Mercurial > hg > graal-jvmci-8
diff src/share/vm/gc_implementation/concurrentMarkSweep/freeList.hpp @ 1145:e018e6884bd8
6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa
| author | ysr |
|---|---|
| date | Wed, 23 Dec 2009 09:23:54 -0800 |
| parents | d1605aabd0a1 |
| children | c18cbe5936b8 |
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--- a/src/share/vm/gc_implementation/concurrentMarkSweep/freeList.hpp Wed Dec 16 15:12:51 2009 -0800 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/freeList.hpp Wed Dec 23 09:23:54 2009 -0800 @@ -35,18 +35,26 @@ // for that implementation. class Mutex; +class TreeList; class FreeList VALUE_OBJ_CLASS_SPEC { friend class CompactibleFreeListSpace; friend class VMStructs; - friend class printTreeCensusClosure; - FreeChunk* _head; // List of free chunks + friend class PrintTreeCensusClosure; + + protected: + TreeList* _parent; + TreeList* _left; + TreeList* _right; + + private: + FreeChunk* _head; // Head of list of free chunks FreeChunk* _tail; // Tail of list of free chunks - size_t _size; // Size in Heap words of each chunks + size_t _size; // Size in Heap words of each chunk ssize_t _count; // Number of entries in list size_t _hint; // next larger size list with a positive surplus - AllocationStats _allocation_stats; // statistics for smart allocation + AllocationStats _allocation_stats; // allocation-related statistics #ifdef ASSERT Mutex* _protecting_lock; @@ -63,9 +71,12 @@ // Initialize the allocation statistics. protected: - void init_statistics(); + void init_statistics(bool split_birth = false); void set_count(ssize_t v) { _count = v;} - void increment_count() { _count++; } + void increment_count() { + _count++; + } + void decrement_count() { _count--; assert(_count >= 0, "Count should not be negative"); @@ -167,11 +178,13 @@ _allocation_stats.set_desired(v); } void compute_desired(float inter_sweep_current, - float inter_sweep_estimate) { + float inter_sweep_estimate, + float intra_sweep_estimate) { assert_proper_lock_protection(); _allocation_stats.compute_desired(_count, inter_sweep_current, - inter_sweep_estimate); + inter_sweep_estimate, + intra_sweep_estimate); } ssize_t coalDesired() const { return _allocation_stats.coalDesired(); @@ -306,6 +319,9 @@ // found. Return NULL if "fc" is not found. bool verifyChunkInFreeLists(FreeChunk* fc) const; + // Stats verification + void verify_stats() const PRODUCT_RETURN; + // Printing support static void print_labels_on(outputStream* st, const char* c); void print_on(outputStream* st, const char* c = NULL) const;