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8036860: Pad and cache-align the BiasedMappedArray

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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
This commit is contained in:
Thomas Schatzl 2014-03-17 13:07:55 +01:00
parent 483ea400a5
commit a07b2194f7
4 changed files with 28 additions and 6 deletions
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8
hotspot/src/share/vm/gc_implementation/g1/g1BiasedArray.cpp
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@ -24,6 +24,14 @@
#include "precompiled.hpp"
#include "gc_implementation/g1/g1BiasedArray.hpp"
#include "memory/padded.inline.hpp"
// Allocate a new array, generic version.
address G1BiasedMappedArrayBase::create_new_base_array(size_t length, size_t elem_size) {
assert(length > 0, "just checking");
assert(elem_size > 0, "just checking");
return PaddedPrimitiveArray<u_char, mtGC>::create_unfreeable(length * elem_size);
}
#ifndef PRODUCT
void G1BiasedMappedArrayBase::verify_index(idx_t index) const {