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7079329: Adjust allocation prefetching for T4

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On T4 2 BIS instructions should be issued to prefetch 64 bytes

Reviewed-by: iveresov, phh, twisti
This commit is contained in:
Vladimir Kozlov 2011-08-16 16:59:46 -07:00
parent 080f790edc
commit 90651b2666
18 changed files with 299 additions and 129 deletions
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7
hotspot/src/share/vm/runtime/vm_version.hpp
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@ -44,6 +44,7 @@ class Abstract_VM_Version: AllStatic {
static bool _initialized;
static int _parallel_worker_threads;
static bool _parallel_worker_threads_initialized;
static int _reserve_for_allocation_prefetch;
static unsigned int nof_parallel_worker_threads(unsigned int num,
unsigned int dem,
@ -77,6 +78,12 @@ class Abstract_VM_Version: AllStatic {
return _logical_processors_per_package;
}
// Need a space at the end of TLAB for prefetch instructions
// which may fault when accessing memory outside of heap.
static int reserve_for_allocation_prefetch() {
return _reserve_for_allocation_prefetch;
}
// ARCH specific policy for the BiasedLocking
static bool use_biased_locking() { return true; }