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8008508: CMS does not correctly reduce heap size after a Full GC

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Reviewed-by: johnc, ysr
This commit is contained in:
Jon Masamitsu 2013-02-11 10:31:56 -08:00
parent 90d010120f
commit fabb8c6e25
7 changed files with 269 additions and 230 deletions
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20
hotspot/src/share/vm/memory/generation.hpp
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@ -634,6 +634,17 @@ class CardGeneration: public Generation {
// This is local to this generation.
BlockOffsetSharedArray* _bts;
// current shrinking effect: this damps shrinking when the heap gets empty.
size_t _shrink_factor;
size_t _min_heap_delta_bytes; // Minimum amount to expand.
// Some statistics from before gc started.
// These are gathered in the gc_prologue (and should_collect)
// to control growing/shrinking policy in spite of promotions.
size_t _capacity_at_prologue;
size_t _used_at_prologue;
CardGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
GenRemSet* remset);
@ -644,6 +655,11 @@ class CardGeneration: public Generation {
// necessarily the full "bytes") was done.
virtual bool expand(size_t bytes, size_t expand_bytes);
// Shrink generation with specified size (returns false if unable to shrink)
virtual void shrink(size_t bytes) = 0;
virtual void compute_new_size();
virtual void clear_remembered_set();
virtual void invalidate_remembered_set();
@ -667,7 +683,6 @@ class OneContigSpaceCardGeneration: public CardGeneration {
friend class VM_PopulateDumpSharedSpace;
protected:
size_t _min_heap_delta_bytes; // Minimum amount to expand.
ContiguousSpace* _the_space; // actual space holding objects
WaterMark _last_gc; // watermark between objects allocated before
// and after last GC.
@ -688,11 +703,10 @@ class OneContigSpaceCardGeneration: public CardGeneration {
public:
OneContigSpaceCardGeneration(ReservedSpace rs, size_t initial_byte_size,
size_t min_heap_delta_bytes,
int level, GenRemSet* remset,
ContiguousSpace* space) :
CardGeneration(rs, initial_byte_size, level, remset),
_the_space(space), _min_heap_delta_bytes(min_heap_delta_bytes)
_the_space(space)
{}
inline bool is_in(const void* p) const;