Tue, 30 Oct 2012 10:23:55 -0700
8000988: VM deadlock when running btree006 on windows-i586
Reviewed-by: johnc, jcoomes, ysr
1 /*
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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13 * accompanied this code).
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23 */
25 #ifndef SHARE_VM_MEMORY_TENUREDGENERATION_HPP
26 #define SHARE_VM_MEMORY_TENUREDGENERATION_HPP
28 #include "gc_implementation/shared/cSpaceCounters.hpp"
29 #include "gc_implementation/shared/gcStats.hpp"
30 #include "gc_implementation/shared/generationCounters.hpp"
31 #include "memory/generation.hpp"
33 // TenuredGeneration models the heap containing old (promoted/tenured) objects.
35 class ParGCAllocBufferWithBOT;
37 class TenuredGeneration: public OneContigSpaceCardGeneration {
38 friend class VMStructs;
39 protected:
40 // current shrinking effect: this damps shrinking when the heap gets empty.
41 size_t _shrink_factor;
42 // Some statistics from before gc started.
43 // These are gathered in the gc_prologue (and should_collect)
44 // to control growing/shrinking policy in spite of promotions.
45 size_t _capacity_at_prologue;
46 size_t _used_at_prologue;
48 #ifndef SERIALGC
49 // To support parallel promotion: an array of parallel allocation
50 // buffers, one per thread, initially NULL.
51 ParGCAllocBufferWithBOT** _alloc_buffers;
52 #endif // SERIALGC
54 // Retire all alloc buffers before a full GC, so that they will be
55 // re-allocated at the start of the next young GC.
56 void retire_alloc_buffers_before_full_gc();
58 GenerationCounters* _gen_counters;
59 CSpaceCounters* _space_counters;
61 public:
62 TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
63 GenRemSet* remset);
65 Generation::Name kind() { return Generation::MarkSweepCompact; }
67 // Printing
68 const char* name() const;
69 const char* short_name() const { return "Tenured"; }
70 bool must_be_youngest() const { return false; }
71 bool must_be_oldest() const { return true; }
73 // Does a "full" (forced) collection invoked on this generation collect
74 // all younger generations as well? Note that this is a
75 // hack to allow the collection of the younger gen first if the flag is
76 // set. This is better than using th policy's should_collect_gen0_first()
77 // since that causes us to do an extra unnecessary pair of restart-&-stop-world.
78 virtual bool full_collects_younger_generations() const {
79 return !CollectGen0First;
80 }
82 // Mark sweep support
83 void compute_new_size();
85 virtual void gc_prologue(bool full);
86 virtual void gc_epilogue(bool full);
87 bool should_collect(bool full,
88 size_t word_size,
89 bool is_tlab);
91 virtual void collect(bool full,
92 bool clear_all_soft_refs,
93 size_t size,
94 bool is_tlab);
96 #ifndef SERIALGC
97 // Overrides.
98 virtual oop par_promote(int thread_num,
99 oop obj, markOop m, size_t word_sz);
100 virtual void par_promote_alloc_undo(int thread_num,
101 HeapWord* obj, size_t word_sz);
102 virtual void par_promote_alloc_done(int thread_num);
103 #endif // SERIALGC
105 // Performance Counter support
106 void update_counters();
108 // Statistics
110 virtual void update_gc_stats(int level, bool full);
112 virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;
114 void verify_alloc_buffers_clean();
115 };
117 #endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP