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hotspot/src/share/vm/services/memoryPool.cpp

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+/*
+ * Copyright 2003-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+# include "incls/_precompiled.incl"
+# include "incls/_memoryPool.cpp.incl"
+
+MemoryPool::MemoryPool(const char* name,
+                       PoolType type,
+                       size_t init_size,
+                       size_t max_size,
+                       bool support_usage_threshold,
+                       bool support_gc_threshold) {
+  _name = name;
+  _initial_size = init_size;
+  _max_size = max_size;
+  _memory_pool_obj = NULL;
+  _available_for_allocation = true;
+  _num_managers = 0;
+  _type = type;
+
+  // initialize the max and init size of collection usage
+  _after_gc_usage = MemoryUsage(_initial_size, 0, 0, _max_size);
+
+  _usage_sensor = NULL;
+  _gc_usage_sensor = NULL;
+  // usage threshold supports both high and low threshold
+  _usage_threshold = new ThresholdSupport(support_usage_threshold, support_usage_threshold);
+  // gc usage threshold supports only high threshold
+  _gc_usage_threshold = new ThresholdSupport(support_gc_threshold, support_gc_threshold);
+}
+
+void MemoryPool::add_manager(MemoryManager* mgr) {
+  assert(_num_managers < MemoryPool::max_num_managers, "_num_managers exceeds the max");
+  if (_num_managers < MemoryPool::max_num_managers) {
+    _managers[_num_managers] = mgr;
+    _num_managers++;
+  }
+}
+
+
+// Returns an instanceHandle of a MemoryPool object.
+// It creates a MemoryPool instance when the first time
+// this function is called.
+instanceOop MemoryPool::get_memory_pool_instance(TRAPS) {
+  // Must do an acquire so as to force ordering of subsequent
+  // loads from anything _memory_pool_obj points to or implies.
+  instanceOop pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj);
+  if (pool_obj == NULL) {
+    // It's ok for more than one thread to execute the code up to the locked region.
+    // Extra pool instances will just be gc'ed.
+    klassOop k = Management::sun_management_ManagementFactory_klass(CHECK_NULL);
+    instanceKlassHandle ik(THREAD, k);
+
+    Handle pool_name = java_lang_String::create_from_str(_name, CHECK_NULL);
+    jlong usage_threshold_value = (_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
+    jlong gc_usage_threshold_value = (_gc_usage_threshold->is_high_threshold_supported() ? 0 : -1L);
+
+    JavaValue result(T_OBJECT);
+    JavaCallArguments args;
+    args.push_oop(pool_name);           // Argument 1
+    args.push_int((int) is_heap());     // Argument 2
+
+    symbolHandle method_name = vmSymbolHandles::createMemoryPool_name();
+    symbolHandle signature = vmSymbolHandles::createMemoryPool_signature();
+
+    args.push_long(usage_threshold_value);    // Argument 3
+    args.push_long(gc_usage_threshold_value); // Argument 4
+
+    JavaCalls::call_static(&result,
+                           ik,
+                           method_name,
+                           signature,
+                           &args,
+                           CHECK_NULL);
+
+    instanceOop p = (instanceOop) result.get_jobject();
+    instanceHandle pool(THREAD, p);
+
+    {
+      // Get lock since another thread may have create the instance
+      MutexLocker ml(Management_lock);
+
+      // Check if another thread has created the pool.  We reload
+      // _memory_pool_obj here because some other thread may have
+      // initialized it while we were executing the code before the lock.
+      //
+      // The lock has done an acquire, so the load can't float above it,
+      // but we need to do a load_acquire as above.
+      pool_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_pool_obj);
+      if (pool_obj != NULL) {
+         return pool_obj;
+      }
+
+      // Get the address of the object we created via call_special.
+      pool_obj = pool();
+
+      // Use store barrier to make sure the memory accesses associated
+      // with creating the pool are visible before publishing its address.
+      // The unlock will publish the store to _memory_pool_obj because
+      // it does a release first.
