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6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit

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Ensure a full GC that clears SoftReferences before throwing an out-of-memory

Reviewed-by: ysr, jcoomes
This commit is contained in:
Jon Masamitsu 2010-04-13 13:52:10 -07:00
parent ba815bf09e
commit f5197d0d36
26 changed files with 543 additions and 364 deletions
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15
hotspot/src/share/vm/gc_implementation/shared/vmGCOperations.hpp
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@ -1,5 +1,5 @@
/*
* Copyright 2005-2008 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 2005-2010 Sun Microsystems, Inc. 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
@ -89,8 +89,19 @@ class VM_GC_Operation: public VM_Operation {
if (full) {
_full_gc_count_before = full_gc_count_before;
}
// In ParallelScavengeHeap::mem_allocate() collections can be
// executed within a loop and _all_soft_refs_clear can be set
// true after they have been cleared by a collection and another
// collection started so that _all_soft_refs_clear can be true
// when this collection is started. Don't assert that
// _all_soft_refs_clear have to be false here even though
// mutators have run. Soft refs will be cleared again in this
// collection.
}
~VM_GC_Operation() {
CollectedHeap* ch = Universe::heap();
ch->collector_policy()->set_all_soft_refs_clear(false);
}
~VM_GC_Operation() {}
// Acquire the reference synchronization lock
virtual bool doit_prologue();