author | kvn |
Thu, 27 May 2010 18:01:56 -0700 | |
changeset 5694 | 1e0532a6abff |
parent 5343 | 95a5c4b89273 |
child 5547 | f4b087cbb361 |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2001-2010 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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class AdjoiningGenerations; |
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class GCTaskManager; |
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class PSAdaptiveSizePolicy; |
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class GenerationSizer; |
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class CollectorPolicy; |
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class ParallelScavengeHeap : public CollectedHeap { |
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friend class VMStructs; |
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private: |
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static PSYoungGen* _young_gen; |
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static PSOldGen* _old_gen; |
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static PSPermGen* _perm_gen; |
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// Sizing policy for entire heap |
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static PSAdaptiveSizePolicy* _size_policy; |
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static PSGCAdaptivePolicyCounters* _gc_policy_counters; |
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static ParallelScavengeHeap* _psh; |
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size_t _perm_gen_alignment; |
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size_t _young_gen_alignment; |
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size_t _old_gen_alignment; |
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GenerationSizer* _collector_policy; |
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inline size_t set_alignment(size_t& var, size_t val); |
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// Collection of generations that are adjacent in the |
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// space reserved for the heap. |
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AdjoiningGenerations* _gens; |
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static GCTaskManager* _gc_task_manager; // The task manager. |
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protected: |
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static inline size_t total_invocations(); |
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HeapWord* allocate_new_tlab(size_t size); |
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public: |
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ParallelScavengeHeap() : CollectedHeap() { |
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set_alignment(_perm_gen_alignment, intra_heap_alignment()); |
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set_alignment(_young_gen_alignment, intra_heap_alignment()); |
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set_alignment(_old_gen_alignment, intra_heap_alignment()); |
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} |
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// For use by VM operations |
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enum CollectionType { |
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Scavenge, |
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MarkSweep |
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}; |
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ParallelScavengeHeap::Name kind() const { |
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return CollectedHeap::ParallelScavengeHeap; |
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} |
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CollectorPolicy* collector_policy() const { return (CollectorPolicy*) _collector_policy; } |
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// GenerationSizer* collector_policy() const { return _collector_policy; } |
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static PSYoungGen* young_gen() { return _young_gen; } |
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static PSOldGen* old_gen() { return _old_gen; } |
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static PSPermGen* perm_gen() { return _perm_gen; } |
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virtual PSAdaptiveSizePolicy* size_policy() { return _size_policy; } |
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static PSGCAdaptivePolicyCounters* gc_policy_counters() { return _gc_policy_counters; } |
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static ParallelScavengeHeap* heap(); |
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static GCTaskManager* const gc_task_manager() { return _gc_task_manager; } |
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AdjoiningGenerations* gens() { return _gens; } |
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// Returns JNI_OK on success |
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virtual jint initialize(); |
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void post_initialize(); |
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void update_counters(); |
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// The alignment used for the various generations. |
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size_t perm_gen_alignment() const { return _perm_gen_alignment; } |
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size_t young_gen_alignment() const { return _young_gen_alignment; } |
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size_t old_gen_alignment() const { return _old_gen_alignment; } |
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// The alignment used for eden and survivors within the young gen |
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// and for boundary between young gen and old gen. |
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size_t intra_heap_alignment() const { return 64 * K; } |
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size_t capacity() const; |
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size_t used() const; |
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// Return "true" if all generations (but perm) have reached the |
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// maximal committed limit that they can reach, without a garbage |
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// collection. |
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virtual bool is_maximal_no_gc() const; |
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// Does this heap support heap inspection? (+PrintClassHistogram) |
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bool supports_heap_inspection() const { return true; } |
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size_t permanent_capacity() const; |
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size_t permanent_used() const; |
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size_t max_capacity() const; |
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// Whether p is in the allocated part of the heap |
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bool is_in(const void* p) const; |
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bool is_in_reserved(const void* p) const; |
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bool is_in_permanent(const void *p) const { // reserved part |
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return perm_gen()->reserved().contains(p); |
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} |
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bool is_permanent(const void *p) const { // committed part |
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return perm_gen()->is_in(p); |
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} |
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inline bool is_in_young(oop p); // reserved part |
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inline bool is_in_old_or_perm(oop p); // reserved part |
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// Memory allocation. "gc_time_limit_was_exceeded" will |
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// be set to true if the adaptive size policy determine that |
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// an excessive amount of time is being spent doing collections |
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// and caused a NULL to be returned. If a NULL is not returned, |
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// "gc_time_limit_was_exceeded" has an undefined meaning. |
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HeapWord* mem_allocate(size_t size, |
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bool is_noref, |
