1 /*
   2  * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 #include "precompiled.hpp"
  25 #include "services/memoryService.hpp"
  26 #include "gc_implementation/shared/generationCounters.hpp"
  27 #include "gc_implementation/epsilon/epsilonMonitoringSupport.hpp"
  28 #include "gc_implementation/epsilon/epsilonCollectedHeap.hpp"
  29 
  30 class EpsilonSpaceCounters: public CHeapObj<mtGC> {
  31   friend class VMStructs;
  32 
  33 private:
  34   PerfVariable* _capacity;
  35   PerfVariable* _used;
  36   char*         _name_space;
  37 
  38 public:
  39 
  40   EpsilonSpaceCounters(const char* name,
  41                  int ordinal,
  42                  size_t max_size,
  43                  size_t initial_capacity,
  44                  GenerationCounters* gc) {
  45 
  46     if (UsePerfData) {
  47       EXCEPTION_MARK;
  48       ResourceMark rm;
  49 
  50       const char* cns = PerfDataManager::name_space(gc->name_space(), "space", ordinal);
  51 
  52       _name_space = NEW_C_HEAP_ARRAY(char, strlen(cns)+1, mtGC);
  53       strcpy(_name_space, cns);
  54 
  55       const char* cname = PerfDataManager::counter_name(_name_space, "name");
  56       PerfDataManager::create_string_constant(SUN_GC, cname, name, CHECK);
  57 
  58       cname = PerfDataManager::counter_name(_name_space, "maxCapacity");
  59       PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes, (jlong)max_size, CHECK);
  60 
  61       cname = PerfDataManager::counter_name(_name_space, "capacity");
  62       _capacity = PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, initial_capacity, CHECK);
  63 
  64       cname = PerfDataManager::counter_name(_name_space, "used");
  65       _used = PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, (jlong) 0, CHECK);
  66 
  67       cname = PerfDataManager::counter_name(_name_space, "initCapacity");
  68       PerfDataManager::create_constant(SUN_GC, cname, PerfData::U_Bytes, initial_capacity, CHECK);
  69     }
  70   }
  71 
  72   ~EpsilonSpaceCounters() {
  73     if (_name_space != NULL) {
  74       FREE_C_HEAP_ARRAY(char, _name_space, mtGC);
  75     }
  76   }
  77 
  78   inline void update_all(size_t capacity, size_t used) {
  79     _capacity->set_value(capacity);
  80     _used->set_value(used);
  81   }
  82 };
  83 
  84 
  85 class EpsilonYoungGenerationCounters : public GenerationCounters {
  86 public:
  87   EpsilonYoungGenerationCounters() :
  88           GenerationCounters("Young", 0, 0, 0, (size_t)0, (size_t)0) {};
  89 
  90   virtual void update_all() {
  91     // no update
  92   }
  93 };
  94 
  95 class EpsilonGenerationCounters : public GenerationCounters {
  96 private:
  97   EpsilonCollectedHeap* _heap;
  98 public:
  99   EpsilonGenerationCounters(EpsilonCollectedHeap* heap) :
 100           GenerationCounters("Heap", 1, 1, 0, heap->max_capacity(), heap->capacity()),
 101           _heap(heap)
 102   {};
 103 
 104   virtual void update_all() {
 105     _current_size->set_value(_heap->capacity());
 106   }
 107 };
 108 
 109 EpsilonMonitoringSupport::EpsilonMonitoringSupport(EpsilonCollectedHeap* heap) {
 110   // We report young gen as unused.
 111   _young_counters = new EpsilonYoungGenerationCounters();
 112   _heap_counters  = new EpsilonGenerationCounters(heap);
 113   _space_counters = new EpsilonSpaceCounters("Heap", 0, heap->max_capacity(), 0, _heap_counters);
 114 }
 115 
 116 void EpsilonMonitoringSupport::update_counters() {
 117   MemoryService::track_memory_usage();
 118 
 119   if (UsePerfData) {
 120     EpsilonCollectedHeap* heap = EpsilonCollectedHeap::heap();
 121     size_t used = heap->used();
 122     size_t capacity = heap->capacity();
 123     _heap_counters->update_all();
 124     _space_counters->update_all(capacity, used);
 125     MetaspaceCounters::update_performance_counters();
 126     CompressedClassSpaceCounters::update_performance_counters();
 127   }
 128 }
 129