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comparison src/share/vm/utilities/globalDefinitions.hpp @ 1665:a93a9eda13f7

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6962947: shared TaskQueue statistics Reviewed-by: tonyp, ysr
author jcoomes
date Fri, 16 Jul 2010 21:33:21 -0700
parents e9ff18c4ace7
children d6f45b55c972
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1657:1a1ce2076047 1665:a93a9eda13f7
1 /* 1 /*
2 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
343 343
344 inline intptr_t align_object_offset(intptr_t offset) { 344 inline intptr_t align_object_offset(intptr_t offset) {
345 return align_size_up(offset, HeapWordsPerLong); 345 return align_size_up(offset, HeapWordsPerLong);
346 } 346 }
347 347
348 // The expected size in bytes of a cache line, used to pad data structures.
349 #define DEFAULT_CACHE_LINE_SIZE 64
350
351 // Bytes needed to pad type to avoid cache-line sharing; alignment should be the
352 // expected cache line size (a power of two). The first addend avoids sharing
353 // when the start address is not a multiple of alignment; the second maintains
354 // alignment of starting addresses that happen to be a multiple.
355 #define PADDING_SIZE(type, alignment) \
356 ((alignment) + align_size_up_(sizeof(type), alignment))
357
358 // Templates to create a subclass padded to avoid cache line sharing. These are
359 // effective only when applied to derived-most (leaf) classes.
360
361 // When no args are passed to the base ctor.
362 template <class T, size_t alignment = DEFAULT_CACHE_LINE_SIZE>
363 class Padded: public T {
364 private:
365 char _pad_buf_[PADDING_SIZE(T, alignment)];
366 };
367
368 // When either 0 or 1 args may be passed to the base ctor.
369 template <class T, typename Arg1T, size_t alignment = DEFAULT_CACHE_LINE_SIZE>
370 class Padded01: public T {
371 public:
372 Padded01(): T() { }
373 Padded01(Arg1T arg1): T(arg1) { }
374 private:
375 char _pad_buf_[PADDING_SIZE(T, alignment)];
376 };
348 377
349 //---------------------------------------------------------------------------------------------------- 378 //----------------------------------------------------------------------------------------------------
350 // Utility macros for compilers 379 // Utility macros for compilers
351 // used to silence compiler warnings 380 // used to silence compiler warnings
352 381