--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/services/memoryManager.hpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,256 @@
+/*
+ * Copyright (c) 2003, 2013, 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.
+ *
+ */
+
+#ifndef SHARE_VM_SERVICES_MEMORYMANAGER_HPP
+#define SHARE_VM_SERVICES_MEMORYMANAGER_HPP
+
+#include "memory/allocation.hpp"
+#include "runtime/timer.hpp"
+#include "services/memoryUsage.hpp"
+
+// A memory manager is responsible for managing one or more memory pools.
+// The garbage collector is one type of memory managers responsible
+// for reclaiming memory occupied by unreachable objects. A Java virtual
+// machine may have one or more memory managers. It may
+// add or remove memory managers during execution.
+// A memory pool can be managed by more than one memory managers.
+
+class MemoryPool;
+class GCMemoryManager;
+class OopClosure;
+
+class MemoryManager : public CHeapObj<mtInternal> {
+private:
+ enum {
+ max_num_pools = 10
+ };
+
+ MemoryPool* _pools[max_num_pools];
+ int _num_pools;
+
+protected:
+ volatile instanceOop _memory_mgr_obj;
+
+public:
+ MemoryManager();
+
+ int num_memory_pools() const { return _num_pools; }
+ MemoryPool* get_memory_pool(int index) {
+ assert(index >= 0 && index < _num_pools, "Invalid index");
+ return _pools[index];
+ }
+
+ void add_pool(MemoryPool* pool);
+
+ bool is_manager(instanceHandle mh) { return mh() == _memory_mgr_obj; }
+
+ virtual instanceOop get_memory_manager_instance(TRAPS);
+ virtual bool is_gc_memory_manager() { return false; }
+ virtual const char* name() = 0;
+
+ // GC support
+ void oops_do(OopClosure* f);
+
+ // Static factory methods to get a memory manager of a specific type
+ static MemoryManager* get_code_cache_memory_manager();
+ static MemoryManager* get_metaspace_memory_manager();
+ static GCMemoryManager* get_copy_memory_manager();
+ static GCMemoryManager* get_msc_memory_manager();
+ static GCMemoryManager* get_parnew_memory_manager();
+ static GCMemoryManager* get_cms_memory_manager();
+ static GCMemoryManager* get_psScavenge_memory_manager();
+ static GCMemoryManager* get_psMarkSweep_memory_manager();
+ static GCMemoryManager* get_g1YoungGen_memory_manager();
+ static GCMemoryManager* get_g1OldGen_memory_manager();
+};
+
+class CodeCacheMemoryManager : public MemoryManager {
+private:
+public:
+ CodeCacheMemoryManager() : MemoryManager() {}
+
+ const char* name() { return "CodeCacheManager"; }
+};
+
+class MetaspaceMemoryManager : public MemoryManager {
+public:
+ MetaspaceMemoryManager() : MemoryManager() {}
+
+ const char* name() { return "Metaspace Manager"; }
+};
+
+class GCStatInfo : public ResourceObj {
+private:
+ size_t _index;
+ jlong _start_time;
+ jlong _end_time;
+
+ // We keep memory usage of all memory pools
+ MemoryUsage* _before_gc_usage_array;
+ MemoryUsage* _after_gc_usage_array;
+ int _usage_array_size;
+
+ void set_gc_usage(int pool_index, MemoryUsage, bool before_gc);
+
+public:
+ GCStatInfo(int num_pools);
+ ~GCStatInfo();
+
+ size_t gc_index() { return _index; }
+ jlong start_time() { return _start_time; }
+ jlong end_time() { return _end_time; }
+ int usage_array_size() { return _usage_array_size; }
+ MemoryUsage before_gc_usage_for_pool(int pool_index) {
+ assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
+ return _before_gc_usage_array[pool_index];
+ }
+ MemoryUsage after_gc_usage_for_pool(int pool_index) {
+ assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
+ return _after_gc_usage_array[pool_index];
+ }
+
+ MemoryUsage* before_gc_usage_array() { return _before_gc_usage_array; }
