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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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9
hotspot/src/share/vm/memory/generation.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 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
@ -83,14 +83,11 @@ void Generation::print_heap_change(size_t prev_used) const {
}
// By default we get a single threaded default reference processor;
// generations needing multi-threaded refs discovery override this method.
// generations needing multi-threaded refs processing or discovery override this method.
void Generation::ref_processor_init() {
assert(_ref_processor == NULL, "a reference processor already exists");
assert(!_reserved.is_empty(), "empty generation?");
_ref_processor =
new ReferenceProcessor(_reserved, // span
refs_discovery_is_atomic(), // atomic_discovery
refs_discovery_is_mt()); // mt_discovery
_ref_processor = new ReferenceProcessor(_reserved); // a vanilla reference processor
if (_ref_processor == NULL) {
vm_exit_during_initialization("Could not allocate ReferenceProcessor object");
}