aoqi@0: /*
aoqi@0:  * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  *
aoqi@0:  */
aoqi@0: 
aoqi@0: #ifndef SHARE_VM_MEMORY_TENUREDGENERATION_HPP
aoqi@0: #define SHARE_VM_MEMORY_TENUREDGENERATION_HPP
aoqi@0: 
aoqi@0: #include "gc_implementation/shared/cSpaceCounters.hpp"
aoqi@0: #include "gc_implementation/shared/gcStats.hpp"
aoqi@0: #include "gc_implementation/shared/generationCounters.hpp"
aoqi@0: #include "memory/generation.hpp"
aoqi@0: #include "utilities/macros.hpp"
aoqi@0: 
aoqi@0: // TenuredGeneration models the heap containing old (promoted/tenured) objects.
aoqi@0: 
aoqi@0: class ParGCAllocBufferWithBOT;
aoqi@0: 
aoqi@0: class TenuredGeneration: public OneContigSpaceCardGeneration {
aoqi@0:   friend class VMStructs;
aoqi@0:  protected:
aoqi@0: 
aoqi@0: #if INCLUDE_ALL_GCS
aoqi@0:   // To support parallel promotion: an array of parallel allocation
aoqi@0:   // buffers, one per thread, initially NULL.
aoqi@0:   ParGCAllocBufferWithBOT** _alloc_buffers;
aoqi@0: #endif // INCLUDE_ALL_GCS
aoqi@0: 
aoqi@0:   // Retire all alloc buffers before a full GC, so that they will be
aoqi@0:   // re-allocated at the start of the next young GC.
aoqi@0:   void retire_alloc_buffers_before_full_gc();
aoqi@0: 
aoqi@0:   GenerationCounters*   _gen_counters;
aoqi@0:   CSpaceCounters*       _space_counters;
aoqi@0: 
aoqi@0:  public:
aoqi@0:   TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
aoqi@0:                     GenRemSet* remset);
aoqi@0: 
aoqi@0:   Generation::Name kind() { return Generation::MarkSweepCompact; }
aoqi@0: 
aoqi@0:   // Printing
aoqi@0:   const char* name() const;
aoqi@0:   const char* short_name() const { return "Tenured"; }
aoqi@0:   bool must_be_youngest() const { return false; }
aoqi@0:   bool must_be_oldest() const { return true; }
aoqi@0: 
aoqi@0:   // Does a "full" (forced) collection invoked on this generation collect
aoqi@0:   // all younger generations as well? Note that this is a
aoqi@0:   // hack to allow the collection of the younger gen first if the flag is
aoqi@0:   // set. This is better than using th policy's should_collect_gen0_first()
aoqi@0:   // since that causes us to do an extra unnecessary pair of restart-&-stop-world.
aoqi@0:   virtual bool full_collects_younger_generations() const {
aoqi@0:     return !CollectGen0First;
aoqi@0:   }
aoqi@0: 
aoqi@0:   virtual void gc_prologue(bool full);
aoqi@0:   virtual void gc_epilogue(bool full);
aoqi@0:   bool should_collect(bool   full,
aoqi@0:                       size_t word_size,
aoqi@0:                       bool   is_tlab);
aoqi@0: 
aoqi@0:   virtual void collect(bool full,
aoqi@0:                        bool clear_all_soft_refs,
aoqi@0:                        size_t size,
aoqi@0:                        bool is_tlab);
aoqi@0:   virtual void compute_new_size();
aoqi@0: 
aoqi@0: #if INCLUDE_ALL_GCS
aoqi@0:   // Overrides.
aoqi@0:   virtual oop par_promote(int thread_num,
aoqi@0:                           oop obj, markOop m, size_t word_sz);
aoqi@0:   virtual void par_promote_alloc_undo(int thread_num,
aoqi@0:                                       HeapWord* obj, size_t word_sz);
aoqi@0:   virtual void par_promote_alloc_done(int thread_num);
aoqi@0: #endif // INCLUDE_ALL_GCS
aoqi@0: 
aoqi@0:   // Performance Counter support
aoqi@0:   void update_counters();
aoqi@0: 
aoqi@0:   // Statistics
aoqi@0: 
aoqi@0:   virtual void update_gc_stats(int level, bool full);
aoqi@0: 
aoqi@0:   virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;
aoqi@0: 
aoqi@0:   void verify_alloc_buffers_clean();
aoqi@0: };
aoqi@0: 
aoqi@0: #endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP