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8022880: False sharing between PSPromotionManager instances

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Pad the PSPromotionManager instances in the manager array.

Reviewed-by: brutisso, jmasa
This commit is contained in:
Stefan Karlsson 2013-05-31 14:32:44 +02:00
parent 7cea3820af
commit 70f22c649b
10 changed files with 189 additions and 47 deletions
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32
hotspot/src/share/vm/utilities/globalDefinitions.hpp
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@ -410,6 +410,8 @@ inline intptr_t align_size_down(intptr_t size, intptr_t alignment) {
return align_size_down_(size, alignment);
}
#define is_size_aligned_(size, alignment) ((size) == (align_size_up_(size, alignment)))
// Align objects by rounding up their size, in HeapWord units.
#define align_object_size_(size) align_size_up_(size, MinObjAlignment)
@ -428,6 +430,10 @@ inline intptr_t align_object_offset(intptr_t offset) {
return align_size_up(offset, HeapWordsPerLong);
}
inline void* align_pointer_up(const void* addr, size_t size) {
return (void*) align_size_up_((uintptr_t)addr, size);
}
// Clamp an address to be within a specific page
// 1. If addr is on the page it is returned as is
// 2. If addr is above the page_address the start of the *next* page will be returned
@ -449,32 +455,6 @@ inline address clamp_address_in_page(address addr, address page_address, intptr_
// The expected size in bytes of a cache line, used to pad data structures.
#define DEFAULT_CACHE_LINE_SIZE 64
// Bytes needed to pad type to avoid cache-line sharing; alignment should be the
// expected cache line size (a power of two). The first addend avoids sharing
// when the start address is not a multiple of alignment; the second maintains
// alignment of starting addresses that happen to be a multiple.
#define PADDING_SIZE(type, alignment) \
((alignment) + align_size_up_(sizeof(type), alignment))
// Templates to create a subclass padded to avoid cache line sharing. These are
// effective only when applied to derived-most (leaf) classes.
// When no args are passed to the base ctor.
template <class T, size_t alignment = DEFAULT_CACHE_LINE_SIZE>
class Padded: public T {
private:
char _pad_buf_[PADDING_SIZE(T, alignment)];
};
// When either 0 or 1 args may be passed to the base ctor.
template <class T, typename Arg1T, size_t alignment = DEFAULT_CACHE_LINE_SIZE>
class Padded01: public T {
public:
Padded01(): T() { }
Padded01(Arg1T arg1): T(arg1) { }
private:
char _pad_buf_[PADDING_SIZE(T, alignment)];
};
//----------------------------------------------------------------------------------------------------
// Utility macros for compilers