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src/hotspot/share/services/memoryPool.cpp

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  65   _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold);
  66   // gc usage threshold supports only high threshold
  67   _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold);
  68 }
  69 
  70 void MemoryPool::add_manager(MemoryManager* mgr) {
  71   assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max");
  72   if (_num_managers < MemoryPool::max_num_managers) {
  73     _managers[_num_managers] = mgr;
  74     _num_managers++;
  75   }
  76 }
  77 
  78 
  79 // Returns an instanceHandle of a MemoryPool object.
  80 // It creates a MemoryPool instance when the first time
  81 // this function is called.
  82 instanceOop MemoryPool::get_memory_pool_instance(TRAPS) {
  83   // Must do an acquire so as to force ordering of subsequent
  84   // loads from anything _memory_pool_obj points to or implies.
  85   instanceOop pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj);
  86   if (pool_obj == NULL) {
  87     // It's ok for more than one thread to execute the code up to the locked region.
  88     // Extra pool instances will just be gc'ed.
  89     InstanceKlass* ik = Management::sun_management_ManagementFactoryHelper_klass(CHECK_NULL);
  90 
  91     Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL);
  92     jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
  93     jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
  94 
  95     JavaValue result(T_OBJECT);
  96     JavaCallArguments args;
  97     args.push_oop(pool_name);           // Argument 1
  98     args.push_int((int) is_heap());     // Argument 2
  99 
 100     Symbol* method_name = vmSymbols::createMemoryPool_name();
 101     Symbol* signature = vmSymbols::createMemoryPool_signature();
 102 
 103     args.push_long(usage_threshold_value);    // Argument 3
 104     args.push_long(gc_usage_threshold_value); // Argument 4
 105 
 106     JavaCalls::call_static(&result,
 107                            ik,
 108                            method_name,
 109                            signature,
 110                            &args,
 111                            CHECK_NULL);
 112 
 113     instanceOop p = (instanceOop) result.get_jobject();
 114     instanceHandle pool(THREAD, p);
 115 
 116     {
 117       // Get lock since another thread may have create the instance
 118       MutexLocker ml(Management_lock);
 119 
 120       // Check if another thread has created the pool.  We reload
 121       // _memory_pool_obj here because some other thread may have
 122       // initialized it while we were executing the code before the lock.
 123       //
 124       // The lock has done an acquire, so the load can't float above it,
 125       // but we need to do a load_acquire as above.
 126       pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj);
 127       if (pool_obj != NULL) {
 128          return pool_obj;
 129       }
 130 
 131       // Get the address of the object we created via call_special.
 132       pool_obj = pool();
 133 
 134       // Use store barrier to make sure the memory accesses associated
 135       // with creating the pool are visible before publishing its address.
 136       // The unlock will publish the store to _memory_pool_obj because
 137       // it does a release first.
 138       OrderAccess::release_store_ptr(&_memory_pool_obj, pool_obj);
 139     }
 140   }
 141 
 142   return pool_obj;
 143 }
 144 
 145 inline static size_t get_max_value(size_t val1, size_t val2) {
 146     return (val1 > val2 ? val1 : val2);
 147 }
 148 
 149 void MemoryPool::record_peak_memory_usage() {
 150   // Caller in JDK is responsible for synchronization -
 151   // acquire the lock for this memory pool before calling VM
 152   MemoryUsage usage = get_memory_usage();
 153   size_t peak_used = get_max_value(usage.used(), _peak_usage.used());
 154   size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed());
 155   size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size());
 156 
 157   _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size);
 158 }




  65   _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold);
  66   // gc usage threshold supports only high threshold
  67   _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold);
  68 }
  69 
  70 void MemoryPool::add_manager(MemoryManager* mgr) {
  71   assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max");
  72   if (_num_managers < MemoryPool::max_num_managers) {
  73     _managers[_num_managers] = mgr;
  74     _num_managers++;
  75   }
  76 }
  77 
  78 
  79 // Returns an instanceHandle of a MemoryPool object.
  80 // It creates a MemoryPool instance when the first time
  81 // this function is called.
  82 instanceOop MemoryPool::get_memory_pool_instance(TRAPS) {
  83   // Must do an acquire so as to force ordering of subsequent
  84   // loads from anything _memory_pool_obj points to or implies.
  85   instanceOop pool_obj = OrderAccess::load_acquire(&_memory_pool_obj);
  86   if (pool_obj == NULL) {
  87     // It's ok for more than one thread to execute the code up to the locked region.
  88     // Extra pool instances will just be gc'ed.
  89     InstanceKlass* ik = Management::sun_management_ManagementFactoryHelper_klass(CHECK_NULL);
  90 
  91     Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL);
  92     jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
  93     jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
  94 
  95     JavaValue result(T_OBJECT);
  96     JavaCallArguments args;
  97     args.push_oop(pool_name);           // Argument 1
  98     args.push_int((int) is_heap());     // Argument 2
  99 
 100     Symbol* method_name = vmSymbols::createMemoryPool_name();
 101     Symbol* signature = vmSymbols::createMemoryPool_signature();
 102 
 103     args.push_long(usage_threshold_value);    // Argument 3
 104     args.push_long(gc_usage_threshold_value); // Argument 4
 105 
 106     JavaCalls::call_static(&result,
 107                            ik,
 108                            method_name,
 109                            signature,
 110                            &args,
 111                            CHECK_NULL);
 112 
 113     instanceOop p = (instanceOop) result.get_jobject();
 114     instanceHandle pool(THREAD, p);
 115 
 116     {
 117       // Get lock since another thread may have create the instance
 118       MutexLocker ml(Management_lock);
 119 
 120       // Check if another thread has created the pool.  We reload
 121       // _memory_pool_obj here because some other thread may have
 122       // initialized it while we were executing the code before the lock.
 123       //
 124       // The lock has done an acquire, so the load can't float above it,
 125       // but we need to do a load_acquire as above.
 126       pool_obj = OrderAccess::load_acquire(&_memory_pool_obj);
 127       if (pool_obj != NULL) {
 128          return pool_obj;
 129       }
 130 
 131       // Get the address of the object we created via call_special.
 132       pool_obj = pool();
 133 
 134       // Use store barrier to make sure the memory accesses associated
 135       // with creating the pool are visible before publishing its address.
 136       // The unlock will publish the store to _memory_pool_obj because
 137       // it does a release first.
 138       OrderAccess::release_store(&_memory_pool_obj, pool_obj);
 139     }
 140   }
 141 
 142   return pool_obj;
 143 }
 144 
 145 inline static size_t get_max_value(size_t val1, size_t val2) {
 146     return (val1 > val2 ? val1 : val2);
 147 }
 148 
 149 void MemoryPool::record_peak_memory_usage() {
 150   // Caller in JDK is responsible for synchronization -
 151   // acquire the lock for this memory pool before calling VM
 152   MemoryUsage usage = get_memory_usage();
 153   size_t peak_used = get_max_value(usage.used(), _peak_usage.used());
 154   size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed());
 155   size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size());
 156 
 157   _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size);
 158 }


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