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comparison src/share/vm/memory/padded.hpp @ 17760:5479cb006184

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8036860: Pad and cache-align the BiasedMappedArray Summary: Pad and cache-align BiasedMappedArray instances by default to avoid performance variability problems due to false sharing, as instances of this data structures are typically used for performance sensitive code. Reviewed-by: brutisso, stefank
author tschatzl
date Mon, 24 Mar 2014 15:31:00 +0100
parents d7070f371770
children
comparison
equal deleted inserted replaced
17759:bc22cbb8b45a 17760:5479cb006184
99 // Creates an aligned padded 2D array. 99 // Creates an aligned padded 2D array.
100 // The memory cannot be deleted since the raw memory chunk is not returned. 100 // The memory cannot be deleted since the raw memory chunk is not returned.
101 static T** create_unfreeable(uint rows, uint columns, size_t* allocation_size = NULL); 101 static T** create_unfreeable(uint rows, uint columns, size_t* allocation_size = NULL);
102 }; 102 };
103 103
104 // Helper class to create an array of T objects. The array as a whole will
105 // start at a multiple of alignment and its size will be aligned to alignment.
106 template <class T, MEMFLAGS flags, size_t alignment = DEFAULT_CACHE_LINE_SIZE>
107 class PaddedPrimitiveArray {
108 public:
109 static T* create_unfreeable(size_t length);
110 };
111
104 #endif // SHARE_VM_MEMORY_PADDED_HPP 112 #endif // SHARE_VM_MEMORY_PADDED_HPP