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comparison src/share/vm/gc_implementation/g1/g1BiasedArray.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 a19bea467577
children 78bbf4d43a14
comparison
equal deleted inserted replaced
17759:bc22cbb8b45a 17760:5479cb006184
23 */ 23 */
24 24
25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1BIASEDARRAY_HPP 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1BIASEDARRAY_HPP
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1BIASEDARRAY_HPP 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1BIASEDARRAY_HPP
27 27
28 #include "memory/allocation.hpp"
28 #include "utilities/debug.hpp" 29 #include "utilities/debug.hpp"
29 #include "memory/allocation.inline.hpp"
30 30
31 // Implements the common base functionality for arrays that contain provisions 31 // Implements the common base functionality for arrays that contain provisions
32 // for accessing its elements using a biased index. 32 // for accessing its elements using a biased index.
33 // The element type is defined by the instantiating the template. 33 // The element type is defined by the instantiating the template.
34 class G1BiasedMappedArrayBase VALUE_OBJ_CLASS_SPEC { 34 class G1BiasedMappedArrayBase VALUE_OBJ_CLASS_SPEC {
46 46
47 G1BiasedMappedArrayBase() : _base(NULL), _length(0), _biased_base(NULL), 47 G1BiasedMappedArrayBase() : _base(NULL), _length(0), _biased_base(NULL),
48 _bias(0), _shift_by(0) { } 48 _bias(0), _shift_by(0) { }
49 49
50 // Allocate a new array, generic version. 50 // Allocate a new array, generic version.
51 static address create_new_base_array(size_t length, size_t elem_size) { 51 static address create_new_base_array(size_t length, size_t elem_size);
52 assert(length > 0, "just checking");
53 assert(elem_size > 0, "just checking");
54 return NEW_C_HEAP_ARRAY(u_char, length * elem_size, mtGC);
55 }
56 52
57 // Initialize the members of this class. The biased start address of this array 53 // Initialize the members of this class. The biased start address of this array
58 // is the bias (in elements) multiplied by the element size. 54 // is the bias (in elements) multiplied by the element size.
59 void initialize_base(address base, size_t length, size_t bias, size_t elem_size, uint shift_by) { 55 void initialize_base(address base, size_t length, size_t bias, size_t elem_size, uint shift_by) {
60 assert(base != NULL, "just checking"); 56 assert(base != NULL, "just checking");