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6962947: shared TaskQueue statistics

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Reviewed-by: tonyp, ysr
This commit is contained in:
John Coomes 2010-07-16 21:33:21 -07:00
parent 4efdcb87d1
commit daf491a814
11 changed files with 236 additions and 137 deletions
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31
hotspot/src/share/vm/utilities/globalDefinitions.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -345,6 +345,35 @@ inline intptr_t align_object_offset(intptr_t offset) {
return align_size_up(offset, HeapWordsPerLong);
}
// 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