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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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6
hotspot/src/share/vm/memory/referenceProcessor.cpp
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@ -721,12 +721,6 @@ ReferenceProcessor::process_phase3(DiscoveredList& refs_list,
iter.obj(), iter.obj()->blueprint()->internal_name());
}
assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference");
// If discovery is concurrent, we may have objects with null referents,
// being those that were concurrently cleared after they were discovered
// (and not subsequently precleaned).
assert( (discovery_is_atomic() && iter.referent()->is_oop())
|| (!discovery_is_atomic() && iter.referent()->is_oop_or_null(UseConcMarkSweepGC)),
"Adding a bad referent");
iter.next();
}
// Remember to keep sentinel pointer around