diff options
Diffstat (limited to 'src/share/vm/gc_implementation/shared/gcUtil.hpp')
| -rw-r--r-- | src/share/vm/gc_implementation/shared/gcUtil.hpp | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/src/share/vm/gc_implementation/shared/gcUtil.hpp b/src/share/vm/gc_implementation/shared/gcUtil.hpp index 8dd3258de..86daba64c 100644 --- a/src/share/vm/gc_implementation/shared/gcUtil.hpp +++ b/src/share/vm/gc_implementation/shared/gcUtil.hpp @@ -50,11 +50,20 @@ class AdaptiveWeightedAverage : public CHeapObj { unsigned _weight; // The weight used to smooth the averages // A higher weight favors the most // recent data. + bool _is_old; // Has enough historical data + + const static unsigned OLD_THRESHOLD = 100; protected: float _last_sample; // The last value sampled. - void increment_count() { _sample_count++; } + void increment_count() { + _sample_count++; + if (!_is_old && _sample_count > OLD_THRESHOLD) { + _is_old = true; + } + } + void set_average(float avg) { _average = avg; } // Helper function, computes an adaptive weighted average @@ -64,13 +73,15 @@ class AdaptiveWeightedAverage : public CHeapObj { public: // Input weight must be between 0 and 100 AdaptiveWeightedAverage(unsigned weight, float avg = 0.0) : - _average(avg), _sample_count(0), _weight(weight), _last_sample(0.0) { + _average(avg), _sample_count(0), _weight(weight), _last_sample(0.0), + _is_old(false) { } void clear() { _average = 0; _sample_count = 0; _last_sample = 0; + _is_old = false; } // Useful for modifying static structures after startup. @@ -84,7 +95,8 @@ class AdaptiveWeightedAverage : public CHeapObj { float average() const { return _average; } unsigned weight() const { return _weight; } unsigned count() const { return _sample_count; } - float last_sample() const { return _last_sample; } + float last_sample() const { return _last_sample; } + bool is_old() const { return _is_old; } // Update data with a new sample. void sample(float new_sample); |