Mercurial > hg > truffle
diff src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.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 | 05f89f00a864 |
| children | 0bfd3fb24150 |
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--- a/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp Wed Dec 16 15:12:51 2009 -0800 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp Wed Dec 23 09:23:54 2009 -0800 @@ -355,6 +355,11 @@ unsigned int new_duty_cycle); unsigned int icms_update_duty_cycle_impl(); + // In support of adjusting of cms trigger ratios based on history + // of concurrent mode failure. + double cms_free_adjustment_factor(size_t free) const; + void adjust_cms_free_adjustment_factor(bool fail, size_t free); + public: CMSStats(ConcurrentMarkSweepGeneration* cms_gen, unsigned int alpha = CMSExpAvgFactor); @@ -570,8 +575,11 @@ // appropriately. void check_gc_time_limit(); // XXX Move these to CMSStats ??? FIX ME !!! - elapsedTimer _sweep_timer; - AdaptivePaddedAverage _sweep_estimate; + elapsedTimer _inter_sweep_timer; // time between sweeps + elapsedTimer _intra_sweep_timer; // time _in_ sweeps + // padded decaying average estimates of the above + AdaptivePaddedAverage _inter_sweep_estimate; + AdaptivePaddedAverage _intra_sweep_estimate; protected: ConcurrentMarkSweepGeneration* _cmsGen; // old gen (CMS) @@ -625,6 +633,7 @@ // . _collectorState <= Idling == post-sweep && pre-mark // . _collectorState in (Idling, Sweeping) == {initial,final}marking || // precleaning || abortablePrecleanb + public: enum CollectorState { Resizing = 0, Resetting = 1, @@ -636,6 +645,7 @@ FinalMarking = 7, Sweeping = 8 }; + protected: static CollectorState _collectorState; // State related to prologue/epilogue invocation for my generations @@ -655,7 +665,7 @@ int _numYields; size_t _numDirtyCards; - uint _sweepCount; + size_t _sweep_count; // number of full gc's since the last concurrent gc. uint _full_gcs_since_conc_gc; @@ -905,7 +915,7 @@ // Check that the currently executing thread is the expected // one (foreground collector or background collector). - void check_correct_thread_executing() PRODUCT_RETURN; + static void check_correct_thread_executing() PRODUCT_RETURN; // XXXPERM void print_statistics() PRODUCT_RETURN; bool is_cms_reachable(HeapWord* addr); @@ -930,8 +940,8 @@ static void set_foregroundGCShouldWait(bool v) { _foregroundGCShouldWait = v; } static bool foregroundGCIsActive() { return _foregroundGCIsActive; } static void set_foregroundGCIsActive(bool v) { _foregroundGCIsActive = v; } - uint sweepCount() const { return _sweepCount; } - void incrementSweepCount() { _sweepCount++; } + size_t sweep_count() const { return _sweep_count; } + void increment_sweep_count() { _sweep_count++; } // Timers/stats for gc scheduling and incremental mode pacing. CMSStats& stats() { return _stats; } @@ -1165,6 +1175,11 @@ virtual bool promotion_attempt_is_safe(size_t promotion_in_bytes, bool younger_handles_promotion_failure) const; + // Inform this (non-young) generation that a promotion failure was + // encountered during a collection of a younger generation that + // promotes into this generation. + virtual void promotion_failure_occurred(); + bool should_collect(bool full, size_t size, bool tlab); virtual bool should_concurrent_collect() const; virtual bool is_too_full() const;