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8166848: Performance bug: SystemDictionary - optimization

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Check instead that a bucket isn't 10x the average

Reviewed-by: iklam, gziemski, sspitsyn
This commit is contained in:
Coleen Phillimore 2017-05-18 08:17:52 -04:00
parent 553d1e815b
commit f820e2f2ee
9 changed files with 55 additions and 191 deletions
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26
hotspot/src/share/vm/utilities/hashtable.hpp
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@ -124,17 +124,9 @@ private:
// Instance variable
BasicHashtableEntry<F>* _entry;
#ifdef ASSERT
private:
unsigned _hits;
public:
unsigned hits() { return _hits; }
void count_hit() { _hits++; }
#endif
public:
// Accessing
void clear() { _entry = NULL; DEBUG_ONLY(_hits = 0); }
void clear() { _entry = NULL; }
// The following methods use order access methods to avoid race
// conditions in multiprocessor systems.
@ -179,10 +171,7 @@ private:
protected:
#ifdef ASSERT
bool _lookup_warning;
mutable int _lookup_count;
mutable int _lookup_length;
bool verify_lookup_length(double load, const char *table_name);
void verify_lookup_length(int max_bucket_count, const char *table_name);
#endif
void initialize(int table_size, int entry_size, int number_of_entries);
@ -232,16 +221,7 @@ public:
int number_of_entries() { return _number_of_entries; }
void verify() PRODUCT_RETURN;
#ifdef ASSERT
void bucket_count_hit(int i) const {
_buckets[i].count_hit();
}
unsigned bucket_hits(int i) const {
return _buckets[i].hits();
}
#endif
template <class T> void verify_table(const char* table_name) PRODUCT_RETURN;
};