author | trims |
Thu, 27 May 2010 19:08:38 -0700 | |
changeset 5547 | f4b087cbb361 |
parent 1623 | a0dd9009e992 |
child 6985 | e9364ec299ac |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2008, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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// TenuredGeneration models the heap containing old (promoted/tenured) objects. |
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class ParGCAllocBufferWithBOT; |
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class TenuredGeneration: public OneContigSpaceCardGeneration { |
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friend class VMStructs; |
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protected: |
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// current shrinking effect: this damps shrinking when the heap gets empty. |
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size_t _shrink_factor; |
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// Some statistics from before gc started. |
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// These are gathered in the gc_prologue (and should_collect) |
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// to control growing/shrinking policy in spite of promotions. |
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size_t _capacity_at_prologue; |
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size_t _used_at_prologue; |
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#ifndef SERIALGC |
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// To support parallel promotion: an array of parallel allocation |
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// buffers, one per thread, initially NULL. |
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ParGCAllocBufferWithBOT** _alloc_buffers; |
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#endif // SERIALGC |
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// Retire all alloc buffers before a full GC, so that they will be |
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// re-allocated at the start of the next young GC. |
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void retire_alloc_buffers_before_full_gc(); |
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GenerationCounters* _gen_counters; |
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CSpaceCounters* _space_counters; |
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public: |
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TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level, |
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GenRemSet* remset); |
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Generation::Name kind() { return Generation::MarkSweepCompact; } |
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// Printing |
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const char* name() const; |
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const char* short_name() const { return "Tenured"; } |
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bool must_be_youngest() const { return false; } |
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bool must_be_oldest() const { return true; } |
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// Does a "full" (forced) collection invoked on this generation collect |
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// all younger generations as well? Note that this is a |
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// hack to allow the collection of the younger gen first if the flag is |
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// set. This is better than using th policy's should_collect_gen0_first() |
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// since that causes us to do an extra unnecessary pair of restart-&-stop-world. |
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virtual bool full_collects_younger_generations() const { |
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return !CollectGen0First; |
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} |
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// Mark sweep support |
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void compute_new_size(); |
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virtual void gc_prologue(bool full); |
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virtual void gc_epilogue(bool full); |
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bool should_collect(bool full, |
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size_t word_size, |
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bool is_tlab); |
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virtual void collect(bool full, |
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bool clear_all_soft_refs, |
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size_t size, |
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bool is_tlab); |
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#ifndef SERIALGC |
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// Overrides. |
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virtual oop par_promote(int thread_num, |
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oop obj, markOop m, size_t word_sz); |
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virtual void par_promote_alloc_undo(int thread_num, |
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HeapWord* obj, size_t word_sz); |
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virtual void par_promote_alloc_done(int thread_num); |
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#endif // SERIALGC |
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// Performance Counter support |
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void update_counters(); |
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// Statistics |
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virtual void update_gc_stats(int level, bool full); |
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virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes, |
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bool younger_handles_promotion_failure) const; |
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void verify_alloc_buffers_clean(); |
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}; |