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6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads

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Use _max_num_q = max(discovery_degree, processing_degree), and let balance_queues() redistribute from discovery_degree to processing_degree of queues. This should also allow a more dynamic and flexible parallelism policy in the future.

Reviewed-by: jmasa, johnc
This commit is contained in:
Y. Srinivas Ramakrishna 2011-03-17 10:32:46 -07:00
parent 7293fabc43
commit b4b287e7ac
13 changed files with 148 additions and 153 deletions
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18
hotspot/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -827,13 +827,15 @@ void PSParallelCompact::post_initialize() {
assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
MemRegion mr = heap->reserved_region();
_ref_processor = ReferenceProcessor::create_ref_processor(
mr, // span
true, // atomic_discovery
true, // mt_discovery
&_is_alive_closure,
ParallelGCThreads,
ParallelRefProcEnabled);
_ref_processor =
new ReferenceProcessor(mr, // span
ParallelRefProcEnabled && (ParallelGCThreads > 1), // mt processing
(int) ParallelGCThreads, // mt processing degree
true, // mt discovery
(int) ParallelGCThreads, // mt discovery degree
true, // atomic_discovery
&_is_alive_closure, // non-header is alive closure
false); // write barrier for next field updates
_counters = new CollectorCounters("PSParallelCompact", 1);
// Initialize static fields in ParCompactionManager.