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6794422: Perm gen expansion policy for concurrent collectors

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Concurrent collectors should expand the perm gen without a full STW GC, but possibly by triggering a concurrent collection. Temporary band-aid for G1 where no concurrent collection is kicked off since the perm gen is not collected concurrently.

Reviewed-by: johnc
This commit is contained in:
Y. Srinivas Ramakrishna 2010-10-01 16:12:54 -07:00
parent 603e50f355
commit 8fbdf5c7f0
5 changed files with 52 additions and 9 deletions
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14
hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2007, 2010, 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
@ -50,6 +50,18 @@ HeapWord* CMSPermGen::mem_allocate(size_t size) {
}
}
HeapWord* CMSPermGen::request_expand_and_allocate(Generation* gen,
size_t size,
GCCause::Cause prev_cause /* ignored */) {
HeapWord* obj = gen->expand_and_allocate(size, false);
if (gen->capacity() >= _capacity_expansion_limit) {
set_capacity_expansion_limit(gen->capacity() + MaxPermHeapExpansion);
assert(((ConcurrentMarkSweepGeneration*)gen)->should_concurrent_collect(),
"Should kick off a collection if one not in progress");
}
return obj;
}
void CMSPermGen::compute_new_size() {
_gen->compute_new_size();
}

4
hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsPermGen.hpp
View file

@ -33,6 +33,10 @@ class CMSPermGen: public PermGen {
// The "generation" view.
ConcurrentMarkSweepGeneration* _gen;
// Override default implementation from PermGen
virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size,
GCCause::Cause prev_cause);
public:
CMSPermGen(ReservedSpace rs, size_t initial_byte_size,
CardTableRS* ct, FreeBlockDictionary::DictionaryChoice);