Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 2001-2009 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.

  *

  */

 class AdjoiningGenerations;

 class GCTaskManager;

 class PSAdaptiveSizePolicy;

 class ParallelScavengeHeap : public CollectedHeap {

   friend class VMStructs;

  private:

   static PSYoungGen* _young_gen;

   static PSOldGen*   _old_gen;

   static PSPermGen*  _perm_gen;

   // Sizing policy for entire heap

   static PSAdaptiveSizePolicy* _size_policy;

   static PSGCAdaptivePolicyCounters*   _gc_policy_counters;

   static ParallelScavengeHeap* _psh;

   size_t _perm_gen_alignment;

   size_t _young_gen_alignment;

   size_t _old_gen_alignment;

   inline size_t set_alignment(size_t& var, size_t val);

   // Collection of generations that are adjacent in the

   // space reserved for the heap.

   AdjoiningGenerations* _gens;

   static GCTaskManager*          _gc_task_manager;      // The task manager.

  protected:

   static inline size_t total_invocations();

   HeapWord* allocate_new_tlab(size_t size);

   void fill_all_tlabs(bool retire);

  public:

   ParallelScavengeHeap() : CollectedHeap() {

     set_alignment(_perm_gen_alignment, intra_heap_alignment());

     set_alignment(_young_gen_alignment, intra_heap_alignment());

     set_alignment(_old_gen_alignment, intra_heap_alignment());

   }

   // For use by VM operations

   enum CollectionType {

     Scavenge,

     MarkSweep

   };

   ParallelScavengeHeap::Name kind() const {

     return CollectedHeap::ParallelScavengeHeap;

   }

   static PSYoungGen* young_gen()     { return _young_gen; }

   static PSOldGen* old_gen()         { return _old_gen; }

   static PSPermGen* perm_gen()       { return _perm_gen; }

   virtual PSAdaptiveSizePolicy* size_policy() { return _size_policy; }

   static PSGCAdaptivePolicyCounters* gc_policy_counters() { return _gc_policy_counters; }

   static ParallelScavengeHeap* heap();

   static GCTaskManager* const gc_task_manager() { return _gc_task_manager; }

   AdjoiningGenerations* gens() { return _gens; }

   // Returns JNI_OK on success

   virtual jint initialize();

   void post_initialize();

   void update_counters();

   // The alignment used for the various generations.

   size_t perm_gen_alignment()  const { return _perm_gen_alignment; }

   size_t young_gen_alignment() const { return _young_gen_alignment; }

   size_t old_gen_alignment()  const { return _old_gen_alignment; }

   // The alignment used for eden and survivors within the young gen

   // and for boundary between young gen and old gen.

   size_t intra_heap_alignment() const { return 64 * K; }

   size_t capacity() const;

   size_t used() const;

   // Return "true" if all generations (but perm) have reached the

   // maximal committed limit that they can reach, without a garbage

   // collection.

   virtual bool is_maximal_no_gc() const;

   // Does this heap support heap inspection? (+PrintClassHistogram)

   bool supports_heap_inspection() const { return true; }

   size_t permanent_capacity() const;

   size_t permanent_used() const;

   size_t max_capacity() const;

   // Whether p is in the allocated part of the heap

   bool is_in(const void* p) const;

   bool is_in_reserved(const void* p) const;

   bool is_in_permanent(const void *p) const {    // reserved part

     return perm_gen()->reserved().contains(p);

   }

   bool is_permanent(const void *p) const {    // committed part

     return perm_gen()->is_in(p);

   }

   static bool is_in_young(oop *p);        // reserved part

   static bool is_in_old_or_perm(oop *p);  // reserved part

   // Memory allocation.   "gc_time_limit_was_exceeded" will

   // be set to true if the adaptive size policy determine that

   // an excessive amount of time is being spent doing collections

   // and caused a NULL to be returned.  If a NULL is not returned,

   // "gc_time_limit_was_exceeded" has an undefined meaning.

