26 #define SHARE_VM_GC_PARALLEL_ADJOININGGENERATIONS_HPP 27 28 #include "gc/parallel/adjoiningVirtualSpaces.hpp" 29 #include "gc/parallel/asPSOldGen.hpp" 30 #include "gc/parallel/asPSYoungGen.hpp" 31 #include "gc/parallel/generationSizer.hpp" 32 33 34 // Contains two generations that both use an AdjoiningVirtualSpaces. 35 // The two generations are adjacent in the reserved space for the 36 // heap. Each generation has a virtual space and shrinking and 37 // expanding of the generations can still be down with that 38 // virtual space as was previously done. If expanding of reserved 39 // size of a generation is required, the adjacent generation 40 // must be shrunk. Adjusting the boundary between the generations 41 // is called for in this class. 42 43 class AdjoiningGenerations : public CHeapObj<mtGC> { 44 friend class VMStructs; 45 private: 46 // The young generation and old generation, respectively 47 PSYoungGen* _young_gen; 48 PSOldGen* _old_gen; 49 50 // The spaces used by the two generations. 51 AdjoiningVirtualSpaces _virtual_spaces; 52 53 // Move boundary up to expand old gen. Checks are made to 54 // determine if the move can be done with specified limits. 55 void request_old_gen_expansion(size_t desired_change_in_bytes); 56 // Move boundary down to expand young gen. 57 bool request_young_gen_expansion(size_t desired_change_in_bytes); 58 59 public: 60 AdjoiningGenerations(ReservedSpace rs, GenerationSizer* policy, size_t alignment); 61 62 // Accessors 63 PSYoungGen* young_gen() { return _young_gen; } 64 PSOldGen* old_gen() { return _old_gen; } 65 66 AdjoiningVirtualSpaces* virtual_spaces() { return &_virtual_spaces; } 67 68 // Additional space is needed in the old generation. Check 69 // the available space and attempt to move the boundary if more space 70 // is needed. The growth is not guaranteed to occur. 71 void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes); 72 // Similarly for a growth of the young generation. 73 void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size); 74 75 // Return the total byte size of the reserved space 76 // for the adjoining generations. 77 size_t reserved_byte_size(); 78 }; 79 80 #endif // SHARE_VM_GC_PARALLEL_ADJOININGGENERATIONS_HPP | 26 #define SHARE_VM_GC_PARALLEL_ADJOININGGENERATIONS_HPP 27 28 #include "gc/parallel/adjoiningVirtualSpaces.hpp" 29 #include "gc/parallel/asPSOldGen.hpp" 30 #include "gc/parallel/asPSYoungGen.hpp" 31 #include "gc/parallel/generationSizer.hpp" 32 33 34 // Contains two generations that both use an AdjoiningVirtualSpaces. 35 // The two generations are adjacent in the reserved space for the 36 // heap. Each generation has a virtual space and shrinking and 37 // expanding of the generations can still be down with that 38 // virtual space as was previously done. If expanding of reserved 39 // size of a generation is required, the adjacent generation 40 // must be shrunk. Adjusting the boundary between the generations 41 // is called for in this class. 42 43 class AdjoiningGenerations : public CHeapObj<mtGC> { 44 friend class VMStructs; 45 private: 46 // Move boundary up to expand old gen. Checks are made to 47 // determine if the move can be done with specified limits. 48 void request_old_gen_expansion(size_t desired_change_in_bytes); 49 // Move boundary down to expand young gen. 50 bool request_young_gen_expansion(size_t desired_change_in_bytes); 51 52 protected: 53 // The young generation and old generation, respectively 54 PSYoungGen* _young_gen; 55 PSOldGen* _old_gen; 56 57 // The spaces used by the two generations. 58 AdjoiningVirtualSpaces* _virtual_spaces; 59 60 public: 61 AdjoiningGenerations(ReservedSpace rs, GenerationSizer* policy, size_t alignment); 62 AdjoiningGenerations(); 63 64 // Accessors 65 PSYoungGen* young_gen() { return _young_gen; } 66 PSOldGen* old_gen() { return _old_gen; } 67 68 AdjoiningVirtualSpaces* virtual_spaces() { return _virtual_spaces; } 69 70 // Additional space is needed in the old generation. Check 71 // the available space and attempt to move the boundary if more space 72 // is needed. The growth is not guaranteed to occur. 73 void adjust_boundary_for_old_gen_needs(size_t desired_change_in_bytes); 74 // Similarly for a growth of the young generation. 75 void adjust_boundary_for_young_gen_needs(size_t eden_size, size_t survivor_size); 76 77 // Return the total byte size of the reserved space 78 // for the adjoining generations. 79 virtual size_t reserved_byte_size(); 80 }; 81 #endif // SHARE_VM_GC_PARALLEL_ADJOININGGENERATIONS_HPP |