+      OrderAccess::release_store_ptr(&_memory_pool_obj, pool_obj);
+    }
+  }
+
+  return pool_obj;
+}
+
+inline static size_t get_max_value(size_t val1, size_t val2) {
+    return (val1 > val2 ? val1 : val2);
+}
+
+void MemoryPool::record_peak_memory_usage() {
+  // Caller in JDK is responsible for synchronization -
+  // acquire the lock for this memory pool before calling VM
+  MemoryUsage usage = get_memory_usage();
+  size_t peak_used = get_max_value(usage.used(), _peak_usage.used());
+  size_t peak_committed = get_max_value(usage.committed(), _peak_usage.committed());
+  size_t peak_max_size = get_max_value(usage.max_size(), _peak_usage.max_size());
+
+  _peak_usage = MemoryUsage(initial_size(), peak_used, peak_committed, peak_max_size);
+}
+
+static void set_sensor_obj_at(SensorInfo** sensor_ptr, instanceHandle sh) {
+  assert(*sensor_ptr == NULL, "Should be called only once");
+  SensorInfo* sensor = new SensorInfo();
+  sensor->set_sensor(sh());
+  *sensor_ptr = sensor;
+}
+
+void MemoryPool::set_usage_sensor_obj(instanceHandle sh) {
+  set_sensor_obj_at(&_usage_sensor, sh);
+}
+
+void MemoryPool::set_gc_usage_sensor_obj(instanceHandle sh) {
+  set_sensor_obj_at(&_gc_usage_sensor, sh);
+}
+
+void MemoryPool::oops_do(OopClosure* f) {
+  f->do_oop((oop*) &_memory_pool_obj);
+  if (_usage_sensor != NULL) {
+    _usage_sensor->oops_do(f);
+  }
+  if (_gc_usage_sensor != NULL) {
+    _gc_usage_sensor->oops_do(f);
+  }
+}
+
+ContiguousSpacePool::ContiguousSpacePool(ContiguousSpace* space,
+                                         const char* name,
+                                         PoolType type,
+                                         size_t max_size,
+                                         bool support_usage_threshold) :
+  CollectedMemoryPool(name, type, space->capacity(), max_size,
+                      support_usage_threshold), _space(space) {
+}
+
+MemoryUsage ContiguousSpacePool::get_memory_usage() {
+  size_t maxSize   = (available_for_allocation() ? max_size() : 0);
+  size_t used      = used_in_bytes();
+  size_t committed = _space->capacity();
+
+  return MemoryUsage(initial_size(), used, committed, maxSize);
+}
+
+SurvivorContiguousSpacePool::SurvivorContiguousSpacePool(DefNewGeneration* gen,
+                                                         const char* name,
+                                                         PoolType type,
+                                                         size_t max_size,
+                                                         bool support_usage_threshold) :
+  CollectedMemoryPool(name, type, gen->from()->capacity(), max_size,
+                      support_usage_threshold), _gen(gen) {
+}
+
+MemoryUsage SurvivorContiguousSpacePool::get_memory_usage() {
+  size_t maxSize = (available_for_allocation() ? max_size() : 0);
+  size_t used    = used_in_bytes();
+  size_t committed = committed_in_bytes();
+
+  return MemoryUsage(initial_size(), used, committed, maxSize);
+}
+
+#ifndef SERIALGC
+CompactibleFreeListSpacePool::CompactibleFreeListSpacePool(CompactibleFreeListSpace* space,
+                                                           const char* name,
+                                                           PoolType type,
+                                                           size_t max_size,
+                                                           bool support_usage_threshold) :
+  CollectedMemoryPool(name, type, space->capacity(), max_size,
+                      support_usage_threshold), _space(space) {
+}
+
+MemoryUsage CompactibleFreeListSpacePool::get_memory_usage() {
+  size_t maxSize   = (available_for_allocation() ? max_size() : 0);
+  size_t used      = used_in_bytes();
+  size_t committed = _space->capacity();
+
+  return MemoryUsage(initial_size(), used, committed, maxSize);
+}
+#endif // SERIALGC
+
+GenerationPool::GenerationPool(Generation* gen,
+                               const char* name,
+                               PoolType type,
+                               bool support_usage_threshold) :
+  CollectedMemoryPool(name, type, gen->capacity(), gen->max_capacity(),
+                      support_usage_threshold), _gen(gen) {
+}
+
+MemoryUsage GenerationPool::get_memory_usage() {
+  size_t used      = used_in_bytes();
+  size_t committed = _gen->capacity();
+  size_t maxSize   = (available_for_allocation() ? max_size() : 0);
+
+  return MemoryUsage(initial_size(), used, committed, maxSize);
+}
+
+CodeHeapPool::CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold) :
+  MemoryPool(name, NonHeap, codeHeap->capacity(), codeHeap->max_capacity(),
+             support_usage_threshold, false), _codeHeap(codeHeap) {
+}
+
+MemoryUsage CodeHeapPool::get_memory_usage() {
+  size_t used      = used_in_bytes();
+  size_t committed = _codeHeap->capacity();
+  size_t maxSize   = (available_for_allocation() ? max_size() : 0);
+
+  return MemoryUsage(initial_size(), used, committed, maxSize);
+}