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bool is_tlab, |
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bool* gc_overhead_limit_was_exceeded); |
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HeapWord* failed_mem_allocate(size_t size, bool is_tlab); |
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HeapWord* permanent_mem_allocate(size_t size); |
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HeapWord* failed_permanent_mem_allocate(size_t size); |
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// Support for System.gc() |
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void collect(GCCause::Cause cause); |
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// This interface assumes that it's being called by the |
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// vm thread. It collects the heap assuming that the |
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// heap lock is already held and that we are executing in |
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// the context of the vm thread. |
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void collect_as_vm_thread(GCCause::Cause cause); |
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// These also should be called by the vm thread at a safepoint (e.g., from a |
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// VM operation). |
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// |
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// The first collects the young generation only, unless the scavenge fails; it |
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// will then attempt a full gc. The second collects the entire heap; if |
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// maximum_compaction is true, it will compact everything and clear all soft |
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// references. |
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inline void invoke_scavenge(); |
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inline void invoke_full_gc(bool maximum_compaction); |
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size_t large_typearray_limit() { return FastAllocateSizeLimit; } |
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bool supports_inline_contig_alloc() const { return !UseNUMA; } |
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HeapWord** top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord**)-1; } |
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HeapWord** end_addr() const { return !UseNUMA ? young_gen()->end_addr() : (HeapWord**)-1; } |
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void ensure_parsability(bool retire_tlabs); |
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void accumulate_statistics_all_tlabs(); |
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void resize_all_tlabs(); |
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size_t unsafe_max_alloc(); |
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bool supports_tlab_allocation() const { return true; } |
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size_t tlab_capacity(Thread* thr) const; |
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size_t unsafe_max_tlab_alloc(Thread* thr) const; |
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// Can a compiler initialize a new object without store barriers? |
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// This permission only extends from the creation of a new object |
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// via a TLAB up to the first subsequent safepoint. |
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virtual bool can_elide_tlab_store_barriers() const { |
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return true; |
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} |
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virtual bool card_mark_must_follow_store() const { |
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return false; |
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} |
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// Return true if we don't we need a store barrier for |
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// initializing stores to an object at this address. |
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virtual bool can_elide_initializing_store_barrier(oop new_obj); |
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// Can a compiler elide a store barrier when it writes |
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// a permanent oop into the heap? Applies when the compiler |
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// is storing x to the heap, where x->is_perm() is true. |
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virtual bool can_elide_permanent_oop_store_barriers() const { |
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return true; |
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} |
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void oop_iterate(OopClosure* cl); |
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void object_iterate(ObjectClosure* cl); |
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void safe_object_iterate(ObjectClosure* cl) { object_iterate(cl); } |
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void permanent_oop_iterate(OopClosure* cl); |
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void permanent_object_iterate(ObjectClosure* cl); |
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HeapWord* block_start(const void* addr) const; |
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size_t block_size(const HeapWord* addr) const; |
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bool block_is_obj(const HeapWord* addr) const; |
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jlong millis_since_last_gc(); |
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void prepare_for_verify(); |
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void print() const; |
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void print_on(outputStream* st) const; |
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virtual void print_gc_threads_on(outputStream* st) const; |
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virtual void gc_threads_do(ThreadClosure* tc) const; |
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virtual void print_tracing_info() const; |
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void verify(bool allow_dirty, bool silent, bool /* option */); |
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void print_heap_change(size_t prev_used); |
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// Resize the young generation. The reserved space for the |
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// generation may be expanded in preparation for the resize. |
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void resize_young_gen(size_t eden_size, size_t survivor_size); |
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// Resize the old generation. The reserved space for the |
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// generation may be expanded in preparation for the resize. |
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void resize_old_gen(size_t desired_free_space); |
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// Save the tops of the spaces in all generations |
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void record_gen_tops_before_GC() PRODUCT_RETURN; |
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// Mangle the unused parts of all spaces in the heap |
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void gen_mangle_unused_area() PRODUCT_RETURN; |
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// Call these in sequential code around the processing of strong roots. |
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class ParStrongRootsScope : public MarkingCodeBlobClosure::MarkScope { |
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public: |
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ParStrongRootsScope(); |
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~ParStrongRootsScope(); |
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}; |
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}; |
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inline size_t ParallelScavengeHeap::set_alignment(size_t& var, size_t val) |
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{ |
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assert(is_power_of_2((intptr_t)val), "must be a power of 2"); |
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var = round_to(val, intra_heap_alignment()); |
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return var; |
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} |