1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/memory/tenuredGeneration.hpp Wed Apr 27 01:25:04 2016 +0800
1.3 @@ -0,0 +1,109 @@
1.4 +/*
1.5 + * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +#ifndef SHARE_VM_MEMORY_TENUREDGENERATION_HPP
1.29 +#define SHARE_VM_MEMORY_TENUREDGENERATION_HPP
1.30 +
1.31 +#include "gc_implementation/shared/cSpaceCounters.hpp"
1.32 +#include "gc_implementation/shared/gcStats.hpp"
1.33 +#include "gc_implementation/shared/generationCounters.hpp"
1.34 +#include "memory/generation.hpp"
1.35 +#include "utilities/macros.hpp"
1.36 +
1.37 +// TenuredGeneration models the heap containing old (promoted/tenured) objects.
1.38 +
1.39 +class ParGCAllocBufferWithBOT;
1.40 +
1.41 +class TenuredGeneration: public OneContigSpaceCardGeneration {
1.42 + friend class VMStructs;
1.43 + protected:
1.44 +
1.45 +#if INCLUDE_ALL_GCS
1.46 + // To support parallel promotion: an array of parallel allocation
1.47 + // buffers, one per thread, initially NULL.
1.48 + ParGCAllocBufferWithBOT** _alloc_buffers;
1.49 +#endif // INCLUDE_ALL_GCS
1.50 +
1.51 + // Retire all alloc buffers before a full GC, so that they will be
1.52 + // re-allocated at the start of the next young GC.
1.53 + void retire_alloc_buffers_before_full_gc();
1.54 +
1.55 + GenerationCounters* _gen_counters;
1.56 + CSpaceCounters* _space_counters;
1.57 +
1.58 + public:
1.59 + TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
1.60 + GenRemSet* remset);
1.61 +
1.62 + Generation::Name kind() { return Generation::MarkSweepCompact; }
1.63 +
1.64 + // Printing
1.65 + const char* name() const;
1.66 + const char* short_name() const { return "Tenured"; }
1.67 + bool must_be_youngest() const { return false; }
1.68 + bool must_be_oldest() const { return true; }
1.69 +
1.70 + // Does a "full" (forced) collection invoked on this generation collect
1.71 + // all younger generations as well? Note that this is a
1.72 + // hack to allow the collection of the younger gen first if the flag is
1.73 + // set. This is better than using th policy's should_collect_gen0_first()
1.74 + // since that causes us to do an extra unnecessary pair of restart-&-stop-world.
1.75 + virtual bool full_collects_younger_generations() const {
1.76 + return !CollectGen0First;
1.77 + }
1.78 +
1.79 + virtual void gc_prologue(bool full);
1.80 + virtual void gc_epilogue(bool full);
1.81 + bool should_collect(bool full,
1.82 + size_t word_size,
1.83 + bool is_tlab);
1.84 +
1.85 + virtual void collect(bool full,
1.86 + bool clear_all_soft_refs,
1.87 + size_t size,
1.88 + bool is_tlab);
1.89 + virtual void compute_new_size();
1.90 +
1.91 +#if INCLUDE_ALL_GCS
1.92 + // Overrides.
1.93 + virtual oop par_promote(int thread_num,
1.94 + oop obj, markOop m, size_t word_sz);
1.95 + virtual void par_promote_alloc_undo(int thread_num,
1.96 + HeapWord* obj, size_t word_sz);
1.97 + virtual void par_promote_alloc_done(int thread_num);
1.98 +#endif // INCLUDE_ALL_GCS
1.99 +
1.100 + // Performance Counter support
1.101 + void update_counters();
1.102 +
1.103 + // Statistics
1.104 +
1.105 + virtual void update_gc_stats(int level, bool full);
1.106 +
1.107 + virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;
1.108 +
1.109 + void verify_alloc_buffers_clean();
1.110 +};
1.111 +
1.112 +#endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP
