| /* |
| * Copyright (c) 2017, 2018, Red Hat, 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 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_GC_EPSILON_COLLECTEDHEAP_HPP |
| #define SHARE_VM_GC_EPSILON_COLLECTEDHEAP_HPP |
| |
| #include "gc/shared/collectedHeap.hpp" |
| #include "gc/shared/softRefPolicy.hpp" |
| #include "gc/shared/space.hpp" |
| #include "services/memoryManager.hpp" |
| #include "gc/epsilon/epsilonCollectorPolicy.hpp" |
| #include "gc/epsilon/epsilonMonitoringSupport.hpp" |
| #include "gc/epsilon/epsilonBarrierSet.hpp" |
| #include "gc/epsilon/epsilon_globals.hpp" |
| |
| class EpsilonHeap : public CollectedHeap { |
| friend class VMStructs; |
| private: |
| EpsilonCollectorPolicy* _policy; |
| SoftRefPolicy _soft_ref_policy; |
| EpsilonMonitoringSupport* _monitoring_support; |
| MemoryPool* _pool; |
| GCMemoryManager _memory_manager; |
| ContiguousSpace* _space; |
| VirtualSpace _virtual_space; |
| size_t _max_tlab_size; |
| size_t _step_counter_update; |
| size_t _step_heap_print; |
| int64_t _decay_time_ns; |
| volatile size_t _last_counter_update; |
| volatile size_t _last_heap_print; |
| |
| public: |
| static EpsilonHeap* heap(); |
| |
| EpsilonHeap(EpsilonCollectorPolicy* p) : |
| _policy(p), |
| _memory_manager("Epsilon Heap", "") {}; |
| |
| virtual Name kind() const { |
| return CollectedHeap::Epsilon; |
| } |
| |
| virtual const char* name() const { |
| return "Epsilon"; |
| } |
| |
| virtual CollectorPolicy* collector_policy() const { |
| return _policy; |
| } |
| |
| virtual SoftRefPolicy* soft_ref_policy() { |
| return &_soft_ref_policy; |
| } |
| |
| virtual jint initialize(); |
| virtual void post_initialize(); |
| virtual void initialize_serviceability(); |
| |
| virtual GrowableArray<GCMemoryManager*> memory_managers(); |
| virtual GrowableArray<MemoryPool*> memory_pools(); |
| |
| virtual size_t max_capacity() const { return _virtual_space.reserved_size(); } |
| virtual size_t capacity() const { return _virtual_space.committed_size(); } |
| virtual size_t used() const { return _space->used(); } |
| |
| virtual bool is_in(const void* p) const { |
| return _space->is_in(p); |
| } |
| |
| virtual bool is_scavengable(oop obj) { |
| // No GC is going to happen, therefore no objects ever move. |
| return false; |
| } |
| |
| virtual bool is_maximal_no_gc() const { |
| // No GC is going to happen. Return "we are at max", when we are about to fail. |
| return used() == capacity(); |
| } |
| |
| // Allocation |
| HeapWord* allocate_work(size_t size); |
| virtual HeapWord* mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded); |
| virtual HeapWord* allocate_new_tlab(size_t min_size, |
| size_t requested_size, |
| size_t* actual_size); |
| |
| // TLAB allocation |
| virtual bool supports_tlab_allocation() const { return true; } |
| virtual size_t tlab_capacity(Thread* thr) const { return capacity(); } |
| virtual size_t tlab_used(Thread* thr) const { return used(); } |
| virtual size_t max_tlab_size() const { return _max_tlab_size; } |
| virtual size_t unsafe_max_tlab_alloc(Thread* thr) const; |
| |
| virtual void collect(GCCause::Cause cause); |
| virtual void do_full_collection(bool clear_all_soft_refs); |
| |
| // Heap walking support |
| virtual void safe_object_iterate(ObjectClosure* cl); |
| virtual void object_iterate(ObjectClosure* cl) { |
| safe_object_iterate(cl); |
| } |
| |
| // Object pinning support: every object is implicitly pinned |
| virtual bool supports_object_pinning() const { return true; } |
| virtual oop pin_object(JavaThread* thread, oop obj) { return obj; } |
| virtual void unpin_object(JavaThread* thread, oop obj) { } |
| |
| // No support for block parsing. |
| virtual HeapWord* block_start(const void* addr) const { return NULL; } |
| virtual size_t block_size(const HeapWord* addr) const { return 0; } |
| virtual bool block_is_obj(const HeapWord* addr) const { return false; } |
| |
| // No GC threads |
| virtual void print_gc_threads_on(outputStream* st) const {} |
| virtual void gc_threads_do(ThreadClosure* tc) const {} |
| |
| // No heap verification |
| virtual void prepare_for_verify() {} |
| virtual void verify(VerifyOption option) {} |
| |
| virtual jlong millis_since_last_gc() { |
| // Report time since the VM start |
| return os::elapsed_counter() / NANOSECS_PER_MILLISEC; |
| } |
| |
| virtual void print_on(outputStream* st) const; |
| virtual void print_tracing_info() const; |
| |
| private: |
| void print_heap_info(size_t used) const; |
| void print_metaspace_info() const; |
| |
| }; |
| |
| #endif // SHARE_VM_GC_EPSILON_COLLECTEDHEAP_HPP |