterface::NetworkPerformance : public CHeapObj<mtInternal> {
   friend class NetworkPerformanceInterface;
  private:
   NetworkPerformance();
   NetworkPerformance(const NetworkPerformance& rhs); // no impl
   NetworkPerformance& operator=(const NetworkPerformance& rhs); // no impl
   bool initialize();
   ~NetworkPerformance();
   int64_t read_counter(const char* iface, const char* counter) const;
   int network_utilization(NetworkInterface** network_interfaces) const;
 };
 NetworkPerformanceInterface::NetworkPerformance::NetworkPerformance() {
 }
 bool NetworkPerformanceInterface::NetworkPerformance::initialize() {
   return true;
 }
 NetworkPerformanceInterface::NetworkPerformance::~NetworkPerformance() {
 }
 int64_t NetworkPerformanceInterface::NetworkPerformance::read_counter(const char* iface, const char* counter) const {
   char buf[128];
   snprintf(buf, sizeof(buf), "/sys/class/net/%s/statistics/%s", iface, counter);
   int fd = open(buf, O_RDONLY);
   if (fd == -1) {
     return -1;
   }
   ssize_t num_bytes = read(fd, buf, sizeof(buf));
   close(fd);
   if ((num_bytes == -1) || (num_bytes >= static_cast<ssize_t>(sizeof(buf))) || (num_bytes < 1)) {
     return -1;
   }
   buf[num_bytes] = '\0';
   int64_t value = strtoll(buf, NULL, 10);
   return value;
 }
 int NetworkPerformanceInterface::NetworkPerformance::network_utilization(NetworkInterface** network_interfaces) const
 {
   ifaddrs* addresses;
   ifaddrs* cur_address;
   if (getifaddrs(&addresses) != 0) {
     return OS_ERR;
   }
   NetworkInterface* ret = NULL;
   for (cur_address = addresses; cur_address != NULL; cur_address = cur_address->ifa_next) {
     if ((cur_address->ifa_addr == NULL) || (cur_address->ifa_addr->sa_family != AF_PACKET)) {
       continue;
     }
     int64_t bytes_in = read_counter(cur_address->ifa_name, "rx_bytes");
     int64_t bytes_out = read_counter(cur_address->ifa_name, "tx_bytes");
     NetworkInterface* cur = new NetworkInterface(cur_address->ifa_name, bytes_in, bytes_out, ret);
     ret = cur;
   }
   freeifaddrs(addresses);
   *network_interfaces = ret;
   return OS_OK;
 }
 NetworkPerformanceInterface::NetworkPerformanceInterface() {
   _impl = NULL;
 }
 NetworkPerformanceInterface::~NetworkPerformanceInterface() {
   if (_impl != NULL) {
     delete _impl;
   }
 }
 bool NetworkPerformanceInterface::initialize() {
   _impl = new NetworkPerformanceInterface::NetworkPerformance();
   return _impl != NULL && _impl->initialize();
 }
 int NetworkPerformanceInterface::network_utilization(NetworkInterface** network_interfaces) const {
   return _impl->network_utilization(network_interfaces);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/os/linux/vm/os_perf_linux.cpp@0672fc1cf811 (annotated)

src/os/linux/vm/os_perf_linux.cpp