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6786503: Overflow list performance can be improved

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Avoid overflow list walk in CMS & ParNew when it is unnecessary. Fix a couple of correctness issues, including a C-heap leak, in ParNew at the intersection of promotion failure, work queue overflow and object array chunking. Add stress testing option and related assertion checking.

Reviewed-by: jmasa
This commit is contained in:
Y. Srinivas Ramakrishna 2009-01-26 12:47:21 -08:00
parent 8109aa4a16
commit f031c45430
7 changed files with 294 additions and 78 deletions
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8
hotspot/src/share/vm/gc_implementation/parNew/parNewGeneration.hpp
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@ -278,6 +278,7 @@ class ParNewGeneration: public DefNewGeneration {
friend class ParNewRefProcTask;
friend class ParNewRefProcTaskExecutor;
friend class ParScanThreadStateSet;
friend class ParEvacuateFollowersClosure;
private:
// XXX use a global constant instead of 64!
@ -296,6 +297,7 @@ class ParNewGeneration: public DefNewGeneration {
// klass-pointers (klass information already copied to the forwarded
// image.) Manipulated with CAS.
oop _overflow_list;
NOT_PRODUCT(ssize_t _num_par_pushes;)
// If true, older generation does not support promotion undo, so avoid.
static bool _avoid_promotion_undo;
@ -372,8 +374,12 @@ class ParNewGeneration: public DefNewGeneration {
oop copy_to_survivor_space_with_undo(ParScanThreadState* par_scan_state,
oop obj, size_t obj_sz, markOop m);
// in support of testing overflow code
NOT_PRODUCT(int _overflow_counter;)
NOT_PRODUCT(bool should_simulate_overflow();)
// Push the given (from-space) object on the global overflow list.
void push_on_overflow_list(oop from_space_obj);
void push_on_overflow_list(oop from_space_obj, ParScanThreadState* par_scan_state);
// If the global overflow list is non-empty, move some tasks from it
// onto "work_q" (which must be empty). No more than 1/4 of the