+ MemoryUsage* after_gc_usage_array() { return _after_gc_usage_array; }
+
+ void set_index(size_t index) { _index = index; }
+ void set_start_time(jlong time) { _start_time = time; }
+ void set_end_time(jlong time) { _end_time = time; }
+ void set_before_gc_usage(int pool_index, MemoryUsage usage) {
+ assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
+ set_gc_usage(pool_index, usage, true /* before gc */);
+ }
+ void set_after_gc_usage(int pool_index, MemoryUsage usage) {
+ assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking");
+ set_gc_usage(pool_index, usage, false /* after gc */);
+ }
+
+ void clear();
+};
+
+class GCMemoryManager : public MemoryManager {
+private:
+ // TODO: We should unify the GCCounter and GCMemoryManager statistic
+ size_t _num_collections;
+ elapsedTimer _accumulated_timer;
+ elapsedTimer _gc_timer; // for measuring every GC duration
+ GCStatInfo* _last_gc_stat;
+ Mutex* _last_gc_lock;
+ GCStatInfo* _current_gc_stat;
+ int _num_gc_threads;
+ volatile bool _notification_enabled;
+public:
+ GCMemoryManager();
+ ~GCMemoryManager();
+
+ void initialize_gc_stat_info();
+
+ bool is_gc_memory_manager() { return true; }
+ jlong gc_time_ms() { return _accumulated_timer.milliseconds(); }
+ size_t gc_count() { return _num_collections; }
+ int num_gc_threads() { return _num_gc_threads; }
+ void set_num_gc_threads(int count) { _num_gc_threads = count; }
+
+ void gc_begin(bool recordGCBeginTime, bool recordPreGCUsage,
+ bool recordAccumulatedGCTime);
+ void gc_end(bool recordPostGCUsage, bool recordAccumulatedGCTime,
+ bool recordGCEndTime, bool countCollection, GCCause::Cause cause);
+
+ void reset_gc_stat() { _num_collections = 0; _accumulated_timer.reset(); }
+
+ // Copy out _last_gc_stat to the given destination, returning
+ // the collection count. Zero signifies no gc has taken place.
+ size_t get_last_gc_stat(GCStatInfo* dest);
+
+ void set_notification_enabled(bool enabled) { _notification_enabled = enabled; }
+ bool is_notification_enabled() { return _notification_enabled; }
+};
+
+// These subclasses of GCMemoryManager are defined to include
+// GC-specific information.
+// TODO: Add GC-specific information
+class CopyMemoryManager : public GCMemoryManager {
+private:
+public:
+ CopyMemoryManager() : GCMemoryManager() {}
+
+ const char* name() { return "Copy"; }
+};
+
+class MSCMemoryManager : public GCMemoryManager {
+private:
+public:
+ MSCMemoryManager() : GCMemoryManager() {}
+
+ const char* name() { return "MarkSweepCompact"; }
+};
+
+class ParNewMemoryManager : public GCMemoryManager {
+private:
+public:
+ ParNewMemoryManager() : GCMemoryManager() {}
+
+ const char* name() { return "ParNew"; }
+};
+
+class CMSMemoryManager : public GCMemoryManager {
+private:
+public:
+ CMSMemoryManager() : GCMemoryManager() {}
+
+ const char* name() { return "ConcurrentMarkSweep";}
+};
+
+class PSScavengeMemoryManager : public GCMemoryManager {
+private:
+public:
+ PSScavengeMemoryManager() : GCMemoryManager() {}
+
+ const char* name() { return "PS Scavenge"; }
+};
+
+class PSMarkSweepMemoryManager : public GCMemoryManager {
+private:
+public:
+ PSMarkSweepMemoryManager() : GCMemoryManager() {}
+
+ const char* name() { return "PS MarkSweep"; }
+};
+
+class G1YoungGenMemoryManager : public GCMemoryManager {
+private:
+public:
+ G1YoungGenMemoryManager() : GCMemoryManager() {}
+
+ const char* name() { return "G1 Young Generation"; }
+};
+
+class G1OldGenMemoryManager : public GCMemoryManager {
+private:
+public:
+ G1OldGenMemoryManager() : GCMemoryManager() {}
+
+ const char* name() { return "G1 Old Generation"; }
+};
+
+#endif // SHARE_VM_SERVICES_MEMORYMANAGER_HPP