Thu, 06 Jan 2011 23:50:02 -0800
7008136: CMS: assert((HeapWord*)nextChunk <= _limit) failed: sweep invariant
Summary: The recorded _sweep_limit may not necessarily remain a block boundary as the old generation expands during a concurrent cycle. Terminal actions inside the sweep closure need to be aware of this as they cross over the limit.
Reviewed-by: johnc, minqi
1 /*
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_FREEBLOCKDICTIONARY_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_FREEBLOCKDICTIONARY_HPP
28 #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp"
29 #include "memory/allocation.hpp"
30 #include "memory/memRegion.hpp"
31 #include "runtime/mutex.hpp"
32 #include "utilities/debug.hpp"
33 #include "utilities/globalDefinitions.hpp"
34 #include "utilities/ostream.hpp"
36 // A FreeBlockDictionary is an abstract superclass that will allow
37 // a number of alternative implementations in the future.
38 class FreeBlockDictionary: public CHeapObj {
39 public:
40 enum Dither {
41 atLeast,
42 exactly,
43 roughly
44 };
45 enum DictionaryChoice {
46 dictionaryBinaryTree = 0,
47 dictionarySplayTree = 1,
48 dictionarySkipList = 2
49 };
51 private:
52 NOT_PRODUCT(Mutex* _lock;)
54 public:
55 virtual void removeChunk(FreeChunk* fc) = 0;
56 virtual FreeChunk* getChunk(size_t size, Dither dither = atLeast) = 0;
57 virtual void returnChunk(FreeChunk* chunk) = 0;
58 virtual size_t totalChunkSize(debug_only(const Mutex* lock)) const = 0;
59 virtual size_t maxChunkSize() const = 0;
60 virtual size_t minSize() const = 0;
61 // Reset the dictionary to the initial conditions for a single
62 // block.
63 virtual void reset(HeapWord* addr, size_t size) = 0;
64 virtual void reset() = 0;
66 virtual void dictCensusUpdate(size_t size, bool split, bool birth) = 0;
67 virtual bool coalDictOverPopulated(size_t size) = 0;
68 virtual void beginSweepDictCensus(double coalSurplusPercent,
69 float inter_sweep_current, float inter_sweep_estimate,
70 float intra__sweep_current) = 0;
71 virtual void endSweepDictCensus(double splitSurplusPercent) = 0;
72 virtual FreeChunk* findLargestDict() const = 0;
73 // verify that the given chunk is in the dictionary.
74 virtual bool verifyChunkInFreeLists(FreeChunk* tc) const = 0;
76 // Sigma_{all_free_blocks} (block_size^2)
77 virtual double sum_of_squared_block_sizes() const = 0;
79 virtual FreeChunk* find_chunk_ends_at(HeapWord* target) const = 0;
80 virtual void inc_totalSize(size_t v) = 0;
81 virtual void dec_totalSize(size_t v) = 0;
83 NOT_PRODUCT (
84 virtual size_t sumDictReturnedBytes() = 0;
85 virtual void initializeDictReturnedBytes() = 0;
86 virtual size_t totalCount() = 0;
87 )
89 virtual void reportStatistics() const {
90 gclog_or_tty->print("No statistics available");
91 }
93 virtual void printDictCensus() const = 0;
94 virtual void print_free_lists(outputStream* st) const = 0;
96 virtual void verify() const = 0;
98 Mutex* par_lock() const PRODUCT_RETURN0;
99 void set_par_lock(Mutex* lock) PRODUCT_RETURN;
100 void verify_par_locked() const PRODUCT_RETURN;
101 };
103 #endif // SHARE_VM_GC_IMPLEMENTATION_CONCURRENTMARKSWEEP_FREEBLOCKDICTIONARY_HPP