   HeapWord* mem_allocate(size_t size,

                          bool is_noref,

                          bool is_tlab,

                          bool* gc_overhead_limit_was_exceeded);

   HeapWord* failed_mem_allocate(size_t size, bool is_tlab);

   HeapWord* permanent_mem_allocate(size_t size);

   HeapWord* failed_permanent_mem_allocate(size_t size);

   // Support for System.gc()

   void collect(GCCause::Cause cause);

   // This interface assumes that it's being called by the

   // vm thread. It collects the heap assuming that the

   // heap lock is already held and that we are executing in

   // the context of the vm thread.

   void collect_as_vm_thread(GCCause::Cause cause);

   // These also should be called by the vm thread at a safepoint (e.g., from a

   // VM operation).

   //

   // The first collects the young generation only, unless the scavenge fails; it

   // will then attempt a full gc.  The second collects the entire heap; if

   // maximum_compaction is true, it will compact everything and clear all soft

   // references.

   inline void invoke_scavenge();

   inline void invoke_full_gc(bool maximum_compaction);

   size_t large_typearray_limit() { return FastAllocateSizeLimit; }

   bool supports_inline_contig_alloc() const { return !UseNUMA; }

   HeapWord** top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord**)-1; }

   HeapWord** end_addr() const { return !UseNUMA ? young_gen()->end_addr() : (HeapWord**)-1; }

   void ensure_parsability(bool retire_tlabs);

   void accumulate_statistics_all_tlabs();

   void resize_all_tlabs();

   size_t unsafe_max_alloc();

   bool supports_tlab_allocation() const { return true; }

   size_t tlab_capacity(Thread* thr) const;

   size_t unsafe_max_tlab_alloc(Thread* thr) const;

   // Can a compiler initialize a new object without store barriers?

   // This permission only extends from the creation of a new object

   // via a TLAB up to the first subsequent safepoint.

   virtual bool can_elide_tlab_store_barriers() const {

     return true;

   }

   // Can a compiler elide a store barrier when it writes

   // a permanent oop into the heap?  Applies when the compiler

   // is storing x to the heap, where x->is_perm() is true.

   virtual bool can_elide_permanent_oop_store_barriers() const {

     return true;

   }

   void oop_iterate(OopClosure* cl);

   void object_iterate(ObjectClosure* cl);

   void safe_object_iterate(ObjectClosure* cl) { object_iterate(cl); }

   void permanent_oop_iterate(OopClosure* cl);

   void permanent_object_iterate(ObjectClosure* cl);

   HeapWord* block_start(const void* addr) const;

   size_t block_size(const HeapWord* addr) const;

   bool block_is_obj(const HeapWord* addr) const;

   jlong millis_since_last_gc();

   void prepare_for_verify();

   void print() const;

   void print_on(outputStream* st) const;

   virtual void print_gc_threads_on(outputStream* st) const;

   virtual void gc_threads_do(ThreadClosure* tc) const;

   virtual void print_tracing_info() const;

   void verify(bool allow_dirty, bool silent);

   void print_heap_change(size_t prev_used);

   // Resize the young generation.  The reserved space for the

   // generation may be expanded in preparation for the resize.

   void resize_young_gen(size_t eden_size, size_t survivor_size);

   // Resize the old generation.  The reserved space for the

   // generation may be expanded in preparation for the resize.

   void resize_old_gen(size_t desired_free_space);

   // Save the tops of the spaces in all generations

   void record_gen_tops_before_GC() PRODUCT_RETURN;

   // Mangle the unused parts of all spaces in the heap

   void gen_mangle_unused_area() PRODUCT_RETURN;

 };

 inline size_t ParallelScavengeHeap::set_alignment(size_t& var, size_t val)

 {

   assert(is_power_of_2((intptr_t)val), "must be a power of 2");

   var = round_to(val, intra_heap_alignment());

   return var;

 }