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comparison src/share/vm/memory/defNewGeneration.hpp @ 2038:74ee0db180fa

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6807801: CMS: could save/restore fewer header words during scavenge Summary: Age bits need not enter the mark-word preservation calculus; also affected, in addition to CMS, per CR synopsis above, were ParNew (but not DefNew), ParallelScavenge and G1, albeit to a lesser degree than CMS. Reviewed-by: tonyp, johnc
author ysr
date Fri, 17 Dec 2010 23:41:31 -0800
parents f95d63e2154a
children b632e80fc9dc
comparison
equal deleted inserted replaced
2037:b03260081e9b 2038:74ee0db180fa
83 void remove_forwarding_pointers(); 83 void remove_forwarding_pointers();
84 84
85 // Preserve the mark of "obj", if necessary, in preparation for its mark 85 // Preserve the mark of "obj", if necessary, in preparation for its mark
86 // word being overwritten with a self-forwarding-pointer. 86 // word being overwritten with a self-forwarding-pointer.
87 void preserve_mark_if_necessary(oop obj, markOop m); 87 void preserve_mark_if_necessary(oop obj, markOop m);
88 void preserve_mark(oop obj, markOop m); // work routine used by the above
88 89
89 // Together, these keep <object with a preserved mark, mark value> pairs. 90 // Together, these keep <object with a preserved mark, mark value> pairs.
90 // They should always contain the same number of elements. 91 // They should always contain the same number of elements.
91 Stack<oop> _objs_with_preserved_marks; 92 Stack<oop> _objs_with_preserved_marks;
92 Stack<markOop> _preserved_marks_of_objs; 93 Stack<markOop> _preserved_marks_of_objs;